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Early miocene post-collisional calc-alkaline magmatism along the easternmost segment of the periadriatic fault system (Slovenia and Croatia)

Untermiozäner, kalkalkaliner Post-Kollisions-Magmatismus entlang des östlichsten Segmentes des periadriatischen Störungssystems (Slowenien und Kroatien)

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Summary

Early Miocene calc-alkaline igneous rocks from the easternmost segment of the Periadriatic fault system can be subdivided into two series of different alkalinity: (1) Volcanics which occur in the vicinity of the Velenje-Rogatec Line range from high-alumina basalt via low-K and medium-K andesites to medium-K dacites. (2) In the Pohorje Mountains mafic rocks are lacking. A high-K tonalitic pluton crystallized at pressures of about 0.7 GPa as indicated by Al-in-hornblende barometry and accessory magmatic epidote. Rapid exhumation of the tonalite during dextral transtension along the Periadriatic fault system is indicated by tonalitic pebbles in Helvetian (?) clastic sediments. High-K andesitic to dacitic volcanics are interlayered with, and dikes cut, the clastic sediments.

Compositional variations shown by the volcanics from the Velenje-Rogatec Line are consistent with fractionation of the observed phenocryst assemblages (olivine, plagioclase, clinopyroxene, orthopyroxene, titanomagnetite). Substantial fractionation of plagioclase is indicated by decreasing Sr/Nd and Sr/Y values and increasing negative Eu anomalies with increasing SiO2. All samples have chondrite-normalized HREE > 9.6 and low (Tb/Yb)n ratios (1.29−1.08). With increasing SiO2, the abundances of HREE and Y (18 to 39 ppm) increase and those of Sc (32.5 to 20.9 ppm) decrease slightly. These features, together with low Hf/Lu and Zr/Y values (10.1–5.7 and 5.7−3.6, respectively), rule out garnet as a major fractionating phase. Since (La/Yb)n values (3.24–6.59) do not increase with SiO2 and chondrite-normalized REE patterns do not show concave-upward shapes, fractionation of amphibole was probably insignificant. Although Rb/Cs values (⩽ 18) are generally low, a significant contribution by continental crustal materials to the magmas by an AFC process is suggested by negative correlations of Nb/U(7.16 to 3.14) and Nb/Th(2.14 to 0.87) values with SiO2, as well as by low Hf/Ta(7.8−3.4), and in part also by K/Rb (340-71) and Zr/Rb (5.0−1.7) values.

Rocks from the Pohorje Mountains have high abundances of U. Values of Nb/U and Nb/Th are low (3.55 to 1.85 and 1.27 to 0.64, respectively) and are negatively correlated with SiO2. These features, in combination with high values of Ba/Nb (56 to 93), Ba/La (23–30), and Rb/Cs (19–56), as well as with previously published δ18O values (∼ 9‰) for the tonalite indicate a substantial contribution of the continental crust to these magmas. High Sr abundances (455 to 984 ppm) and moderate negative Eu anomalies suggest that fractionation of plagioclase was of minor importance. Although the rocks have relatively low Sc (9.3 to 3.8 ppm) and Y (21 to 14 ppm) contents, low (Tb/Yb)n values (1.67−1.14) indicate that garnet was not a major fractionating phase. Instead, fractionation of amphibole is a viable mechanism to explain the combination of high (La/Yb)n (21.8−13.1) and low (Tb/Yb)n.

Zusammenfassung

Untermiozäne Kalkalkali-Magmatite aus dem östlichen Bereich des Periadriatischen Lineaments gliedern sich in zwei Serien unterschiedlicher Alkalinität: (1) Entlang der Velenje-Rogatec-Linie treten High-Al-Basalte, Low-K- und Medium-K-Andesite und Medium-K-Dazite auf. (2) Im Pohorje-Gebirge, wo basische Magmatite fehlen, kristallisierte ein High-K-Tonalit bei Drücken von ca. 0.7 GPa (Al-in-Hornblende-Barometer, magmatischer Epidot). Gerölle dieses Tonalits in einer untermiozänen (Helvet?) klastischeu Abfolge belegen eine schnelle Heraushebung des Tonalits durch dextrale Transtension im östlichsten Bereich des periadriatischen Lineaments. Eingeschaltet in die klastischen Sedimente sind andesitische bis dazitische Pyroklastika und Laven sowie diskordante dazitische Gänge, die alle der High-K-Serie angehören.

Die chemische Variation innerhalb der Vulkanitserie von der Velenje-Rogatec-Linie läßt sich durch Fraktionierung der Einsprenglingsminerale Olivin, Plagioklas, Klinopyroxen, Orthopyroxen und Titanomagnetit erklären. Abnehmende Sr/Nd- und Sr/Y-Werte und zunehmende negative Eu-Anomalien mit steigendem SiO2 weisen auf eine bedeutende Plagioklas-Fraktionierung hin. Alle Vulkanite besitzen hohe Gehalte an schweren Seltenen Erden (chondritnormiert > 9.6) und geringe (Tb/Yb)n-Werte (1.29−1.08). Mit zunehmendem SiO2 nehmen die Gehalte an Yb(2.02 bis 4.30 ppm) und Y(18 bis 39 ppm) zu, während die Sc-Gehalte (32.5 bis 20.9 ppm) nur geringfügig abnehmen. Diese Charakteristika, zusammen mit geringen Hf/Lu- und Zr/Y-Werten (10.1−5.87 bzw. 5.7–3.6), schließen Granat als wesentliche, fraktionierende Phase aus. Da die (La/Yb)n-Verhältnisse (3.24–6.59) nicht mit SiO2 korrelieren und die chondritnormierten SeltenenErden-Muster keine nach oben konkaven Formen aufweisen, spielte die Fraktionierung von Amphibol keine wesentliche Rolle. Trotz geringer Rb/Cs-Werte (⩽ 18) wird eine beträchtliche krustale Kontamination der Magmen angenommen. Für einen AFC-Prozeß sprechen negative Korrelationen von Nb/U(7.16−3.14) und Nb/Th(2.14−0.87) mit SiO2 (bei steigenden Nb-, U- und Th-Gehalten), geringe Hf/Ta-Werte (7.8−4.3) und teilweise auch geringe K/Rb- (340-71) und Zr/Rb-Verhältnisse (5.0−1.7).

Die Magmatite des Pohorje-Gebirges weisen hohe U-Gehalte sowie geringe Nb/U-und Nb/Th-Verhältnisse auf (3.55−1.85 bzw. 1.27−0.64), die eine schwache negative Korrelation mit SiO2 zeigen. Zusammen mit hohen Ba/Nb-(56–93), Ba/La-(23-30) und Rb/Cs-Verhältnissen (19–56) sowie bereits publizierten δ8O-Werten (∼ 9‰) weisen diese Eigenschaften auf einen beträchtlichen Anteil assimilierten Krustenmaterials in den Magmen hin. Hohe Sr-Gehalte (455–984 ppm) und relativ geringe negative Eu-Anomalien machen es unwahrscheinlich, daß während des AFC-Prozesses in der Unterkruste wesentliche Mengen an Plagioklas fraktioniert wurden. Obwohl die Gehalte an Sc (9.3−3.8 ppm) und Y (21−14 ppm) relativ gering sind, scheidet Granat aufgrund der geringen (Tb/Yb)n- Verhältnisse (1.67−1.14) als dominierende Fraktionierungsphase aus. Die Kombination von hohen (La/Yb)n- Verhältnissen (21.8−13.1) und geringen (Tb/Yb)n-Verhältnissen deutet eher auf Amphibol als wichtige, fraktionierende Phase hin.

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References

  • Anić D (1957) Starost andezitskih erupcija u Hrvatskom Zagorju. Geol vjesnik Zagreb 11: 261–263

    Google Scholar 

  • Aničić B, Juriša M (1985) Tumač za list Rogatec. Osnovna geološka karta SFRJ, 1:100000, Savezni geoloski zavod, Belgrade, 76 pp

    Google Scholar 

  • Bauer FK, Scheinlaub HP (1980) Der Drauzug (Gailtaler Alpen-Nordkarawanken). In: Geologische Bundesanstalt, Oberholzer R (Hrsg) Der geologische Aufbau österreichs. Springer, Wien, pp 405–426

    Google Scholar 

  • Bigazzi G, Del Moro A, Macera P (1986) A quantitative approach to trace element and Sr isotope evolution in the Adamello batholith (northern Italy). Contrib Mineral Petrol 94: 46–53

    Google Scholar 

  • Bögel H (1975) Zur Literatur über die “Periadriatische Naht”. Verh Geol Bundesanstalt Wien 1975: 163–199

    Google Scholar 

  • Boynton WV (1984) Cosmochemistry of the rare earth elements: meteorite studies. In: Henderson P (ed) Rare earth element geochemistry. Elsevier, Amsterdam, pp 63–114

    Google Scholar 

  • Class C, Altherr R, Volker F, Eberz G, McCulloch MT (1994) Petrogenesis of Pliocene to Quaternary alkali basalts from the Huri Hills, Northern Kenya. Chem Geol 113: 1–22

    Google Scholar 

  • Cortecci G, Del Moro A, Leone G, Pardini GC (1979) Correlation between strontium and oxygen isotopic compositions of rocks from the Adamello Massif (Northern Italy). Contrib Mineral Petrol 68: 421–427

    Google Scholar 

  • Crnković B, Reić V, Braun K (1970) Hipersten-augitski andezit Kamenog vrha kraj Lepoglave (Hrvatsko Zagorje). Geol vjesnik Zagreb 23: 193–204

    Google Scholar 

  • Deleon G (1969) Pregled rezultata odredjivanja apsoiutne geološke starosti granitoidnih stena u Jugoslaviji. Radovi Inst geol-rud istraz ispit nukl drugih mineral sirovina Belgrade 6: 165–182

    Google Scholar 

  • DePaolo DJ (1981) Trace element and isotopic effects of combined wall rock assimilation and fractional crystallization. Earth Planet Sci Lett 53: 189–202

    Google Scholar 

  • Dolenec T, Pezdič J, Strmale D (1987) Izotopska sestava kisika v pohorskem tonalitu in čizlakitu (Isotopic composition of oxygen in igneous rocks of Pohorje). Geologija Ljubljana 30: 231–243

    Google Scholar 

  • Drovenik M, Plenicar M, Drovenik F (1980) Nastanek rudiść v SR Sloveniji (The origin of Slovenian ore deposits). Geologija Ljubljana 23: 1–157

    Google Scholar 

  • Evensen NM, Hamilton PJ, O'Nions RK (1978) Rare-earth abundances in chondritic meterorites. Geochim Cosmochim Acta 42: 1199–1212

    Google Scholar 

  • Exner Ch (1976) Die geologische Position der Magmatite des periadriatischen Lineaments. Verh Geol Bundesanstalt Wien 1976: 3–64

    Google Scholar 

  • Faninger E (1966) Hiperstenov andezit pri Sv. Roku ob Sotli. Geologija Ljubljana 9: 549–553

    Google Scholar 

  • Faninger E (1970) Pohorski tonalit in njegovi diferenciati. Geologija Ljubljana 13: 35–104

    Google Scholar 

  • Faninger E (1973) Pohorske magmatske kamenine. Geologija Ljubljana 16: 271–315

    Google Scholar 

  • Faninger E, Štrucl I (1978) Plutonic emplacement in the Eastern Karvanke Alps. Geologija Ljubljana 21: 81–87

    Google Scholar 

  • Fuchs W (1980) Das inneralpine Tertiär. In: Geologische Bundesanstalt, Oberhauser R (Hrsg) Der geologische Aufbau österreichs. Springer, Wien, pp 452–483

    Google Scholar 

  • Futa K, Stern Ch R (1988) Sr and Nd isotopic and trace element compositions of Quaternary volcanic centers of the southern Andes. Earth Planet Sci Lett 88: 253–262

    Google Scholar 

  • Golub Lj, Brajdic V (1968) Bazalt kod Zutnice nedaleko Krapine (Hrvatsko Zagorje). Geol vjesnik Zagreb 21: 249–254

    Google Scholar 

  • Golub Lj, Brajdic V (1969) Piroklasticne stijene kod Donjeg Jesenja (Hrvatsko Zagorje). Geol vjesnik Zagreb 22: 11–16

    Google Scholar 

  • Green TH, Pearson NJ (1985) Experimental determination of REE partition coefficients between amphibole and basaltic to andesitic liquids at high pressure. Geochim Cosmochim Acta 49: 1465–1468

    Google Scholar 

  • Hammarstrom JM, Zen E-An (1986) Aluminum in hornblende: an empirical igneous geobarometer. Am Mineral 71: 1297–1313

    Google Scholar 

  • Hart SR, Reid MR (1991) Rb/Cs fractionation: a link between granulite metamorphism and the S-process. Geochim Cosmochim Acta 55: 2379–2383

    Google Scholar 

  • Hildreth W, Moorbath S (1988) Crustal contributions to arc magmatism in the Andes of Central Chile. Contrib Mineral Petrol 98: 455–489

    Google Scholar 

  • Hinterlechner-Ravnik A (1971) Pohorske metamorfne kamenine (The metamorphic rocks of Pohorje). Geologija Ljubljana 14: 187–226

    Google Scholar 

  • Hinterlechner-Ravnik A (1982) Pohorski eklogit (Eclogite from the Pohorje Mountains). Geologija Ljubljana 25: 251–288

    Google Scholar 

  • Hinterlechner-Ravnik A, Moine B (1977) Geochemical characteristics of the metamorphic rocks of the Pohorje Mountains. Geologija Ljubljana 20: 107–140

    Google Scholar 

  • Hinterlechner-Ravnik A, Plenicar M (1967) Smrekovski andezit in njegov tuf. Geologija Ljubljana 10: 219–237

    Google Scholar 

  • Hofmann AW (1988) Chemical differentiation of the Earth: the relationship between mantle, continental crust, and oceanic crust. Earth Planet Sci Lett 90: 297–314

    Google Scholar 

  • Hollister LS, Grissom GC, Peters EK, Stowell HH, Sisson VB (1987) Confirmation of the empirical correlation of Al in hornblende with pressure of solidification of calc-alkaline plutons. Am Mineral 72: 231–239

    Google Scholar 

  • Johnson MC, Rutherford MJ (1989) Experimental calibration of the aluminium-in- hornblende geobarometer with application to Long Valley caldera (California) volcanic rocks. Geology 17: 837–841

    Google Scholar 

  • Juteau M, Michard A, Albarede F (1986) The Pb-Sr-Nd isotope geochemistry of some recent circum-Mediterranean granites. Contrib Mineral Petrol 92: 331–340

    Google Scholar 

  • Kispatic M (1908) Dacit od Mozdjenca kod Novoga Marofa. Rad Jugosl akad znanosti umjetn Zagreb 179: 63–67

    Google Scholar 

  • Kispatic M (1909) Mladje cruptivno kamenje u sjevero-zapadnom dielu Hrvatske. Rad Jugosl akad znanosti umjetn Zagreb 177: 97–154

    Google Scholar 

  • Laubscher HP (1970) Das Alpen-Dinaridenproblem and die Palinspastik der sddlichen Tethys. Geol Rdsch 60: 813–833

    Google Scholar 

  • Laubscher HP (1983) The late Alpine (Periadriatic) intrusions and the Insubric Line. Mem Soc Geol It 26: 21–30

    Google Scholar 

  • Laubscher HP (1988) Material balance in Alpine orogeny. Geol Soc Am Bull 100: 1313–1328

    Google Scholar 

  • Lopez-Escobar L, Frey FA, Vergara M (1977) Andesites and high-alumina basalts from the central-south Chile High Andes: geochemical evidence bearing on their petrogenesis. Contrib Mineral Petrol 63: 199–228

    Google Scholar 

  • Mezger K, Altherr R, Okrusch M, Henjes-Kunst F, Kreuzer H (1985) Genesis of acid/basic rock associations: a case study. The Kallithea intrusive complex, Samos, Greece. Contrib Mineral Petrol 90: 353–366

    Google Scholar 

  • Naney MT (1983) Phase equilibria of rock-forming ferromagnesian silicates in granitic systems. Am J Sci 283: 993–1033

    Google Scholar 

  • Nikitin V (1939) Cizlakit-nova kamenina s Pohorja. Zbornik Prir društva Ljubljana 1: 32–36

    Google Scholar 

  • Peccerillo A, Taylor SR (1976) Geochemistry of Eocene calc-alkaline volcanic rocks from the Kastamonu area, Northern Turkey. Contrib Mineral Petrol 58: 63–81

    Google Scholar 

  • Polinski RK, Eisbacher GH (1992) Deformation partitioning during polyphase oblique convergence in the Karawanken Mountains, southeastern Alps. J Struct Geol 14: 1203–1213

    Google Scholar 

  • Powell R (1984) Inversion of the assimilation and fractional crystallization (AFC) equations; characterization of contaminants from isotope and trace element relationships in volcanic suites. J Geol Soc London 141: 447–452

    Google Scholar 

  • Romick JD, Kay SM, Kay RW (1992) The influence of amphibole fractionation on the evolution of calcalkaline andesite and dacite tephra from the central Aleutians, Alaska. Contrib Mineral Petrol 112: 101–118

    Google Scholar 

  • Rutter MJ, Van der Laan SR, Wyllie PJ (1989) Experimental data for a proposed empirical igneous geobarometer: aluminium in hornblende at 10 kbar pressure. Geology 17: 897–900

    Google Scholar 

  • Scharbert S (1975) Radiometrische Altersdaten von Intrusivgesteinen im Raum Eisenkappel (Karawanken, Kdrnten). Verh Geol Bundesanstalt Wien 1975: 301–304

    Google Scholar 

  • Schmid SM, Zinng A, Handy M (1987) The kinematics of movements along the Insubric Line and the emplacement of the Ivrea Zone. Tectonophysics 135: 47–66

    Google Scholar 

  • Schmid SM, Aebli HR, Heller F, Zingg A (1989) The role of the Periadriatic line in the tectonic evolution of the Alps. In: Coward MP, Dietrich D, Park RG (eds) Alpine tectonics. Geol Soc London Spec Publ. Blackwell, London, pp. 153–171

    Google Scholar 

  • Schmidt MW (1992) Amphibole composition in tonalite as a function of pressure: an experimental calibration of the Al-in-hornblende barometer. Contrib Mineral Petrol 110: 304–310

    Google Scholar 

  • Šimunić A (1986) Geološka gradja okolice Lepoglave i osvrt na pojave mineralnih sirovina. Radovi Zavoda znanstv rad Jugosl akad znanosti umjetn Varazdin 1: 19–32

    Google Scholar 

  • Simunić A, Hećimović I (1979) Tektonski odnosi sjeverozapadne Hrvatske (Ivansćica, Kalnik i Ravna Gora). Zbornik radova Znanstvenog savjeta za naftu Jugosl akad znanosti umjetn, 4. godišnji znanstveni skup Zagreb: 187–198

  • Sun Ss, McDonough WF (1989) Chemical and isotopic systematics of oceanic basalts: implications for mantle composition and processes. In:Saunders AD, Norry MJ (eds) Magmatism in the oceanic basins. Geol Soc Lond Spec Publ No 42. Blackwell, Oxford, pp 313–345

    Google Scholar 

  • Taylor HP (1980) The effects of assimilation of country rocks by magmas on 180/160 and87Sr/86Sr systematics in igneous rocks. Earth Planet Sci Lett 47: 243–254

    Google Scholar 

  • Taylor SR, McLennan SM (1985) The continental crust: its composition and evolution. Blackwell, Oxford, 312pp

    Google Scholar 

  • Thorpe RS, Potts PJ, Francis PW (1976) Rare earth data and petrogenesis of andesite from the North Chilean Andes. Contrib Mineral Petrol 54: 65–78

    Google Scholar 

  • Venturelli G, Thorpe GS, Dal Piaz GV, Del Moro A, Potts PJ (1984) Petrogenesis of calc-alkaline, shoshonitic and associated ultrapotassic Oligocene volcanic rocks from the Northwestern Alps, Italy. Contrib Mineral Petrol 86: 209–220

    Google Scholar 

  • von Blankenburg F (1992) Combined high-precision chronometry and geochemical tracing using accessory minerals: Applied to the Central-Alpine Bergell intrusion (Central Europe). Chem Geol 100: 19–40

    Google Scholar 

  • von Blankenburg F, Früh-Green G, Diethelm K, Stille P (1992) Nd-, Sr-, O-isotopic and chemical evidence for a two-stage contamination history of mantle magma in the Central-Alpine Bergell intrusion. Contrib Mineral Petrol 110: 33–45

    Google Scholar 

  • von Gosen W (1989) Fabric development and the evolution of the Periadriatic Lineament in southeast Austria. Geol Mag 126: 55–71

    Google Scholar 

  • White WM, Dupré B (1986) Sediment subduction and magma genesis in the lesser Antilles: isotopic and trace element constraints. J Geophys Res 91: 5927–5941

    Google Scholar 

  • Wyllie PJ (1981) Plate tectonics and magma genesis. Geol Rdsch 70: 128–153

    Google Scholar 

Download references

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  1. Mineralogisch-Petrographisches Institut, Universität Heidelberg, Im Neuenheimer Feld 236, D-69120, Heidelberg, Germany

    R. Altherr &  H. -P. Meyer

  2. Institute of Mineralogy, Petrology, and Economic Geology, RGN Fakultet, University of Zagreb, Pierottijeva 6/III, HR-41000, Zagreb, Croatia

    B. Lugović &  V. Majer

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Altherr, R., Lugović, B., Meyer, H.P. et al. Early miocene post-collisional calc-alkaline magmatism along the easternmost segment of the periadriatic fault system (Slovenia and Croatia). Mineralogy and Petrology 54, 225–247 (1995). https://doi.org/10.1007/BF01162863

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