We investigate the tectonic evolution of the Wetterstein and Mieming mountains in the western Northern Calcareous Alps (NCA) of the European Eastern Alps. In-sequence NW-directed stacking of thrust sheets in this thin-skinned foreland thrust belt lasted from the Hauterivian to the Cenomanian. In the more internal NCA major E-striking intracontinental transform faults dissected the thrust belt at the Albian–Cenomanian boundary that facilitated ascent of mantle melts feeding basanitic dykes and sills. Afterwards, the NCA basement was subducted, and the NCA were transported piggy-back across the tectonically deeper Penninic units. This process was accompanied by renewed Late Cretaceous NW-directed thrusting, and folding of thrusts. During Paleogene collision, N(NE)-directed out-of-sequence thrusts developed that offset the in-sequence thrust. We use this latter observation to revise the existing tectonic subdivision of the western NCA, in which these out-of-sequence thrusts had been used to delimit nappes, locally with young-on-old contacts at the base. We define new units that represent thrust sheets having exclusively old-on-young contacts at their base. Two large thrust sheets build the western NCA: (1) the tectonically deeper Tannheim thrust sheet and (2) the tectonically higher Karwendel thrust sheet. West of the Wetterstein and Mieming mountains, the Imst part of the Karwendel thrust sheet is stacked by an out-of-sequence thrust onto the main body of the Karwendel thrust sheet, which is, in its southeastern part, in lateral contact with the latter across a tear fault.
The NCA are the most northern and external part of the far-travelled Austroalpine nappe system of the Eastern Alps, and are a typical thin-skinned fold-and-thrust belt (e.g., Linzer et al. 1995; Eisbacher and Brandner 1996; Schmid et al. 2004). The NCA thrust sheets and nappes were stacked and emplaced on tectonically deeper units mainly during the Cretaceous (see “Structural evolution of the NCA”). In three seminal papers Hahn (1912, 1913a, b) subdivided the NCA from external to internal and base to top into the Bajuvaric, Tirolic, and Juvavic nappe systems (Fig. 1). He also described the different Triassic facies within these nappe systems: the Bajuvaric nappes have the smallest sedimentary thicknesses, dominantly shallow marine facies, and local clastic intercalations in the carbonate-dominated successions. The maximum sedimentary thickness is found in the entirely carbonatic shallow marine successions of the Tirolic nappe system. The Juvavic nappe system has two different parts: (i) Sedimentary facies within the Lower Juvavic units varies from pelagic limestones (Hallstatt facies) to forereef and reef facies (Hahn 1913b; Gawlick et al. 1999; Mandl 2000; Frisch and Gawlick 2003). The Lower Juvavic units represent swarms of slides initially emplaced in the Late Jurassic that were covered by younger deposits and locally remobilized during Cretaceous thrusting (Tollmann 1987; Mandl 2000; Gawlick and Missoni 2015). The (ii) Upper Juvavic nappes have the same carbonatic shallow marine successions as the Tirolic nappe system. Only in the 1980s, it was understood that these facies zones were part of a south-facing passive continental margin and represent the transition from the inner continental margin to the continental slope (Fig. 1) that was stacked during Alpine orogeny (Brandner 1984; Lein 1987; Haas et al. 1995; Mandl 2000). In the western NCA; however, facies boundaries turn toward a N–S direction (Fig. 1b), and all units stacked have the same facies of an inner continental margin (Bechstädt and Mostler 1976; Tollmann 1976a; Haas et al. 1995).
Based on the work of Ampferer and Hammer (1911) and Ampferer (1912), the western NCA have been subdivided into three major thrust sheets (Figs. 2, 3b): These are, from base to top, the (1) Allgäu thrust sheet, forming a narrow band at the northern margin of the NCA, except in the far west, the (2) Lechtal thrust sheet, representing the main body of the western NCA, and the (3) Inntal thrust sheet in the south-central part of the NCA of Tirol (Heißel 1958; Tollmann 1970b, 1976b; Eisbacher and Brandner 1996). Even more external than the Allgäu thrust sheet, a narrow, discontinuous marginal slice named the “Cenoman-Randschuppe” (CRS) is present (Figs. 2, 3) that accompanies the NCA over much of its length (Tollmann 1970b; Müller 1973). On top of the Inntal thrust sheet, the Krabachjoch thrust sheet is preserved in isolated klippen between Lech and Imst (Fig. 2) (Ampferer 1914b). Even if the sedimentary succession of the Inntal- and Krabachjoch thrust sheets is similar to the underlying Lechtal thrust sheet, these have been regarded to be part of the Tirolic nappe system, while the CRS, the Lechtal- and Allgäu thrust sheets have been interpreted as a part of the Bajuvaric nappe system (Hahn 1913a; Tollmann 1976b).
One of the key problems that the early mappers encountered was the structural ambiguity in the Karwendel, Wetterstein and Mieming mountains in Bavaria and Tirol (see Fig. 2 for location). As a consequence, a long-lasting controversy regarding the existence or non-existence of the Inntal thrust sheet developed. One group of researchers insisted on the structural continuity between Lechtal and Inntal thrust sheets that both emplace Triassic carbonates onto Cretaceous marls, and rejected the existence of an Inntal thrust sheet (Fig. 3a). Another group emphasized the stratigraphic connection of the Wetterstein mountains with their northeastern foreland (Fig. 2), and thus separated Lechtal and Inntal thrust sheets (Fig. 3a) (see Schneider 1962 and “The controversy”).
Based on the structural analysis of macro- and mesostructures in the Mieming and Wetterstein mountains, we show in this contribution that the observations of both groups of researchers were correct. The problem can be solved when the old-on-young criterion for the emplacement of thrust sheets is strictly followed, and thus young-on-old contacts with reverse kinematics that are observed locally at the base of the Inntal thrust sheet, are considered to be out-of-sequence thrusts. If out-of-sequence thrusts have not enough offset, they cannot be used for the separation of major tectonic units, as they often terminate laterally, and dissect thrust sheets that already exist. As a consequence, the thrust sheets need to be reorganized, and we propose a new tectonic subdivision of the western NCA, following an earlier publication on this subject by Kilian and Ortner (2019). We discard the names used by Ampferer (1912) and introduce new names to define thrust sheets that are entirely floored by synorogenic sediments on top of the tectonically deeper unit. Doing this, we connect thrust sheets being part of different thrust systems, and the thrust systems of the western NCA have to be redefined as well.
The Permo-Triassic part of the sedimentary succession building the western NCA thrust sheets was deposited on the SE passive margin of Pangea located west and north of the westward closing end of the Neotethys ocean (Fig. 1b) (e.g., Lein 1987; Haas et al. 1995). We use names of stratigraphic units according to the Austrian stratigraphic chart (Piller et al. 2004) The succession starts with Permian continental clastics (Alpine Verrucano) (Stingl 1982, 1984), interfingering with salt-bearing evaporites and shales (Haselgebirge) (Spötl 1988, 1989; Leitner and Spötl 2017), followed by Lower Triassic evaporites and dolomites of the Reichenhall Formation (e.g., Schenk 1967). Haselgebirge and Reichenhall Formation form the basal décollement of the NCA (Linzer et al. 1995; Eisbacher and Brandner 1996). The Haselgebirge salt has important consequences for the geometry and thicknesses of the younger deposits, and salt tectonics have only recently been recognized in the NCA (Granado et al. 2018; Fernández et al. 2020; Strauss et al. 2021). Well bedded limestones of the Virgloria and Steinalm Formations are the first basinal and carbonate ramp deposits of the area (Bechstädt and Mostler 1976), and form, together with the Reifling Formation, the Alpine Muschelkalk Group (Bechstädt and Mostler 1974). Breakup of the Steinalm ramp caused facies heteropy in the Middle Triassic, when the basinal Reifling Formation interfingered with the Wetterstein limestone (Bechstädt and Mostler 1976), the latter representing the first major carbonate platform of the NCA, more than 1400 m thick at Zugspitze (Z of Fig. 2; Ortner 2015) and in the Mieming mountains (MM of Fig. 2; Miller 1965). In the Ladinian to Carnian, the younger part of the Wetterstein platform interfingers with the marly Partnach beds. Later in the Carnian, the mixed carbonatic–siliziclastic succession of the Raibl beds ends growth of the Wetterstein platform, and covers the platforms and interplatform basins (Brandner 1984). A new carbonate platform develops in the Norian, and the more than 1000 m thick Hauptdolomit is deposited (Fruth and Scherreiks 1982, 1984). Toward the end of the Norian, this platform started to break apart, and the basins of the Kössen Formation developed in the Rhätian that interfinger with another platform, the Upper Rhätian limestone (Golebiowski 1991).
The Jurassic sedimentary succession of the NCA is controlled by rifting and opening of the Piemont–Liguria ocean that separated the African continent and the Adriatic microcontinent from Europe (Froitzheim and Manatschal 1996; Manatschal 2004). The syn-rift succession in the studied part of the NCA includes red nodular limestones of the Adnet Formation that accumulated on deep, submarine highs and are meters to tens of meters thick, and the basinal Allgäu Formation with spiculitic, siliceous limestones and occasional breccias and olistoliths (Jacobshagen 1965; Bischof et al. 2010), with thicknesses of hundreds of meters. After breakup in the Late Jurassic, the Ruhpolding radiolarite and the pelagic limestones of the Ammergau Formation accumulated, the latter reaching into the Early Cretaceous (Miller 1963c).
Synorogenic sedimentation started diachronously in the Early Cretaceous, with deposition of the marly Schrambach Formation that contains quartz-bearing calcarenites in its youngest part. According to Vidal (1953) and Miller (1963c) it reaches from the Berriasian at least into the Hauterivian. No younger deposits are known in the study area, but basanitic volcanic dykes and sills are found within the Jurassic–Cretaceous units between the Wetterstein and Mieming mountains that have been given the local name Ehrwaldites (Pichler 1866). These volcanites have been radiometrically dated at 100 Ma (99.4 ± 2; Albian–Cenomanian boundary; Trommsdorff et al. 1990).
Structural evolution of the NCA
In the Late Jurassic, Neotethys ophiolites were obducted onto the passive margin of the NCA (Gawlick et al. 1999; Schmid et al. 2004). These ophiolites are not exposed in the NCA, however, reworked ophiolitic detritus is widespread in Cretaceous synorogenic formations and has been related to Cretaceous erosion of the ophiolites (e.g., Pober and Faupl 1988; Schuster et al. 2007; Stern and Wagreich 2013). The obduction event was associated with imbrication and uplift of the distal continental margin, gravitative mobilization of units and emplacement of swarms of slides onto the more internal continental margin (Tollmann 1987; Mandl 2000; Frisch and Gawlick 2003). This sliding established the original superposition of the Lower Juvavic units onto the Tirolic nappe system, even if parts of the Juvavic nappe system were displaced in the Lower Cretaceous (see below; Mandl 2000). No direct evidence of these Jurassic processes has been documented in the western NCA.
Nappe stacking in the NCA of western Austria and southern Germany is closely related to Cretaceous syntectonic sedimentation. Inversion of the continental margin took place during Cretaceous intracontinental subduction within the Adriatic plate (Janák et al. 2004; Stüwe and Schuster 2010). Shortening caused NW-directed stacking of thrust sheets in the NCA, involving tens of kilometers of shortening (Eisbacher et al. 1990; Linzer et al. 1995; Eisbacher and Brandner 1996). The age of syntectonic sediments below a thrust sheet allows to define a maximum age of emplacement, while synorogenic clastics unconformably overlying the exhumed thrust sheet give a minimum age (upper-footwall deposits and thrust-sheet-top deposits of Ortner 2003a; Ortner and Gaupp 2007; Ortner 2016; see Figs. 2, 4a, b). The ages of upper-footwall deposits suggest thrust sheet emplacement between the Hauterivian and Turonian. Unfortunately, these ages were not known or not considered at the time when the thrust sheets were defined, and several thrust sheets rest on sediments of different age (numbers with references indicate locations of Fig. 2, color coding in Fig. 4c gives thrust age).
The western tip of the Inntal thrust sheet overlies Cenomanian shales and sandstones (Lech Formation; 1—Huckriede 1958; 2—Helmcke and Pflaumann 1971; 3—Leiss 1988), while the Inntal thrust sheet of the Mieming and Karwendel mountains rests on Hauterivian shales and sandstones (Schrambach Formation; 4Miller 1963c; Morlok 1987). The eastern tip of the Inntal thrust sheet overlies Turonian–Coniacian thrust-sheet-top deposits of the Gosau Group (15—Sanders 1996).
The Lechtal thrust sheet of the Wetterstein mountains overlies Hauterivian shales and sandstones (Schrambach Formation; 5—Vidal 1953). However, at the northern margin of the NCA the Lechtal thrust sheet overthrusts Albian shales and sandstones (Losenstein Formation; 6—Zacher 1966; 9—Höfle et al. 1969; 7—Risch 1971; 8—Gaupp 1982). Cenomanian thrust sheet-top deposits unconformably overlie the external Lechtal thrust sheet (Branderfleck Formation; 10—Gaupp 1982; Weidich 1984). West of the Arlberg, the Lechtal thrust sheet is emplaced onto Turonian–Coniacian (12Schidlowski 1962; Winkler 1988) or even Coniacian–Santonian (12—Leiss 1992) shales and conglomerates of the Lech Formation. East of the Inn valley, it overlies Turonian deposits (Branderfleck Formation; 14—Zeil 1955; Ganss 1967; Doben 1970).
In the CRS, upper-footwall deposits and thrust-sheet-top deposits are found in one continuous sedimentary succession (11—Gaupp 1982; 13—Doben 1985). Therefore, the position of the northern tip of the Lechtal thrust sheet in the Cenomanian was south of the CRS, which was, at that time, also the northern, external tip of the thrust belt at the transition to a foreland basin (Fig. 4a) (Gaupp 1983; Sieberer and Ortner 2018). The Allgäu thrust sheet was emplaced onto Turonian thrust-sheet-top deposits of the CRS (Branderfleck Formation; 11—Gaupp 1982; Weidich 1984; 13—Doben 1985).
Thrust sheet emplacement was generally not accompanied by major folding. From the Cenomanian–Turonian onward, when the external NCA had lost their crystalline basement (e.g., Oberhauser 1995; Faupl and Wagreich 2000; Handy et al. 2010) and subduction of the Piemont–Liguria ocean had begun, the NCA travelled across the tectonically deeper Penninic units (Frisch 1979; Winkler 1988; Froitzheim et al. 1996; von Eynatten and Gaupp 1999). The major thrusts were folded (the "Deckenfaltung" = refolding of nappes of Kockel 1926), which is recorded in the growth strata of the thrust-sheet-top deposits (Branderfleck Formation and Gosau Group; Ortner 2001, 2007; Ortner and Gaupp 2007; Sommer et al. 2010; Ortner et al. 2016; Sieberer 2020; Fig. 4b). This shortening persisted into the Paleogene and progressively changed toward a N- and NNE direction in the Paleogene (Eisbacher and Brandner 1996), culminating in Late Eocene collision (e.g., Handy et al. 2010). This observation is in contrast to the tectonic evolution of the Austroalpine basement units, where Late Cretaceous stretching separates Cretaceous and Cenozoic shortening (Froitzheim et al. 1994; Neubauer et al. 1995; Fügenschuh et al. 2000). This event has not been observed in any of the more recent studies on the tectonic development of the NCA (May and Eisbacher 1999; Auer and Eisbacher 2003; Tanner et al. 2003; Behrmann and Tanner 2006; Kilian and Ortner 2019; Oswald et al. 2019; Kilian et al. 2021), except Froitzheim et al. (2012). During the Miocene, renewed NNE- to NE-directed shortening affected the NCA (Decker et al. 1994; Ortner 2003b) that was largely related to activity of strike–slip faults and contemporanous to postcollisional transport of the Alpine wedge into the Cenozoic foreland basin on the European margin (Ortner et al. 2015; Schuller et al. 2015).
The separation of the Inntal from the Lechtal thrust sheet was controversially discussed ever since the Inntal thrust sheet was defined by Ampferer (1912) both in the Karwendel mountains (see Kilian and Ortner 2019) and the Wetterstein and Mieming mountains (see Fig. 2) discussed here. Both the Wetterstein and Mieming mountains are built by the km-thick Wetterstein limestone and the underlying Muschelkalk Group, often floored by the evaporitic Reichenhall Formation. These Triassic rocks are emplaced onto Cretaceous marls of the Schrambach Formation (Fig. 5). One group argued that there is a continuous sedimentary succession connecting the northeastern foothills of the Wetterstein mountains (Fig. 2), which are clearly part of the Lechtal thrust sheet, with the Wetterstein mountains (Ampferer 1912, 1914a, 1931, 1942; Leuchs 1924, 1935; Beurlen 1944; Vidal 1953; Bögel 1960; Ferreiro Mählmann and Morlok 1992). According to this interpretation, major south-directed backthrusting within the Lechtal thrust sheet is required (Fig. 3a) (Zugspitze thrust of Mylius 1916; Miller 1963a, b; Eisbacher and Brandner 1995). Another group connected the Mieming and Zugspitze thrusts (see Fig. 3a) and interpreted the Lechtal thrust sheet to be continuous with the Inntal thrust sheet (Schlagintweit 1912a, b; Richter 1929; Haber 1934; Kraus 1957; Rüffer and Bechstädt 1995). However, these authors could not separate this allochthon from its northern foreland, where a sedimentary succession linking the two units is observed.
Kinematics of thrusts
When the tectonic subdivision of the NCA was defined at the start of the twentieth century, thrust kinematics were not yet properly understood. For the authors defining the nappes of the western NCA, the only requirement was to have thrusts on all sides (e.g., Ampferer 1914b, p. 319, 324; Heißel 1958, p. 128; Tollmann 1973, p. 8), and they used any thrust irrespective of its geometry or age. The latter two authors stated a thrust would more commonly emplace old on young rocks, but this was not considered to be mandatory. This led to a tectonic subdivision in which thrust sheets are bounded by thrusts of different age (compare Figs. 2, 4c).
It was only from the 1970s onward that key papers on the geometry and kinematics of thrusting were published (e.g., Elliott 1976; Boyer and Elliott 1982; Suppe 1983; Suppe and Medwedeff 1990) and these principles applied to the major thrusts of the western NCA (Eisbacher et al. 1990). It was known that thrusts have lateral terminations and grow laterally during foreland propagation while offset increases (Fig. 6a) (Elliott 1976). Thrusts will therefore cover (i) younger sediments in the direction of frontal and (ii) lateral propagation (Fig. 6b) (e.g., Davis et al. 2005; Mazzoli et al. 2005; Bergen and Shaw 2010). Lateral propagation of thrusts (iii) can cause neighbouring thrusts to merge that may have initiated at different times (Fig. 6c).
All these cases are observed within the western NCA: (i) The Lechtal thrust has an Albian age over much of its length but has a Hauterivian age where it reappears in a more internal position below the Zugspitze (1 of Fig. 4c). (ii) Its easternmost part has a Turonian age (2 of Fig. 4c). (iii) The Albian Lechtal thrust has its western tip NNE of Lech, where stratigraphic offset disappears (Figs. 2, 3 of Fig. 4c). Further west, a thrust of Coniacian age has its eastern tip. This observation shows that the Lechtal and underlying Allgäu thrust sheets are not completely separated (as already stated by Spengler 1953, p. 53; Richter 1956, p. 190; Hückel et al. 1961, plate 5; Trümpy 1969, p. 108). However, the Albian and the Coniacian thrusts have traditionally been connected (Ampferer 1914b; Tollmann 1970b).
We term thrusted units that are not completely separated from their footwall thrust sheets, and far-travelled allochthons nappes. In the NCA, only the units of the Juvavic nappe system are entirely separated, while the thrusts between units of the Bajuvaric and Tirolic nappe system tend to end laterally (e.g., 1 of Fig. 1a).
Thrusts in thrust belts typically propagate toward the foreland and downward (Boyer and Elliott 1982; Butler 1987; Morley 1988; Verges and Muñoz 1990). This is also the case within the western NCA, where the oldest, Hauterivian thrust transport is that of the uppermost large thrust sheet, and the youngest, Paleogene thrust is that of the lowermost thrust sheet onto Penninic units (Fig. 4c) (Mandl 2000; Ortner 2003a). We use the term out-of-sequence thrust for those faults that are outside this foreland-propagating sequence, and that often cut across older thrusts (compare Morley 1988; Verges and Muñoz 1990; McClay 1992).
Geometry might be complex when thrust boundaries get folded as new thrusts form in the footwall of an existing thrust during in-sequence thrust propagation. Folded thrusts are likely places where out-of-sequence thrusts form when shortening persists (e.g., Gilluly 1960; Boyer 1992).
Here we present the results of our structural investigation in the Mieming and Wetterstein mountains, based on the relative succession and cross-cutting relationships of structures. Section “Western and southern flank of the Wetterstein and Mieming mountains” establishes the regional nature of the Zugspitze and Mieming thrusts and its kinematics. Section “The zone of Upper Triassic to Lower Cretaceous rocks S of the Wetterstein mountains (Puitental Zone)” adds the timing of the Zugspitze thrust relative to E-trending strike–slip faults intruded by basanitic dykes and defines the Puitental Zone as a zone of backthrusting. Section “Mieming mountains and Vorbergzug” introduces the geology of the Mieming mountains and of the Höll shear zone as an important discontinuity. Section “Northern flank of the Wetterstein mountains” describes duplexing at the NW corner of Zugspitze. The duplex terminates against the Ehrwald branch of the Loisach fault in the West and passes into a zone of tight folding NW of Mittenwald where the Wetterstein carbonate platform interfingers with and is replaced by basinal marls.
Western and southern flank of the Wetterstein and Mieming mountains
The most prominent structures in the investigated area are the Mieming and Zugspitze thrusts (Fig. 5) that emplace Triassic carbonates onto marls of the synorogenic Schrambach Formation reaching into the Hauterivian (see “Sedimentary succession”). At outcrop scale, this thrust is parallel to bedding in the footwall (labels 3 and 9 of Fig. 5) in most places, but oblique to bedding in the hanging wall. The thrusts are associated with a shear zone with a thickness of several tens of meters, reaching downsection to the Kössen Formation, but not affecting the underlying competent Hauptdolomit. The thrusts are not continuously exposed, but well visible along the complete length of the western face of the Zugspitze (Fig. 5). Toward the E, numerous outcrops below the southern cliffs of the Wetterstein mountains (Leuchs 1930) indicate the regional nature of this contact (Fig. 5).
In an outcrop in the SE Mieming mountains at Marienbergjoch south of Ehrwald (label 9 of Fig. 5, Fig. 7b) top NW movements were recorded by NW-facing mesofolds in pelagic limestones of the Ammergau Formation, whereas the less competent, marly Allgäu and Schrambach Formations are deformed by NNE-facing mesofolds and s-c-fabrics (diagram 9 of Fig. 5) (van Kooten 2016). Isolated outcrops of the Jurassic–Cretaceous succession at the northwestern side of the Mieming mountains (label 10 of Fig. 5), and in mining galleries reaching from Schachtkopf under the western Mieming mountains (Schachtkopf mine of Fig. 5) (Ampferer and Ohnesorge 1924; Mutschlechner 1955) demonstrate the continuity of the Mieming thrust at the base of the Mieming mountains. The contact is seen to cut upsection continuously from the Reichenhall Formation in the South (above label 9 of Fig. 5) to the Raibl beds in the North (label IV of Fig. 5) at a rather constant angle of ca. 10° in the Mieming mountains. In the Wetterstein mountains, the thrust cuts from the Wetterstein limestone downsection into the Muschelkalk Group toward the North, and also to the East, giving the impression of a syncline truncated at the base with a maximum stratigraphic reduction above label 3 of Fig. 5.
The sedimentary succession in the footwall of the thrust below the western wall of the Zugspitze and the Mieming mountains is exposed from the Schrambach Formation down to the Kössen Formation (Fig. 5). At the SW corner of the Zugspitze, the succession is deformed into the hectometric, overturned, SSW-facing Holzerwies anticline (label 3 of Fig. 5). Adjacent to the south follows the symmetric, tight to isoclinal Koppenwald syncline with a vertical axial plane (label 4 of Fig. 5).
S–C structures, dm-scale vergent folds and brittle faults within the shear zone below the main thrust consistently show NW- to NE-directed transport of the hanging wall (Fig. 7). In a key outcrop below the Plattspitzen south face (Fig. 8; see Fig. 5 for location), dm-scale folds (Fig. 8c, g, f), s-c-fabrics (Fig. 8, label 2 of subfigure f) and the relationship between the main thrust and foliation in the underlying incompetent units (Fig. 8g, e) indicate NW-directed transport at the Zugspitze thrust.
The zone of Upper Triassic to Lower Cretaceous rocks S of the Wetterstein mountains (Puitental Zone)
The roughly E–W trending strip of Upper Triassic to Cretaceous rocks S of the cliffs of the Wetterstein mountains has been named the Puitental Zone (see Fig. 7a for location) by Tollmann (1976b). These cliffs are fault-controlled (Ampferer 1912; Leuchs 1930). Three sets of strike–slip faults can be observed: (1) a set of sinistral, E-trending faults (Puitental fault set), (2) a set of sinistral, NE-trending faults (Loisach fault set), and (3) a set of dextral, WNW-trending faults (Ammer fault set). The Loisach and Ammer fault sets are named following Kockel et al. (1931) and Schmidt-Thomé (1954). All of them offset the Zugspitze thrust in the area, and each other in the sequence described. Figures 9 and 10a give examples of the Puitental fault set: The thrust is vertically uplifted on the southern side of a sinistral strike–slip fault (see also Fig. 9c), the sinistral kinematics indicated by s–c fabrics (Fig. 10c) within Lower Cretaceous marls of the Schrambach Fm. The shear zone is intruded by Ehrwaldite dykes (Fig. 10b) that are found both along the s- and c-planes of the shear zone. Most probably the shear zone existed already and provided the anisotropy used by the dykes, but the dykes are also deformed by the shear zone. Otherwise we would expect to find Ehrwaldite dykes also in a oblique orientation with respect to the shear zone, being sheared only locally.
In map view, the rocks of the Puitental Zone were also involved in the sinistral shearing across NE-trending faults at their southern margin, but this margin does not seem to be involved in the dextral faulting (see above). The northern tips of 600–800 m wide fault blocks separated by sinistral strike–slip faults reach into the zone of tight folds, but most sinistral faults disappear within the folded zone or are connected to the SSW-directed Puitental backthrust (III of Figs. 5, 7, 9a), except the Gatterl fault that has 1 km offset (Ferreiro Mählmann and Morlok 1992). Thus, sinistral strike–slip faulting across the Loisach fault set, backthrusting and folding were contemporaneous.
Mieming mountains and Vorbergzug
The backbone of the Mieming mountains is the Mieming anticline, a simple, 40° E-plunging anticline N of Telfs (3 of Fig. 7a) (Mair 2020). Toward the West, the plunge diminishes to 25° (Leo 2020), and then disappears in the western Mieming mountains (diagram 6 of Fig. 5). Between Telfs and Ehrwald, the Mieming anticline has an axial plane dipping to the north (Becke 1983). The anticline is dissected by the NW-trending Telfs fault (T of Fig. 7b) that has a total offset of 5 km across its two branches. The western branch is connected to a steep oblique thrust that stacks the core of the anticline onto its northern limb (Miller 1963b; Becke 1983; Ferreiro Mählmann and Morlok 1992) and continues into its northern limb (label 11 of Fig. 5), but offset diminishes. Adjacent to the North is the open Gaistal–Hinterautal syncline (Fig. 5, 4 of Fig. 7a), and then the open anticline at Issentalköpfl (Figs. 5, 11a). This anticline disappears east of the Gatterl fault, only the northern limb of this anticline continues further to the East in the Vorbergzug (Figs. 5, 7a). Parts of the folds are cut out across E-trending faults that most probably belong to the sinistral Puitental fault set described in “The zone of Upper Triassic to Lower Cretaceous rocks S of the Wetterstein mountains (Puitental Zone)”. Like the Puitental Zone, the Mieming mountains are also dissected by 800 m spaced NE-trending sinistral faults that delimit structurally different units.
Toward the South, the Wetterstein limestone of the Mieming mountains is bounded by a major dextral strike slip fault that follows the shales and carbonates of the Raibl beds (Höll shear zone; H of Fig. 7b; diagram V of Fig. 5). This is a major break in the structural architecture in this part of the NCA: South of the Höll shear zone fold axes are uniformly SW–NE oriented (e.g., diagram 8 of Fig. 5) and terminate against the fault (Fig. 7). Fold axes N of this zone are parallel to the fault (diagrams 1–4 of Fig. 5). This applies for the Karwendel mountains as well (traces of fold axial planes 2, 3, 4 of Fig. 7a; see also Heißel 1978; Kilian and Ortner 2019; Kilian et al. 2021). NW of Telfs, the Höll shear zone is truncated by the Telfs fault (T of Fig. 7b) that also offsets the Mieming anticline and is part of the dextral Ammer fault set of “The zone of Upper Triassic to Lower Cretaceous rocks S of the Wetterstein mountains (Puitental Zone)”. Folds are more variably WNW–ESE to WSW–ENE oriented (diagrams 5–7 of Fig. 5) S of Ehrwald (Fig. 7).
Northern flank of the Wetterstein mountains
At the northern side of the Wetterstein mountains, stratigraphy and structure change. The Wetterstein carbonate platform interfingers to the NE with basinal sediments of the Reifling and Partnach Formations with clinoforms seen in the north flank of Zugspitze and Waxenstein (Petschick 1983; Hornung and Haas 2017) and is entirely replaced by these basinal deposits in the Mittenwald area (Ampferer 1912; Mylius 1916; Jerz and Ulrich 1966). A tightly folded continuous sedimentary succession is present from the Partnach beds to the Hauptdolomit, and therefore the Wetterstein mountains are in stratigraphic contact with their northern foreland (see “Structural evolution of the NCA”; Fig. 11b).
Further to the west, the units of the Alpine Muschelkalk Group are exposed below the Wetterstein limestone cliffs in the western part of the north face of the Zugspitze. At Ehrwalder Köpfe at the NW edge of the Wetterstein mountains, the Alpine Muschelkalk Group is stacked in a 500 m thick duplex with six slices (Obermoos thrusts; Fig. 12). Slice 2 is 220 m long between the synclinal hinge in the South (Fig. 12a) and the anticlinal hinge in the North (Fig. 12b) measured parallel to transport direction (diagram I of Fig. 5). Assuming a comparable length of all slices, a minimum offset of 1320 m is deduced. The floor and roof thrusts of this duplex emplaced strongly deformed Upper Triassic to Lower Cretaceous rocks between the Triassic units (Miller 1963a), and significantly larger transport has to be assumed. Slice 3 (Fig. 12a) is at least 800 m long, and the floor thrust in Fig. 11a has 7 km offset. Summing up, shortening in the duplex is about 9 km. Toward the east, the thickness and the number of slices of this duplex diminish (Fig. 12b).
The Jurassic succession associated with the floor thrust of the duplex is exposed at the SW shore of Eibsee (see Fig. 13 for location). An overturned succession of Schrambach to Kössen Fm., the latter in the core of a tight, recumbent fold, overlies the upright Hauptdolomit (Fig. 11a). An NNW-trending normal fault downthrows this succession to the Eibsee on its eastern side, but it is hidden below scree in the West. The Jurassic succession associated with the roof thrust is exposed in the northern Gamskar. A thin veneer of intensely sheared Jurassic rock (mostly Allgäu Formation) is found atop a thrust truncating the Virgloria and Steinalm Formations of the Alpine Muschelkalk (Fig. 12a, b). The thrust transports the hanging wall to the NNE (Fig. 5, diagrams I and II).
Figure 13 attempts a comprehensive view of the interdependent structures in 3D: In the northern foreland of the Wetterstein mountains, shortening increases significantly from E to W from a zone of tight folding in the NE, to a zone of duplexing at the NW side of the Zugspitze. Vertical uplift related to the W-ward increase of shortening causes the 30° eastward plunge of the folds above the duplex (e.g., Reintal syncline, Fig. 5, diagram 2) (Ortner 2015). This plunge is also associated with eastward tightening of the Reintal syncline and Zugspitze anticline from very open (see also Fig. 11a) at Zugspitze to tight east of Gatterl (see also Fig. 11b). Shortening is increasingly transferred from duplexing to folding toward the East, as the Wetterstein carbonate platform loses thickness and is replaced by the basinal Partnach marls.
The western boundary of this duplex is a branch of the Loisach fault set (Fig. 7). West of the Zugspitze, a branch of the Loisach fault set separates the Lermoos syncline with a km-thick Jurassic succession (Jacobshagen 1965; Köhler 1986) in the W from the easterly adjacent Ehrwald anticline where the Jurassic succession is condensed. Duplexing during activity of the Obermoos thrusts also ends against this Ehrwald branch of the Loisach fault set (Fig. 7).
Structural synthesis of the Wetterstein and Mieming mountains
Here we summarize the structural observations from the Wetterstein and Mieming mountains, and discuss the steps of deformation on a larger scale.
Across the Zugspitze and Mieming thrusts the hanging wall was probably detached in Permian Haselgebirge salt and transported to the NW (Figs. 2, 7b; kinematic data Mieming thrust: diagrams IV and 9 of Fig. 5; kinematic data Zugspitze thrust: Fig. 8). Based on the age of the youngest sediments below both thrusts (see “Sedimentary succession”), Cretaceous thrusting has a maximum age of Hauterivian in the Mieming and Wetterstein mountains. Based on the comparable age, structure and kinematics, we connect the Mieming and Zugspitze thrusts and thus the Lechtal and Inntal thrust sheets.
Ehrwaldites and E-trending sinistral Puitental faults
Offset of the Zugspitze and Mieming thrusts by sinistral E–W strike-slip faults is dated by the intrusion of the Albian Ehrwaldite dykes into one of the shear zones (Fig. 10). This is in accordance with the observation of Ehrwaldites in the Reichenhall Formation at the base of the overlying thrust sheet in the Karwendel mountains (Mutschlechner 1954; Trommsdorff 1962; Jerz and Ulrich 1966). Unlike previous studies that argued that the absence of the Ehrwaldite dykes and sills in the hanging wall of the thrusts means that thrusting had not yet taken place (e.g., Trommsdorff et al. 1990; Eisbacher and Brandner 1996), we conclude that the Ehrwaldites postdate major thrust motion. Otherwise the dykes and sills in the hanging wall would have been transported out of the area of observation.
In their study on the Ehrwaldites, Trommsdorff et al. (1990) argue that these were sourced from a subcontinental mantle, and exclude a subduction setting, i.e., the Penninic subduction underlying the NCA thrust sheets. The setting of the Ehrwaldites is compatible with a foreland setting of NCA nappe stacking in the foreland of Cretaceous intracontinental subduction (von Eynatten and Gaupp 1999; Ortner et al. 2006b, 2016). In such a setting, prior to onset of Penninic subduction, the NCA thrust belt was underlain by continental crust (Janák et al. 2004; Stüwe and Schuster 2010). The Allgäu thrust sheet and CRS had not yet formed and were part of a foreland basin beyond the tip of the Cretaceous orogenic wedge (Fig. 4b) (Gaupp 1982, 1983; Sieberer and Ortner 2018). In such a context, sinistral shearing at E-trending faults can probably be related to intracontinental transform faults in the context of eastward movement of the Iberian microplate relative to Europe (Handy et al. 2010). In paleogeographic reconstructions, such faults have been interpreted to crosscut the Austroalpine domain (e.g., Bechstädt 1978; Weissert and Bernoulli 1985; Channell et al. 1990; Froitzheim et al. 1996; Kövér et al. 2018; Le Breton et al. 2021), and Froitzheim et al. (1996) and Kövér et al. (2018) suggested a Cretaceous sinistral forerunner of the Cenozoic, dextral Periadriatic fault.
Field observations from different parts of the Austroalpine basement units have already documented such E- to NE-trending sinistral faults locally. These faults were active during or intermittent with Cretaceous nappe transport. These are (1) the Albula steep zone that affects the units of the Austroalpine–Penninic contact in Graubünden (Froitzheim et al. 1994), (2) the Gleinalm shear zone of eastern Austria that is connected to formation of the Gleinalm dome and subsidence of the Kainach Gosau basin (Neubauer et al. 1995).
Late Cretaceous out-of-sequence thrusting, folding, and the Höll shear zone
Ortner (2003a) recognized the out-of-sequence nature of the Cenomanian thrust flooring the western Inntal thrust sheet, which is younger than the more external thrust at the base of the Lechtal nappe (Fig. 4c). However, the eastern Inntal thrust sheet rests on Hauterivian deposits (Figs. 4c, 5). The WNW-striking, dextral Höll shear zone separates these two parts. The compression direction deduced from these faults (σ1 in diagram V of Fig. 5) is roughly perpendicular to fold axes of the western Inntal thrust sheet (e.g., Höllkopf syncline, diagram 8 of Fig. 5), supporting a kinematic connection between Cenomanian NW-transport of the western Inntal thrust sheet and dextral offset across the Höll shear zone. North of the Höll shear zone, folds have consistently ESE- to E-trending axes, pointing to a younger age of these folds. However, both the Höll shear zone and these folds are crosscut by both the Loisach and the Ammer fault sets (Figs. 7, 9). Considering relative ages, the Höll shear zone and the ESE- to E-trending folds are contemporaneous. If the kinematic connection between NW-transport of the western Inntal thrust sheet and the Höll shear zone is accepted, the ESE- to E-trending folds of the Wetterstein and Mieming mountains grew during the Upper Cretaceous, and the divergence of fold axis orientations can be explained by strain partitioning across the Höll shear zone as already suggested by Ortner and Bitterlich (2016) and Kilian et al. (2021). Growth of the NCA orogenic wedge by thrusting and folding only SW of the Höll shear zone would be difficult, as Cenomanian to Campanian (Weidich 1984) growth strata in synorogenic sediments N of the Wetterstein mountains (10 of Fig. 2) indicate fold growth throughout the Upper Cretaceous at the northern margin of the NCA (Fig. 4b; Ortner and Gaupp 2007; Sieberer 2020). Interpretation of the age of folding from fold axis orientations alone is therefore not possible in the western NCA.
Late Cretaceous to Paleogene out-of-sequence thrusting and the Loisach fault set
The vertical N-down km-scale offset across the sinistral Puitental fault set localized backthrusting across the Puitental backthrust by the connection of the Kössen marl décollement north and south of the sinistral faults with the decollement in the Raibl evaporites and shales (Fig. 11b). At least 2 km offset are seen in Fig. 11b, however this number may be underestimated as the Puitental backthrust is kinematically linked with the sinistral, NE-trending Gatterl fault of the Loisach fault set (see “The zone of Upper Triassic to Lower Cretaceous rocks S of the Wetterstein mountains (Puitental Zone)”), and the southern block moves out of the section.
The out-of-sequence Obermoos thrusts and the Puitental backthrust emplace young on old rocks and have up to 9 km offset that dies out toward the East. The footwall cutoff at the Obermoos thrusts must be below the rocks in the foreland of the Wetterstein mountains and should be at the base of the sedimentary succession of the Lechtal thrust sheet north of Zugspitze (Fig. 11). Therefore, the Wetterstein mountains must have been in continuation with the Lechtal thrust sheet, as previously claimed (see “The controversy”). However, connecting all footwall and hanging wall cutoffs across the Puitental backthrust implies also continuity of the Zugspitze and Mieming thrusts.
The N- to NNE-direction of transport across the out-of-sequence thrusts (diagrams I–III of Fig. 5) suggests a younger, Paleogene age as compared to initial Cretaceous NW-directed stacking. Accordingly, Eisbacher and Brandner (1996) related the Loisach fault set to Paleogene shortening and interpreted these faults as tear faults. Paleogene is roughly the age of collision in the Alps (see “Structural evolution of the NCA”), and it seems probable that out-of-sequence thrusting and the associated Loisach fault system is related to collision.
However, in the light of the discussion of “Late Cretaceous out-of-sequence thrusting, folding, and the Höll shear zone”, out-of-sequence thrusting, folding and activity of these tear faults might have started already during the Cretaceous. Such an interpretation is supported by the occurrence of the Loisach fault set only N of the Höll shear zone (Fig. 2). The Loisach fault set in northern part of the NCA extends into the Subalpine Molasse and must have a Miocene age (Figs. 2, 4c) (Schmidt-Thomé 1954; Ortner et al. 2015).
The NW-striking Telfs fault and parallel faults of the Ammer fault set are the youngest faults in the area, truncating all other faults. The Telfs faults is a NW continuation of the Brenner normal fault (BNF of Fig. 2), and has 5 km dextral offset in the area of Telfs (Fig. 7). Toward the NW close to the core of the Mieming anticline, the fault changes to a thrust and then ends (Miller 1963b; Becke 1983). Most of the offset seems to be consumed by tightening of the anticline. On the regional scale, the Ötztal nappe overthrusted the southernmost NCA in NW direction, delimited by the Telfs fault to the NE, while E–W stretching took place east of the Brenner fault (Ratschbacher et al. 1991). Activity of the Brenner normal fault is well-dated (e.g., Fügenschuh et al. 1997), and most probably, the Telfs fault and the Ammer fault set were active at the same time in the Middle Miocene.
Salt tectonics in the western NCA?
The geometry of the Mieming and Zugspitze thrusts remains enigmatic. While the geometry of the Mieming thrust in Fig. 5, cutting upsection, could be interpreted in terms of a hanging wall ramp in a fault-bend fold, the Zugspitze thrust cutting downsection in transport direction is much harder to explain. The geometry suggests that the thrust formed out-of-sequence and postdated folding of the hanging wall. However, the low angle of the cutoffs in the hanging wall is mechanically difficult to create. Known examples of out-of-sequence thrusts show that thrusts maintain their dip angle with respect to gravity if they are folded during activity, and create imbricate stacks in the forelimb of anticlines (Gilluly 1960; Boyer 1992). This is supported by evidence from numerical experiments (Fig. 14): in an already folded succession new faults form crosscutting a competent layer. Newly formed faults do not follow the anisotropy between layers 1 and 2 having a large rheological contrast at relatively low angle. Therefore, an origin of the Mieming–Zugspitze thrust as an out-of-sequence thrust is improbable.
An alternative, more speculative explanation would be that the Triassic succession that sits now on top of the Mieming–Zugspitze thrust, originally onlapped a salt anticline, i.e., an anticline formed by rising salt (e.g., Hudec and Jackson 2007). During Cretaceous inversion, the Triassic succession would have been detached along the unconformity, separated from the underlying salt and thrust onto the Schrambach shales. Salt has not been observed in Wetterstein and Mieming mountains, but further east in the Karwendel mountains (KM of Fig. 2) at the base of the Inntal thrust sheet (Schmidegg 1951; Heißel 1978; Spötl 1989). Around the salt occurrence and in its wider vicinity, the Wetterstein limestone is frequently in direct contact with cellular dolomites (Ampferer 1928; Ampferer and Heißel 1950; Krauter 1968; Moser 2008a, b) that are also often found in direct contact with Haselgebirge salt and shales (Spötl 1988) and may represent zones related to salt evacuation toward the surface and related salt tectonics. Such zones are also found in the Mieming mountains close to the core of the Mieming anticline (3 of Fig. 7a; see Becke 1983; Moser 2010) and may suggest the presence of salt in the study area.
The jump of the decollement from the Haselgebirge–Reichenhall succession during Cretaceous initial separation of the allochthon from its basement to the Kössen marls during Paleogene out-of-sequence thrusting may support this interpretation: The original decollement must have gained strength to force it into another position. If the Zugspitze and Mieming thrusts were originally related to salt, evacuation of this salt and welding could have caused strengthening of this contact, and subsequently the activation of the Kössen marl décollement during younger, Cretaceous to Paleogene shortening (compare Kilian and Ortner 2019). Backthrusting across this décollement also created the Holzerwies anticline (3 of Fig. 5) that was one of the main arguments for Miller (1963a) to propose S-directed transport of the Wetterstein mountains. However, this is superimposed after the switch of décollements into the Kössen marls.
General relevance of out-of-sequence thrusting at the Obermoos thrusts
Out-of-sequence thrusting often leads to inadmissible structures in cross sections, such as truncated anticlines and synclines (e.g., Butler 1987; Morley 1988; McClay 1992). In recent years evidence accumulates on the widespread existence of out-of-sequence thrusting (e.g., Kley 1996—Bolivian Andes; McDowell 1997—Rocky mountains of Montana; Molinaro et al. 2005—Zagros mountains; Olivetti et al. 2010—Peloritani mountains of Sicily; Sieniawska et al. 2010—Polish Carpathians; Ortner et al. 2015—Subalpine Molasse, Alps). In Fig. 15 we illustrate the case of two parallel décollements (position illustrated in legend in lower left). Décollement 1 is used during initial in-sequence emplacement of old on young rocks (Zugspitze thrust on right side of Fig. 15) and is abandoned after an increase of strength related to salt expulsion or release of overpressure. Subsequent shortening uses décollement 2 (Fig. 15) at the base of the youngest unit. The out-of-sequence thrust related to these shortening ramps across the older in-sequence thrust. Across the out-of-sequence thrust, old-on-young relationships are observed in the hinterland of the footwall cutoff of the in-sequence thrust, and in the foreland of the hanging wall cutoff (orange segments in Fig. 15). Young-on-old relationships are observed across the segment between the footwall and hanging wall cutoff (yellow segments in Fig. 15). This latter segment increases in length as the hanging wall travels across the upper footwall flat of the out-of-sequence thrust. The fault tip and the old-on-young and young-on-old segments of the out-of-sequence thrust are also visible in the inset of Fig. 13. The right side of Fig. 15 gives the local names used in this study.
Tectonic subdivision of the NCA
Revised tectonic subdivision of the western NCA
Joining the Zugspitze and Mieming thrusts by connecting the hanging- and footwall cutoffs across the out-of-sequence thrusts (Fig. 11) leads to one continuous thrust that disappears into the subsurface north of the Wetterstein mountains. The next old-on-young contact to the north is the contact of the Lechtal on top of Allgäu thrust sheet close to the northern margin of the NCA according to the old scheme (Figs. 2, 3a). In our interpretation, this contact is the continuation of the Zugspitze and Mieming thrusts (Fig. 16a). This interpretation renders the accepted tectonic subdivision of the western NCA of Ampferer (1912), Heißel (1958) and Tollmann (1976b) obsolete. Here we apply the new subdivision suggested by Kilian and Ortner (2019), provide definitions of the new units and discuss it on the scale of the western NCA (Fig. 17).
Kilian and Ortner (2019) introduced new terms and renamed the units including most of the former Lechtal and Inntal thrust sheets as the Karwendel thrust sheet, and the underlying unit the Tannheim thrust sheet. The latter includes the former Allgäu thrust sheet, the tectonic windows of the Puitental Zone and the eastern Karwendel mountains, and the Lechtal thrust sheet E of Innsbruck (Fig. 2). All units defined here have been thrust onto an upper footwall flat of a ramp-flat-system, and thus emplace old rocks on young rocks. We do not use out-of-sequence tectonic boundaries that emplace young on old rocks to delimit tectonic units.
Definition of the Karwendel thrust sheet
We name the Karwendel thrust following Ampferer (1902), who was the first to describe this thrust in the Karwendel Mountains. The Karwendel thrust sheet is a composite tectonic unit of the western NCA that was emplaced between the Hauterivian and Coniacian. In the Karwendel Mountains it is floored by the Karwendel thrust, in the Mieming Mountains by the Mieming thrust, in the Wetterstein Mountains by the Zugspitze thrust, which all have a Hauterivian age (Figs. 4c, 17). In the more external NCA, the Karwendel thrust sheet rests on the Albian Lechtal thrust named by Ampferer and Hammer (1911) E of Lech, whereas W of Lech, it lies on the Coniacian Mohnenfluh thrust. The latter thrust developed out-of-sequence, postdating the more external Allgäu thrust of Turonian age. The Lechtal and Mohnenfluh thrusts merged in the Turonian or later. Therefore, the Karwendel thrust sheet was assembled and separated from the underlying units during progressive Early to Late Cretaceous thrust transport.
The Karwendel thrust sheet overlies the Tannheim thrust sheet over most of its extent. Only in the westernmost NCA, where the Tannheim thrust sheet ends, the Karwendel thrust sheet overlies the Arosa zone across a thrust of Turonian age.
The Imst part of the Karwendel thrust sheet is named after the city of Imst (Fig. 17). West of the Höll shear zone, this unit repeats the main Karwendel thrust sheet across the Heiterwand thrust (Hahn 1911) of Cenomanian age. The Höll shear zone, sitting on the Mieming thrust separates the main Karwendel thrust sheet from its Imst part, and allows NW-directed movement of the Imst part relative to the main Karwendel thust sheet. The Heiterwand thrust at the base of the Imst part of the Karwendel thrust sheet appears and gains offset where the Lechtal thrust starts to lose offset, and ends NE of Lech (Fig. 17).
The Tannheim thrust sheet tapers to the south below the Imst part of the Karwendel thrust sheet west of the Höll shear zone (Figs. 16b, 18a) (Eisbacher et al. 1990). East of the Höll shear zone, it continues further to the southeast, and reappears at the surface near Innsbruck (Fig. 17). Therefore, a lateral ramp (seen in Fig. 18b) in the basal décollement is necessary that separates the Tannheim thrust sheet from the Karwendel thrust sheet and localizes the Höll shear zone at surface (Fig. 16b).
In the Arlberg region SE of Lech, and W of Imst, the Imst part of the Karwendel thrust sheet is overlain by klippen belonging to the Krabachjoch thrust sheet (Ampferer 1914b). The Krabachjoch thrust branches from the Heiterwand thrust. However, its age remains unknown, as there are no synorogenic sediments in its footwall. We include the Fallesin klippe (F of Fig. 17) into the Krabachjoch thrust sheet because of its position SE of the branch line, and because of its anchimetamorphism comparable to the main Krabachjoch Klippe (K of Fig. 17) (Petschick 1989).
Definition of the Tannheim thrust sheet
The name of the Tannheim thrust sheet derives from the Tannheim village located within the thrust sheet (Fig. 17). The Tannheim thrust sheet was transported on the Turonian Allgäu thrust onto the CRS (Fig. 4b, c) and the Arosa Zone west of 10.4°E (Fig. 17). It forms a narrow strip at the northern margin of the NCA, except in the Allgäu region around Tannheim and SE of Oberstdorf. Locally, the Allgäu thrust and the underlying CRS/Arosa Zone are cut out at the northern margin of the NCA. There, the Tannheim thrust sheet rests directly on the Rhenodanubian Flysch nappes across a Paleogene thrust. The Tannheim thrust sheet is also exposed in some windows in the more internal part of the NCA, like the Puitental window between the Mieming and Zugspitze thrusts, and the Eng Window between the Karwendel and Eng thrusts (Fig. 17), where the Tannheim thust sheet was exhumed by duplexing in response to Late Cretaceous erosion (Kilian et al. 2021).
Why do we need new names?
The names of nappes or thrust sheets are closely connected to the definition of the respective units. Previous authors (Ampferer 1912; Heißel 1958; Tollmann 1970a, b, 1976b) emphasized the existence of thrusts or faults on all sides of their nappes, and none of them included the ages of the thrusts nor thrust geometry in the definitions of the Allgäu-, Lechtal, and Inntal nappes (see “Kinematics of thrusts”). Even if many of the boundaries of the thrust sheets defined here coincide with previously defined nappe boundaries that have been correctly recognized, we exclude out-of-sequence thrusts that stack young on old rocks and that do not have the geometry of an allochthon on an upper footwall flat.
Our definition includes thrust ages and thrust geometry. Therefore, the Tannheim and Karwendel thrust sheets were stacked at a defined time and have a defined geometry (see “Definition of the Karwendel thrust sheet”, “Definition of the Tannheim thrust sheet”). Any solution that just combines the names of the former units, such as Inntal–Lechtal thrust sheet, as suggested by Mandl et al. (2017) in a poster, would need specification which part of the former Lechtal thrust sheet is meant. Such a solution also perpetuates inconsistencies in timing of thrust transport.
What do the old names mean in the new subdivision?
The Allgäu thrust sheet is equivalent to the new Tannheim thrust sheet minus the units exposed in the Puitental and eastern Karwendel tectonic windows (Fig. 17). The Allgäu- and Lechtal thrust sheets of Ampferer (1912) are separated by the Lechtal thrust at the base of the external Karwendel thrust sheet. The Inntal thrust sheet is floored by the Karwendel thrust and the Heiterwand thrust. The main bodies of the Lechtal and Inntal thrust sheets are separated by the out-of-sequence Heiterwand thrust west of the Höll shear zone, and the out-of-sequence Puitental backthrust and Eng thrust east of the Höll shear zone (Figs. 7, 17).
Relationship of the Karwendel and Tannheim thrust sheets to the Tirolic and Bajuvaric nappe systems
Connecting the main bodies if the former Lechtal and Inntal thrust sheets also connects the Tirolic and Bajuvaric thrust systems in the western NCA as defined by Hahn (1913a). Two lines of argument have been used to solve this problem:
Kilian and Ortner (2019) concluded that the new Karwendel thrust sheet should be part of the Tirolic thrust system, based on (i) the observation of a Lower Cretaceous Roßfeld-type sedimentary succession on the eastern Karwendel thrust sheet (compare Hahn 1912, p. 341), and (ii) the presence of Upper Jurassic allodapic limestones in the same area. This is in accordance with the conclusions of Mandl et al. (2017).
The thrust sheets of the Tirolic nappe system have a sedimentary contact to the Greywacke Zone of the Noric nappe system (Fig. 1; Tirolic–Noric nappe system) (Hahn 1912, p. 340; Schmid et al. 2004; Schuster 2015), while the Bajuvaric nappe system is attached to the Silvretta basement nappe (Fig. 1) (Frank 1987; Janák et al. 2004). The Karwendel thrust sheet has a sedimentary contact to the Phyllitgneis Zone of the Silvretta nappe in its westernmost portion (Stingl 1984; Spiess 1985; Rockenschaub 1990; Nowotny et al. 1992; Ortner et al. 2006a), also including its Imst part (Fig. 16b) (Eisbacher et al. 1990). Consequently, the Karwendel thrust sheet must be part of the Bajuvaric nappe system.
If the Karwendel thrust sheet would be part of the Tirolic nappe system (case 1), the latter would have a sedimentary contact to both the Phyllitgneis Zone and the Greywacke Zone. However, the Pyllitgneis Zone is a part of the Silvretta nappe (Rockenschaub 1990; Nowotny et al. 1992), the lowermost unit of the Upper Austroalpine nappe edifice, while the Greywacke Zone is a tectonically much higher unit (Schmid et al. 2004; Schuster 2015), with the Innsbruck Quartzphyllite nappe and the Ötztal basement nappe and equivalents in between (see cross sections in Ortner et al. 2006b). It seems improbable that such a major boundary has almost zero offset within the NCA NE of Lech (Fig. 17). Alternatively, the Karwendel thrust sheet and thus all thrust sheets of the western NCA are part of the Bajuvaric nappe system (case 2). In such a case, the boundary between the Bajuvaric and Tirolic unit is the Paleogene Brixlegg thrust that is largely cut out by the Oligo-Miocene sinistral Inntal shear zone (ISZ of Fig. 17), and that was identified in the TRANSALP seismic line (Ortner et al. 2006b). Unfortunately, the Brixlegg thrust is another out-of-sequence thrust postdating Cretaceous nappe stacking. The similarity of the easternmost Karwendel thrust sheet and the Staufen–Höllengebirge nappe in terms of facies (see case 1 above) suggests that these were initially laterally adjacent until the Cretaceous. However, the boundary of the Karwendel thrust sheet and the Staufen–Höllengebirge nappe is not within the scope of this contribution, and will be discussed elsewhere. We conclude that the Karwendel thrust sheet is part of the Bajuvaric nappe system based on its primary sedimentary contact to the Silvretta basement nappe.
Thrust distance and rates
Combining the former Lechtal and Inntal thrust sheets increases the thrust distance to at least 38 km in the Karwendel mountains (Kilian and Ortner 2019), and to 35 km in the Wetterstein and Mieming mountains, which is the surface N–S length of the Karwendel thrust sheet (Fig. 16a). This value excludes folding and minor thrusting within the unit. Considering NW-directed transport (see “Structural evolution of the NCA”, “Western and southern flank of the Wetterstein and Mieming mountains”; Fig. 2) increases these values to 41 km for both cross sections. We consider a thrust sheet travelling across an upper footwall flat that covers the upper-footwall-flat deposition zone and ends deposition (Fig. 6). Thrust advance rates can be deduced when the age of the youngest sediments below a thrust sheet at two points arranged in thrust direction is known: The Karwendel thrust sheet is floored by upper-footwall deposits that are exposed close to the northern margin of the NCA (label 8 of Fig. 2), where these reach into the Albian (Gaupp 1982). S of Zugspitze, upper-footwall deposits are found within the Puitental Zone and at Eibsee (labels 4 and 5 of Fig. 2), where they reach into the Hauterivian (Vidal 1953; Miller 1963c); the rate of thrust propagation using the 27 km distance between the two locations amounts to 0.06 cm/year in NW–SE direction, which is rather slow as compared to active present-day orogenic wedges (e.g., 1.2 cm/year, Himalayan thrust front—Wesnousky et al. 1999; 0.45 cm/year, thrust front of the central Andes—Schmidt et al. 2011; 3 cm/year, Taiwan orogenic front—Malavieille et al. 2021).
Based on our structural analysis, we propose a new tectonic subdivision of the western NCA. This subdivision has only two large thrust sheets, the tectonically deeper unit being the Tannheim thrust sheet, the tectonically higher the Karwendel thrust sheet. The observation of out-of-sequence thrusts that crosscut and locally repeat the in-sequence thrust and end laterally, allows to keep the Wetterstein mountains in stratigraphic contact with their northeastern foreland and, at the same time, sitting on the thrust at the base of the Karwendel thrust sheet. This solves a 100-year-old controversy (see Sect. 1.3).
The following steps are evident in the kinematic evolution of the Wetterstein and Mieming mountains (Fig. 19):
Between the Hauterivian and Albian, the Karwendel thrust sheet travelled at least 40 km to the NW over the Tannheim thrust sheet, possibly detached on salt.
Albian activity of E-trending sinistral faults (Puitental faults) separates Cretaceous NW-directed emplacement of thrust sheets from younger N- to NNE-directed out-of-sequence thrusting. These faults crosscut the entire nappe stack and reached into the underlying crust and mantle, facilitating the ascent of mantle-derived melts leading to intrusion of basanitic dykes (Ehrwaldites) into the shear zones in the late Albian. These faults have km-scale vertical, N-down offset.
Renewed Cenomanian NW-directed transport emplaced the Imst part of the Karwendel thrust sheet S of the WNW-striking Höll shear zone. Strain partitioning across the Höll shear zone caused N- to NNE-directed contraction north of this fault.
The steps across the Puitental faults localized out-of-sequence thrusting, both foreland-directed (Obermoos thrusts), and hinterland-directed (Puitental backthrust) that dissected Cretaceous thrust sheet boundaries. These thrusts have km-scale offsets and are kinematically linked to sinistral, NE-striking tear faults of the Loisach fault set. Both formed probably during collision and have a Paleogene age in the Wetterstein and Mieming mountains, but a Miocene age in the northern, most external part of the NCA.
The Telfs fault is directly linked to Miocene NW-directed thrusting of the Ötztal basement nappe onto the NCA.
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High resolution DEMs and orthophotographic images were used to analyze stratal and fault geometries. These were provided by the state of Tyrol and the Bavarian Agency for Digitisation, High-Speed Internet and Surveying, which is greatly acknowledged. We thank Petroleum Experts Ltd. who provided their Move software package that was used to create Figs. 3, 4, 11, 13, 15 and 16. The work of Sinah Kilian was supported by the state of Tyrol (Tiroler Wissenschaftsfonds, grant UNI-0404/2295) and the Doctoral programme of the University of Innsbruck (Grant 2018/GEO-8). We thank Gabor Heja (Budapest) for help during field work. We acknowledge the comments of S. Schmid and two anonymous reviewers, and of the thematic editor N. Froitzheim. Especially the rigorous review of S. Schmid helped to sharpen the ideas presented in this paper.
Open access funding provided by University of Innsbruck and Medical University of Innsbruck.
Below is the link to the electronic supplementary material.
Supplementary file1 New tectonic subdivision of the western NCA as presented in this paper. This subdivision is in accordance with the distribution of all synorogenic sediments of the western NCA. All thrusts and related tear faults that are not in the general foreland-propagating thrust sequence are classified as out-of-sequence thrusts/faults (EPS 6964 KB)
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Ortner, H., Kilian, S. Thrust tectonics in the Wetterstein and Mieming mountains, and a new tectonic subdivision of the Northern Calcareous Alps of Western Austria and Southern Germany. Int J Earth Sci (Geol Rundsch) 111, 543–571 (2022). https://doi.org/10.1007/s00531-021-02128-3
- Tectonic subdivision
- Thrust kinematics
- Out-of-sequence thrusts
- Eastern Alps