ISSN
print 2570-7337
online 2570-7345
Petrography and mineral chemistry of metaultramafics in the Austroalpine Sieggraben structural complex at Sieggraben and Schwarzenbach, Austria
Keywords
Abstract
The Sieggraben structural complex occupies a middle position (the former Middle Austroalpine Unit) in the Austroalpine basement nappe system in the Eastern Alps. It is reported as a part of the Upper Austroalpine Unit and is located in the Rosalien Mountains between the Sieggraben and Schwarzenbach villages (approximately 80 km south of Vienna). Our main goal is to precisely determine the petrography and mineral chemistry of lensoidal metaultramafic bodies in metapelites (micaschists to gneisses, migmatitic gneisses), metabasites (eclogites, amphibolites, metagabbros), impure metacarbonates to calc-silicate rocks (marbles), crosscut by veins of granitic orthogneisses (leucocrate metagranites, metapegmatites) in a pre-Alpine basement complex. Mineral assemblages from representative microstructures of massive to strongly schistose metaultramafics were studied by polarized-light microscopy and mineral chemical compositions were determined by Cameca SX-100 electron microprobe. Part of the metaultramafics preserves a mineral assemblage characterized by a higher content of olivine (forsterite) and orthopyroxene (enstatite) relics from the inferred eclogite facies metamorphic stage (D1). Antigorite, Ca-amphibole (tremolite) and Mg-rich chlorite (1) with chromite as the main matrix in the exhumation amphibolite facies metamorphic stage (D2); and chrysotile, Mg-rich chlorite (2), magnetite, rare talc and carbonates in the greenschist facies metamorphic stage (D3). Clinopyroxene is absent. The studied metaultramafics are mantle fragments emplaced in a subducted continetal crust most likely due to the Cretaceous subduction-collision event reported from this basement.
Files
References
Arai S. (1994) Characterization of spinel peridotites by olivine-spinel compositional relationships: review and interpretation. Chem. Geol. 113, 191-204.
Bodinier J. L., Godard M. (2007) Orogenic, Ophiolitic, and Abyssal Peridotites. TrGeo 2.04, 1-73.
Bucher K., Grapes R. (2011) Petrogenesis of Metamorphic Rocks. Springer-Verlag, Berlin, Heidelberg, 8th ed., 1-428.
Dallmeyer R. D., Neubauer F., Handler R., Fritz H., Muller W., Pana D., Putiš M. (1996) Tectonothermal evolution of the internal Alps and Carpathians: evidence from 40Ar/39Ar mineral and whole-rock data. Eclogae Geol. Helv. 89, 1, 203-227.
Dallmeyer R. D., Neubauer F., Handler R., Muller W., Fritz H., Antonitsch W., Hermann S. (1992) 40Ar/39Ar and Rb-Sr mineral age controls for the Pre-Alpine and Alpine tectonic evolution of the Austro-Alpine napple complex, Eastern Alps. In: Neubauer F. (Ed.): ALCAPA-Field Guide, University Graz, 47-59.
Frank W., Kralik M., Scharbert S., Thöni M. (1987) Geochronological data from the Eastern Alps. In: Flugel H. W., Faupl P. (Eds.): Geodynamics of the Eastern Alps. F. Deuticke, Vienna, 272-281.
Frisch W., Neubauer F. (1989) Pre-Alpine terrenes and tectonic zoning in the Eastern Alps. In: Dallmayer R.D. (Ed.): Terranes in the Circum-Atlantic Paleozoic orogens. Special Paper, Geol. Soc. Am. 230, 91-100.
Froitzheim N., Schmid S. M., Frey M. (1996) Mesozoic paleogeography and the timing of eclogite-facies metamorphism in the Alps: A working hypothesis. Eclogae Geol. Helv. 89, 81-110.
Hawthorne C. F., Oberti R., Harlow G., Maresch V. W., Schumaher C. J., Welch M. (2012) Nomenclature of the amphibole supergroup. Am. Mineral. 97, 2031-2048.
Hrvanović S., Putiš M., Bačík P. (2013a) Metaultramafics in the eclogitic Sieggraben complex (Eastern Alps), Univerzita Komenského v Bratislave, Prírodovedecká fakulta, ŠTUDENTSKÁ Vedecká konferencia PriF UK 2013 Zborník recenzovaných príspevkov.1253-1258.
Hrvanović S., Putiš M., Bačík P., Kromel J. (2013b) Petrological characterization of metaultramafics in the Sieggraben complex (Eastern Alps). Univerzita Komenského v Bratislave, MINPET 2013.
Korikovsky S. P., Putiš M., Kotov A. B., Salnikova E. B., Kovach V. P. (1998) High-pressure metamorphism of the phengite gneisses of the Lower Austroalpine nappe complex in the Eastern Alps: mineral equilibria, P-T parameters, and age. Petrology 6, 603-619.
Kromel J., Putiš M., Bačík P. (2011) The Middle Austro-Alpine Sieggraben structural complex - new data on geothermobarometry. Acta Geol. Slovaca 3, 1-12.
Kümel F. (1935) Die Sieggrabener Deckscholle im Rosaliengebirge (Nieder Österreich-Burgenland). Tschermaks Mineral. Petrogr. Mitt. 47, 141-184.
Leake B. E., Woolley A. R., Arps C. E. S., Birch W. D., Gilbert M. C., Grice J. D., Hawthorne F. C., Kato A., Kisch H. J., Krivovichev V. G., Linthout K., Laird J., Mandarino J. A., Maresch W. V., Nickel E. H., Schumacher J. C., Smith D. C., Stephenson N. C. N., Ungaretti L., Whittaker E. J. W., Youzhi G. (1997) Nomenclature of Amphiboles. Can. Mineral. 35, 219-246.
Leake B. E., Woolley A. R., Birch W. D., Burke E. A. J., Ferraris G., Grice J. D., Hawthorne F. C., Kisch H. J., Krivovichev V. G., Schumacher J. C., Stephenson N. C. N., Whittaker E. J. W. (2004) Nomenclature of amphiboles: Additions and revisions to the International Mineralogical Associationʼs amphibole nomenclature. Am. Mineral. 89, 883-887.
Lindsley D. H. (1991) Oxide minerals: petrologic and magnetic significance. Rev. Mineral. 25, 509 pp.
Matte P. (1986) Tectonics and plate tectonics model for the Variscan belt of Europe. Tectonophysics 126, 2-4, 329-374.
Matte P. (1991) Accretionary history and crustal evolution of the Variscan Belt in Western Europe. Tectonophysics 196, 3-4, 309-337.
Morimoto N., Fabries J., Ferguson A. K., Ginzburg I. V., Ross M., Seifert F. A., Zussman J. (1988) Nomenclature of pyroxenes. Am. Mineral. 73, 1123-1133.
Neubauer F. (1994) Kontinentkollision in den Ostalpen. Geowiss. 12, 136-140.
Neubauer F., Frisch W. (1993) The Austro-Alpine metamorphic basement east of the Tauern Window. In: von Raumer J. F., Neubauer F. (Eds.): The Pre-Mesozoic geology of the Alps. Springer Verlag, Heidelberg, 515-535.
Neubauer F., Müller W., Peindl P., Mozschewitz E., Wallbrecher E., Thöni M. (1992) Evolution of lower Austroalpine units along the eastern margins of the Alps: a review. In: Neubauer F. (Ed.): ALCAPA-Field Guide. University Graz, 97-114.
Page N. J. (1968) Chemical differences among the serpentine “polymorphs”. Am. Mineral. 53, 201-201.
Putiš M. (1992) Bericht 1991 Über geologische Aufnahmen im kristallinen Grundgebirge auf Blatt 107 Mattersburg. Jahrb. Geol. Bundesanst. 135, 725-726.
Putiš M., Korikovsky S. P. (1993) From subduction to uplift history: metamorphism, thrust and extensional tectonics of the Sieggraben unit, E. Alps. Terra abstracts, Abstract Supplement No. 2 to Terra Nova 5, 28.
Putiš M., Korikovsky S. P. (1995) Rheological/petrological path of the eclogite-, marble-, gneiss-bearing complexes during extensional uplift (the Sieggraben unit, Middle Austroalpine, Eastern Alps). In: Schulmann K., Vrána S. (Eds.): Thermal and Mechanical Interactions in Deep Seated Rocks, Journal of the Czech Geological Society, Abstract 40, 3, 38-39.
Putiš M., Korikovsky S. P., Pushkarev Y. D. (2000) Petrotectonics of an Austroalpine eclogite-bearing complex (Sieggraben, Eastern Alps) and U-Pb dating of exhumation. Jahrb. Geol. Bundesanst. 142, 73-93.
Putiš M., Korikovsky S. P., Pushkarev Y. D., Zakariadze G. S. (1994) Geology, tectonics, petrology, geochemistry and isotope dating of the Sieggraben (Grobgneis and Wechsel) Unit in the Eastern Alps. Manuscript, Geological Survey of Austria, Vienna, 154 p.
Putiš M., Korikovsky S. P., Wallbrecher E., Unzog W., Olesen N. O., Fritz H. (2002) Evolution of an eclogitized continental fragment in the Eastern Alps (Sieggraben, Austria). J. Struct. Geol. 24, 2, 339-357.
Schmid M., Fügenschuh B., Kissling E., Schuster R. (2004) Tectonic map and overall architecture of the Alpine orogen. Eclogae geol. Helv. 97, 93-117.
Thöni M., Jagoutz E. (1993) Isotopic constraints for eo-Alpine high-P metamorphism in the Austroalpine nappes of the Eastern Alps: Its Bearing on Alpine orogenesis. Schweiz. Mineral. Petrogr. Mitt. 73, 177-189.
Tollmann A. (1977) Geologie von Östtereich. Band I: Die Zentralalpen. Deuticke, Vienna.
Tollmann A. (1980) Geology and tectonics of the Eastern Alps (Middle Sector). Abh. Geol. Bundesanst. Wien 34, 197-255.
Whitney D. L., Evans B. W. (2010) Abbreviations for names of rock-forming minerals. Am. Mineral. 95, 185-187.
Zane A., Weiss Z. (1998) A procedure for classifying rock-forming chlorites based on microprobe data. Rend. Fis. Acc. Lincei 9, 1, 51-56.