Seismic basement in Poland
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The area of contact between Precambrian and Phanerozoic Europe in Poland has complicated structure of sedimentary cover and basement. The thinnest sedimentary cover in the Mazury-Belarus anteclize is only 0.3–1 km thick, increases to 7–8 km along the East European Craton margin, and 9–12 km in the Trans-European Suture Zone (TESZ). The Variscan domain is characterized by a 1- to 2-km-thick sedimentary cover, while the Carpathians are characterized by very thick sediments, up to c. 20 km. The map of the basement depth is created by combining data from geological boreholes with a set of regional seismic refraction profiles. These maps do not provide data about the basement depth in the central part of the TESZ and in the Carpathians. Therefore, the data set is supplemented by 32 models from deep seismic sounding profiles and a map of a high-resistivity (low-conductivity) layer from magnetotelluric soundings, identified as a basement. All of these data provide knowledge about the basement depth and of P-wave seismic velocities of the crystalline and consolidated type of basement for the whole area of Poland. Finally, the differentiation of the basement depth and velocity is discussed with respect to geophysical fields and the tectonic division of the area.
KeywordsBasement Thickness of sediments Seismic velocities Poland
The sedimentary cover of the EEC in northern Poland is rather thin, being only 0.3–1 km thick in the region of the Mazury-Belarus anteclize, but increases southwestwards to 7–8 km along the EEC margin. In the TESZ, the sedimentary layer attains a thickness of up to 9–12 km. The Variscan domain is characterized by a 1- to 2-km-thick sedimentary cover, while the Carpathians are characterized by very thick sediments of up to c. 20 km (e.g., Guterch and Grad 2006). For this reason, the basement in the TESZ and in the Carpathians is not reached by boreholes, so its depth is available only from geophysical investigations, mostly from seismic profiling. In particular, seismic velocities in the basement could be used for discrimination between the crystalline and consolidated types of the crust. According to Dadlez (2006) and Dadlez et al. (2005), the crystalline crust is considered to consist of highly deformed metamorphic and igneous rocks, characteristic of Precambrian platforms. By contrast, the consolidated crust is composed of highly deformed but not necessarily metamorphosed sedimentary and subordinate igneous rocks, characteristic of the Paleozoic platform. The aim of this paper is to find the geometry of the seismic basement, its velocity, as well as the relationship between the crystalline basement, the consolidated basement, and the sedimentary cover in Poland.
Geological and geophysical context
Seismic cross sections for profiles M-7, 1-VI-66, and P4, all close to line AA′, are shown in Fig. 2c, d. The sedimentary cover along the geological cross section (Fig. 2b) and seismic cross section along the P4 profile (Fig. 2d) show similar sequences of layers, including complicated Permian (Zechstein) salt diapirs and salt pillows in the TESZ (Krzywiec 2006a, b; Mazur et al. 2005). However, the major structural features of the seismic profiles are the basement depth and its velocity differentiation: c. 6.1 km/s for the EEP and c. 5.8 km/s for the WEP (Grad et al. 1991, 2003a, b). Differentiation of the basement is also observed in the complicated pattern of the Bouguer anomalies, the irregular pattern of the magnetic anomalies, electromagnetic properties, and the heat flow. All of these observations will be discussed at the end of the paper, together with the tectonic subdivisions of the area of Poland.
The complete basement depth map of the East European Craton in northeastern Poland was created by Skorupa (1974). This study covered an area of the EEC where the thickness of sediments is only 0.3–1 km thick in the region of the Mazury-Belarus anteclize, mostly less than 4 km, and reaches c. 10 km on the edge of the East European Craton (see Fig. 3b, NE Poland). The study was based on data from geological boreholes and the set of regional seismic refraction profiles available at that time. In our elaboration, a corresponding mask for this map is calculated as having value 1 where data are available and value 0 elsewhere. This map covers 42.1 % of the area of Poland.
A second basement depth map was compiled, based on geological boreholes data, using maps from the geological atlas of horizontal cuttings (Kotański 1997; Piotrowska et al. 2005; Małolepszy 2005; Nita et al. 2007; http://model3d.pgi.gov.pl/pages/miazszosc_podloze.htm). The compiled map was prepared down to 6 km depths, but knowing that borehole surveying has a limited range (due to the small amount of deep wells) only depths down to 4.5 km are considered in this paper. A proper mask for this map is calculated as having value 1 where data are available and the basement depth is shallower than 4.5 km, and value 0 elsewhere. This map (Fig. 3a) covers 58.3 % of the area of Poland.
Most of the Carpathian basement is not reached by boreholes. The use of the magnetotelluric method allowed for a study of the area where sediments are very thick—up to c. 25 km. In magnetotelluric soundings, the basement is identified as a high-resistivity (low-conductivity) layer. The map of such a “basement” was prepared for the Carpathians using data form magnetotelluric soundings and boreholes by Stefaniuk and Klityński (2007). A proper mask for this map is calculated as having value 1 where data are available and value 0 elsewhere. This map is shown in Fig. 3b (southern Poland) and covers 6.6 % of the area of Poland.
Combined together, these three maps (Fig. 3a, b) cover 75.9 % of the area of Poland, but do not provide data about the basement depth in central Poland—in the area of the Trans-European Suture Zone (TESZ). The goal of this paper is to provide full knowledge of the basement depth for the whole area of Poland. To achieve this, the data set is supplemented by 32 models from deep seismic refraction profiles. The area of Poland is very well covered with modern seismic refraction profiles from multiple experiments, which are detailed in the figure caption of Fig. 3 with corresponding references.
For each profile, detailed 2D models of seismic velocities are analyzed in 1000 m (horizontal) by 100 m (vertical) resolution. Each model grid cell contains information about the P-wave seismic velocity and the layer number. The layer number allows tracking of geological layers for the profile. Additionally, the exact geographical locations of grid columns along the profile path are calculated. For each profile, the layer numbers corresponding to the basement are noted, allowing us to derive the basement depth for a certain location along the profile path.
The processing of all profiles provides a data set which includes latitude, longitude, basement depth, and P-wave velocity of the uppermost basement. This distinct distribution of points is later interpolated to a grid using GMT 5.1.1 surface command (Wessel and Smith 1991, 1998) with both interior and boundary tension parameters set to 0.5, and the convergence limit set to 0.01. Additionally, a grid mask is calculated as having value 1 in grid cells, within 20 km from any data point along the profile, and value 0 in other cases. A basement depth map calculated from seismic refraction profiles with an overlaying mask is shown in Fig. 3c. This map covers 72.3 % of the area of Poland.
The resulting seismic basement map is created by combining the basement map created from seismic refraction profiles data with three additional basement depth maps available for parts of Poland. Figure 3d shows the data availability map (sum of four masks mentioned above). 94.3 % of the area of Poland is covered by at least one data source, 66.9 % is covered by at least two data sources, and 19.0 % is covered by at least three data sources. Finally, a combined basement map is obtained by averaging all four maps within the area of their availability and interpolating within gaps using the GMT 5.1.1 surface command with both interior and boundary tension parameters set to 0.5, and convergence limit set to 0.01. The resulting interpolated map covers 100 % of the area of Poland and is shown in Fig. 3e.
Apart from the basement depth, the analysis of seismic refraction profiles provides the P-wave velocity of the uppermost basement. Figure 3f shows the result of interpolation of these data to a full grid. One issue is identified regarding the velocity map—in Fig. 3f it is marked by ellipse. In southern Poland, one of the profiles (CEL14) provides P-wave velocities much higher than for the other profiles around it, which are located nearly perpendicular to it. This is identified as the result of anisotropy in seismic velocities in this area (Środa 2006), and for further analysis P-wave velocities for profile CEL14 are reduced by 6 %. After applying this change to the data sets, the P-wave map is recalculated.
Seismic basement: results
The main features of the basement depth map in Poland (Fig. 4a) are a deep trough in the TESZ and a deep basement in the Carpathians. The depth difference of the basement over the area reaches up to 20 km. In the EEC, the change in the basement depth is smooth, increasing from c. 1 km in the northeast to c. 10 km toward the southwest at the margin of the craton. This smooth shape could be due to the Earth’s surface erosion, “polishing” the rocks’ trough for a million years from the Precambrian onward. As a result, the basement depth of the EEC does not show any distinct correlation with crystalline massifs and domains. To the southwest of the Variscan deformation front, the depth of the Paleozoic basement of the WEP is increasing from c. 1 km in the southwest to c. 10 km toward the TESZ in the northeast. The basement below the Carpathians is deepening toward the south and reaches up to 20 km in depth. In the Polish Carpathians, a deeper basement was found in the eastern part, the border of which roughly follows c. 21°E longitude. The triangle-shape area between EEC, WEP, and Carpathians is characterized by a 2- to 5-km-deep basement.
Laske and Masters (1997) provide a global model of sediments’ thickness with a resolution of 0.5° by 0.5°. The thickness of sediments is provided and for a comparison with our basement depth, a Digital Elevation Model (Michalak 2004) has to be included. The difference between the map from this study and the map by Laske and Masters (1997) is shown in Fig. 5b. Molinari and Morelli (2011) provide a crustal model for the European Plate (EPcrust) with a resolution of 0.5° by 0.5°, from which the thickness of sediments is taken. For a comparison with our basement depth, a Digital Elevation Model (Michalak 2004) has to be included to reduce the thickness to depth in relation to the sea level. The difference between the map from this study and the map by Molinari and Morelli (2011) is shown in Fig. 5c. Tesauro et al. (2008) provide a crustal model for Western and Central Europe and surroundings with 0.25° by 0.25° resolution from which the basement depth is taken for comparison. The difference between the map from this study and the map by Tesauro et al. (2008) is shown in Fig. 5d.
The comparison of our basement map with previously published maps shows many similarities, particularly for the EEC and the WEP. For these areas, differences are in the order of 1 km only for the Laske and Masters (1997) map, and of up to 3 km for the Molinari and Morelli (2011) and the Tesauro et al. (2008) maps. Much larger differences are observed in the TESZ, particularly in NW Poland, and in the Carpathians, particularly in their eastern part. For these areas, differences are larger for the Laske and Masters (1997) map, being up to 6–9 km, while for the Molinari and Morelli (2011) and the Tesauro et al. (2008) maps, the difference is in the order of 4–6 km. A recently published basement depth map for the Central European Basin System (Scheck-Wenderoth and Maystrenko 2013) also shows similar basement pattern in the TESZ area in NW Poland.
Complementary to the basement depth map is the P-wave velocity map of the uppermost basement (Fig. 4b). Velocities Vp > 6 km/s are observed in the EEC, north of the TTZ. However, this cratonic area is not homogeneous. Two distinct boundaries in velocity are marked in Fig. 4b by dashed lines that delineate the Fennoscandia–Sarmatia Suture (FSS) and the Mid-Lithuanian suture zone (MLSZ). The FSS is a suture between two once autonomous crustal segments/megablocks—Fennoscandia and Sarmatia (e.g., Bogdanova et al. 2006, 2008). The second boundary, SW–NE trending belt date from the initial assembly of this part of Baltica by terrane accretion, and is a feature that has been interpreted as the Mid-Lithuanian suture zone (MLSZ; e.g., Skridlaite and Motuza 2001; Skridlaitė et al. 2006). In the area of Lithuania, the MLSZ is 30–40 km wide and its continuation follows the border between Baltic terrane and Polish-Latvian terrane in the area of Poland (Cymerman 2007). The belt between the MLSZ and the FSS is characterized by significantly lower velocities of the uppermost basement. In northeastern Poland, along the state border, the relatively small areas with high P-wave velocities were found. They are interpreted as high-velocity magmatic intrusions beneath profile P4 and beneath the profile P5. Unfortunately, both intrusions are crossed only by one single profile, thus their size and shape could not be determined from these profiles alone. These intrusions are known as anorthosite bodies of Suwałki and Kętrzyn within the Paleoproterozoic (1.50–1.56 Ga) Mazury granitoid complex. The youngest magmatic Neoproterozoic–Paleozoic rocks in the region are intrusions of alkaline rocks (e.g., Tajno intrusion; Ryka 1984); however, they were not crossed by any of the profile. Accordingly they are not visible in the velocity map.
Southwest of the TTZ, velocities of the uppermost basement are significantly lower, being Vp < 6 km/s. Only in southern Poland, in the corner between the Variscan deformation front and the Carpathians, velocities Vp > 6 km/s are observed, in the area of the Upper Silesian Block (USB in Fig. 1).
Velocity–depth relations for basement in Poland, V(z) = a + bz [m/s], z—depth [m] n—number of velocity samples
b × 104
Depth range [m]
The Bouguer anomaly values (Fig. 7b; Królikowski and Petecki 1995; Wybraniec 1999; Bielik et al. 2006) display values as low as −60 mGal over the TESZ. However, the northeasternmost portion of this gravity minimum overlays an intrabasement feature of the EEC. The adjacent Paleozoic terranes to the southwest and the EEC to the northeast are characterized by near-zero to positive gravity anomalies of up to +20 and +10 mGal, respectively. In the Carpathians, Bouguer anomalies reach values of about −80 mGal.
The magnetic anomalies within the TESZ and in the Carpathians (Fig. 7c; Wybraniec 1999; Petecki et al. 2003) are subdued (±100 nT), which may result from the deeply buried magnetic basement. In contrast, the EEC magnetic anomalies vary at short wavelengths from 1500 to +1500 nT and correlate well with tectonic features and intrusions.
The area of the Pomeranian part of TESZ is characterized by relatively low velocities of the uppermost basement (Vp ~ 5.85 km/s), and correlates well with the location of pronounced sub-horizontal conductor found by the electromagnetic studies (Ernst et al. 2008; Jóźwiak 2013). The conductor has a resistivity as low as 2 Ωm, and is interpreted as Silurian–Cambrian metasediments. Its enhanced conductivity may be caused either by electronic conductors (graphite, alum shale) within Caledonian formations initially rich in coal facies, or by saline fluids (crustal brines) located most likely in the vicinity of deep fault systems (Ernst et al. 2008).
Heat flow variations in the area of Poland (Fig. 7d; Karwasiecka and Bruszewska 1997; Majorowicz et al. 2003) indicate a major change in the thermal regime. In general, the TESZ separates a “cold” EEC area with a low heat flow of c. 40 mW/m2 to the northeast from a “hot” area with a higher heat flow of 40–70 mW/m2 in the Paleozoic terranes and Carpathians to the southwest.
The morphology of the geophysical fields, shown in these three maps, coincides in general with the tectonic structure in Poland and has a clear lineation in the NW–SE direction. According to Karnkowski (2008), four principal types of basement structure can be distinguished in the area of Poland: the EEC basement in the northeast, the Caledonian (TESZ) southwest of the EEC edge, the Variscan in SE Poland, and Cadomian basement in the south (Fig. 7e). These features coincide with the map of the basement slope calculated from our basement map (Fig. 7a). Slope values are shown in degree up from horizontal. A small slope is characteristic for the whole area of the EEC, the WEP, and the Cadomian basement. In this map, the TTZ follows the southern edge of the EEC with a slope of 8–12o. The northern edge of the WEP, corresponding to the Variscan deformation front (see Fig. 1), is bounded by a zone with a significant slope of 10–15o. The steepest slope of the basement is observed below the Carpathians, particularly their eastern part, where the basement slope reaches a value of up to c. 20o.
The TTZ in Poland, interpreted as the edge of the EEC, is a NW–SE trending feature. However, its position differs in details according to different authors (Fig. 7f): Dadlez (1982), Pożaryski et al. (1992), Karnkowski (2008), and Narkiewicz et al. (2011). This variation in location may reach up to 50 km. Additionally, the magnetic line bordering the southern margin of the EEC (Pomeranian Massif) after Królikowski (2006) is shown in Fig. 7f.
In Fig. 8b, laboratory data for a high-temperature regime are shown for various rock assemblages. The observed velocities in the WEP basement are close to basalt and quartzite, particularly for the depth range of 10–15 km. Granite/gneiss and biotite/tonalite/gneiss have higher velocities. On the other hand, gneisses are actually the most common lithology exposed in that area (e.g., Mueller 1995), and borehole data from the basement of the Wolsztyn-Leszno High show the occurrence of phyllites.
The relatively low-velocity basement of the TESZ can be interpreted as an extensive pile of low-grade metasediments (e.g., metagraywackes). Alternatively, it may also represent a gneiss complex, if intense NW–SE-oriented anisotropy is assumed consistent with the regional geological context (Jarosiński and Dąbrowski 2006; Środa 2006). Anisotropy has not been taken into account in Fig. 8a, but it should be noted that according to Christensen and Mooney (1995), anisotropy can reach values ranging from 1 to 5 % (e.g., granite/granodiorite, granite/gneiss, basalt, metagraywacke, quartzite) to 10–20 % (e.g., phyllite, slate, amphibolite) in basement rocks.
Close to the margin of the EEC, there is no direct information about the type of rocks and the age of the basement. However, in the northeastern EEC, drill holes have provided considerable information about the Precambrian basement (Ryka 1984; Skridlaite and Motuza 2001). Accordingly, the Palaeoproterozoic crystalline basement of the EEC is mostly composed of granulites, migmatites, anorthosites, and granite/gneisses (e.g., Ryka 1984; Skridlaite and Motuza 2001).
In Poland, the basement in the TESZ and the Carpathians is not reached by boreholes, so its depth and velocity are available only from seismic profiles and can be inferred indirectly by a joint integration of geophysical data. Using all available data, a basement depth map and the distribution of seismic P-wave velocity in the uppermost basement for the area of Poland were created.
The new results of this paper, regarding the seismic basement in the area of Poland, are displayed in three maps: the basement depth map (Fig. 4a), the P-wave velocity map of the uppermost basement (Fig. 4b), and the map of the basement slope (Fig. 7a).
The basement depth map is compared with three basement maps published earlier: global by Laske and Masters (1997), European crustal model EPcrust by Molinari and Morelli (2011), and crustal model for Western and Central Europe by Tesauro et al. (2008). The comparison shows many similarities, particularly for the EEC and the WEP (Fig. 5). In the TESZ in NW Poland, large differences of up to 6–9 km could be explained by another discrimination between the crystalline (Precambrian) and consolidated (Paleozoic) types of crust. Two types of crust are reflected in basement velocities: velocities Vp > 6 km/s are observed in the EEC, north of the TTZ, while southwest of the TTZ velocities of the uppermost basement are significantly lower, being Vp < 6 km/s. The continuation of the structures to the northwest is discussed for the Central European Basin System (Scheck-Wenderoth and Maystrenko 2013) and the Danish area and surroundings (Lassen and Thybo 2012).
Differences of basement velocities for the EEC and the WEP correspond to the density differentiation of both provinces. The EEC basement density of 2.71–2.75 g/cm3 was modeled across the Skagerrak Graben (Lassen and Thybo 2012). In NW Poland, Królikowski and Petecki (2002) obtained a 2D density model along the LT-7 profile with basement values of 2.68 g/cm3 for WEP and 2.82 g/cm3 for EEP. Similar values were applied by Maystrenko and Scheck-Wenderoth (2013) in a 3D density model of the Central European Basin System and adjacent areas: 2.79–2.83 g/cm3 for EEC basement, 2.67 g/cm3 for Variscan granitoids, and 2.79 g/cm3 for Variscan upper crust.
Slightly smaller basement densities were found in Poland in the eastern portion of EEC. The top part of the crystalline Precambrian basement has excellent density evidence thanks to a number of sampled boreholes, deeply penetrating the crystalline basement. Only these boreholes, which penetrate the crystalline basement into depths of at least several tens of meters, were recognized as representative ones, because of the weathering of the surface of the crystalline basement in ancient times and some other processes leading to a decrease in the density at several meters depths. The top of the Precambrian basement represents the “granitoid type” which consists mostly of gneisses, with an average density of 2.72 g/cm3 (Krysiński et al. 2009). Similar basement density values, c. 2.75 g/cm3, were found from 2D gravity modeling along the seismic profile POLCRUST-01 in SE Poland (Narkiewicz et al. 2015). A constant density of 2.70 g/cm3, corresponding to rocks in the top of the crystalline complex of old cratons, was assigned to rocks of the crystalline basement of the EEC in SE Poland by Grabowska and Bojdys (2001).
The map of the basement slope (Fig. 7a) shows two significant features running in NW–SE directions through central Poland: the northern one could be related to the edge of the EEC, while the southern one to the Variscan deformation front (see Fig. 1). The edge of the EEC in Poland, the Teisseyre-Tornquist Zone (TTZ), continues in SW Scandinavia as the Sorgenfrei-Tornquist Zone (STZ). This boundary between Baltica and Phanerozoic Europe is well visible in the basement, Moho depth, as well as in lithospheric thickness (e.g., Lassen and Thybo 2012; Scheck-Wenderoth and Maystrenko 2013; Grad et al. 2009, 2014; Knapmeyer-Endrun et al. 2014; Wilde-Piórko et al. 2010; Puziewicz et al. 2006; Gregersen et al. 2002; Geissler et al. 2010). The gravity modeling suggests a very small density value in the uppermost mantle 3.11 g/cm3 below the younger area of WEP, while for the older area of EEC, it is 3.3 g/cm3 (e.g., Krysiński et al. 2009).
The position of the TTZ in Poland differs according to different geological and geophysical interpretations (Fig. 7f). As suggested by Karnkowski (2008), the tectonic sub-division in the area of Poland should be done at three levels: sub-Cenozoic, sub-Permian, and at the crystalline/consolidated basement. Within these levels, the range of tectonic units could be different. The edge of the EEC in the basement level is relatively clear and defines the southwestern range of the craton. However, another criterion in the continental scale could be one more—crustal criterion, e.g., range of the high velocity lower crust beneath EEC (Grad et al. 2002, 2003a, b, 2008).
Finally, the map of seismic basement depth and basement P-wave velocity map in the area of Poland will be an important contribution to the digital 3D seismic model of the crust and uppermost mantle. Together with detailed data about geometry and velocities in the sedimentary cover (Grad and Polkowski 2012; Polkowski and Grad 2015), and a huge set of regional seismic refraction profiles, they permit for the creation of a detailed model for seismic local, regional, and global studies (Malinowski et al. 2013; Grad et al. 2015).
The basement depth and uppermost basement P-wave velocity maps for the area of Poland, filtered with 30-km-radius boxcar filter, as shown in Fig. 4, can be found in digital form at: http://www.igf.fuw.edu.pl/seismic/.
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