Eoalpine tectonics of the Eastern Alps: implications from the evolution of monometamorphic Austroalpine units (Schneeberg and Radenthein Complex)
Tóm tắt
Monometamorphic metasediments of Paleozoic or Mesozoic age constituting Schneeberg and Radenthein Complex experienced coherent deformation and metamorphism during Late Cretaceous times. Both complexes are part of the Eoalpine high-pressure wedge that formed an intracontinental suture and occur between the polymetamorphosed Ötztal–Bundschuh nappe system on top and the Texel–Millstatt Complex below. During Eoalpine orogeny Schneeberg and Radenthein Complexes were south-dipping and they experienced a common tectonometamorphic history from ca. 115 Ma onwards until unroofing of the Tauern Window in Miocene times. This evolution is subdivided into four distinct tectonometamorphic phases. Deformation stage D1 is characterized by WNW-directed shearing at high temperature conditions (550–600°C) and related to the initial exhumation of the high-pressure wedge. D2 and D3 are largely coaxial and evolved during high- to medium-temperature conditions (ca. 450 to ≥550°C). These stages are related to advanced exhumation and associated with large-scale folding of the high-pressure wedge including the Ötztal-Bundschuh nappe system above and the Texel–Millstatt Complex below. For the area west of the Tauern Window, F2/F3 fold interference results in the formation of large-scale sheath-folds in the frontal part of the nappe stack (formerly called “Schlingentektonik” by previous authors). Earlier thrusts were reactivated during Late Cretaceous normal faulting at the base of the Ötztal–Bundschuh nappe system and its cover. Deformation stage D4 is of Oligo-Miocene age and accounted for tilting of individual basement blocks along large-scale strike-slip shear zones. This tilting phase resulted from indentation of the Southern Alps accompanied by the formation of the Tauern Window.
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Belocky, R. (1987). Strukturgeologische Untersuchungen in Kristallin und Gurktaler Decke im Raum Radenthein-Bad Kleinkirchheim (Nockgebiet/Kärnten/Österreich). Unpubl. Diploma Thesis, University Vienna, Vienna.
Bernhard, F., Klötzli, U. S., Thöni, M., & Hoinkes, G. (1996). Age, origin and geodynamic significance of a polymetamorphic felsic intrusion in the Ötztal Crystalline Basement, Tirol, Austria. Mineralogy and Petrology, 58, 171–196.
Brückl, E. et al. (2010). Crustal structure and active tectonics in the Eastern Alps. Tectonics, 29, TC2011. doi:10.1029/2009TC002491.
Bunge, H. J. (1981). Fabric analyses by orientation distribution functions. Tectonophysics, 78, 1–21.
Faryad, S. W., & Hoinkes, G. (2003). P-T gradient of Eo-Alpine metamorphism within the Austroalpine basement units east of the Tauern Window (Austria). Mineralogy and Petrology, 77, 129–159.
Frank, W., Hoinkes, G., Purtscheller, F., & Thöni, M. (1987). The Austroalpine Unit West of the Hohe Tauern: The Ötztal–Stubai Complex as an example for the Eoalpine metamorphic evolution. In: W. Flügel & P. Faupl (Eds.), Geodynamics of the Eastern Alps (pp. 179–225). Vienna: Deuticke.
Frimmel, H. (1987). Isotopengeologische Hinweise auf die paläogeographische Nachbarschaft von Gurktaler Decke (Oberostalpin) und dem Altkristallin östlich der Hohen Tauern (Österreich). Schweizerische Mineralogische und Petrographische Mitteilungen, 66, 193–208.
Frimmel, H. (1988). Metagranitoide am Westrand der Gurktaler Decke (Oberostalpin)—Genese und paläotektonische Implikation. Jahrbuch der Geologischen Bundesanstalt, 131, 575–592.
Frisch, W., Dunkl, I., & Kuhlemann, J. (2000). Post-collisional orogen-parallel large-scale extension in the Eastern Alps. Tectonophysics, 327, 239–265.
Froitzheim, N., Conti, P., & van Daalen, M. (1997). Late Cretaceous, synorogenic, low-angle normal faulting along the Schlining fault (Switzerland, Italy, Austria) and its significance for the tectonics of the Eastern Alps. Tectonophysics, 280, 267–293.
Froitzheim, N., Schmid, S. M., & Conti, P. (1994). Repeated change from crustal shortening to orogen—parallel extension in the Austroalpine units of Graubünden. Eclogae geologicae Helvetiae, 87, 559–612.
Fügenschuh, B., Mancktelow, N. S., & Seward, D. (2000). Cretaceous to Neogene cooling and exhumation history of the Oetztal–Stubai basement complex, Eastern Alps; a structural and fission track study. Tectonics, 19, 905–918.
Genser, J., & Neubauer, F. (1989). Low angle normal faults at the eastern margin of the Tauern Window (Eastern Alps). Mitteilungen der Österreichischen Geologischen Gesellschaft, 81, 233–243.
Habler, G., Thöni, M., & Sölva, H. (2006). Tracing the high pressure stage in the polymetamorphic Texel Complex (Austroalpine basement unit, Eastern Alps): P–T–t–d constraints. Mineralogy and Petrology, 88, 269–296.
Hawkesworth, C. J. (1976). Rb/Sr geochronology in the Eastern Alps. Contributions to Mineralogy and Petrology, 54, 225–244.
Helbig, P., & Schmidt, K. (1978). Zur Tektonik und Petrogenese am W-Ende des Schneeberger Zuges (Ostalpen). Jahrbuch der Geologischen Bundesanstalt, 121, 177–217.
Hirth, G., & Tullis, J. (1992). Dislocation creep regimes in quartz aggregates. Journal of Structural Geology, 14, 145–159.
Hirth, G., & Tullis, J. (1994). The brittle-plastic transition in experimentally deformed quartz aggregates. Journal of Geophysical Research, 99, 11731–11747.
Hoinkes, G. (1981). Mineralreaktionen und Metamorphosebedingungen in Metapeliten des westlichen Schneebergerzuges und des angrenzenden Altkristallins (Ötztaler Alpen). Tschermacks Mineralogisch Petrographische Mitteilungen, 28, 31–54.
Hoinkes, G. (1986). Effect of grossular-content in garnet on the partitioning of Fe and Mg between garnet and biotite. An empirical investigation on staurolite-zone samples from the Austroalpine Schneeberg complex. Contributions to Mineralogy and Petrology, 92, 393–399.
Hoinkes, G., Höller, F., Rantitsch, G., Dachs, E., Höck, V., Neubauer, F., et al. (1999). Alpine metamorphism of the Eastern Alps. Schweizer Mineralogische und Petrographische Mitteilungen, 79, 155–181.
Hoinkes, G., Koller, F., Demény, A., Schuster, R., Miller, Ch., Thöni, M., et al. (2010). Metamorphism in the Eastern Alps. Acta Mineralogica-Petrographica, Field Guide Series, 1, 1–47.
Hoinkes, G., Kostner, A., & Thöni, M. (1991). Petrologic constraints for eo-Alpine eclogite facies metamorphism in the Austroalpine Ötztal Basement. Mineralogy and Petrology, 43, 237–254.
Janák, M., Froitzheim, N., Lupták, B., Vrabec, M., & Krogh Ravna, E. J. (2004). First evidence for ultrahigh-pressure metamorphism of Eclogites in Pohorje, Slovenia: Tracing deep continental subduction in the eastern Alps. Tectonics, 23, TC5014. doi:10.1029/2004TC001641.
Justin-Visentin, E., & Zanettin, B. (1965). Gli scisti cristallini dell’alta Val Passiria fra Moso e Passo del Rombo (Alto Adige). R. C. Soc. Mineral. Ital., 21.
Kaindl, R., & Abart, R. (2002). Reequilibration of fluid inclusions in garnet and kyanite from metapelites of the Radenthein Complex, Austroalpine Basement, Austria. Schweizerische Mineralogische und Petrographische Mitteilungen, 82, 467–486.
Kaindl, R., Hoinkes, G., Knoll, P., & Abart, R. (1999). Fluid inclusions related to Variscan and Alpine metamorphism in the Austroalpine Ötztal Basement, Eastern Alps. Mineralogy and Petrology, 65, 29–49.
Kissling, E., Schmid, S. M., Lippitsch, R. Ansorge, J., & Fügenschuh, B. (2006). Lithosphere structure and tectonic evolution of the Alpine arc: new evidence from high-resolution teleseismic tomography. In: D. G. Gee & R. A. Stephenson (Eds.), European lithosphere dynamics (Vol. 32, pp. 129–145). Memoirs: Geological Society of London.
Klötzli-Chowanetz, E., Klötzli, U. S., & Koller, F. (1997). Lower Ordovician migmatisation in the Ötztal crystalline basement (Austria): Linking U/Pb and Pb–Pb dating with zircon morphology. Schweizerische Mineralogische und Petrographische Mitteilungen, 77, 315–324.
Konzett, J., & Hoinkes, G. (1996). Paragonite-hornblende assemblages and their petrological significance: An example from the Austroalpine Schneeberg Complex, Southern Tyrol, Italy. Journal of Metamorphic Geology, 14, 85–101.
Koroknai, B., Neubauer, F., Genser, J., & Topa, D. (1999). Metamorphic and tectonic evolution of Austroalpine units at the western margin of the Gurktal nappe complex, Eastern Alps. Schweizerische Mineralogische und Petrographische Mitteilungen, 79, 277–295.
Krenn, K. (2010). Fluid inclusions in quartz related to subsequent stages of foliation development during a single metamorphic cycle (Schneeberg Fault Zone, Eastern Alps, Austria). Lithos, 118, 255–268.
Krenn, K., Kaindl, R., & Hoinkes, G. (2004). Pumpellyite in metapelites of the Schneeberg Complex (Eastern Alps, Austria): A relict of the eo-Alpine prograde P-T-path? European Journal of Mineralogy, 16, 661–669.
Krohe, A. (1987). Kinematics of Cretaceous nappe tectonics in the Austroalpine basement of the Koralpe region (eastern Austria). Tectonophysics, 136, 171–196.
Kurz, W., & Fritz, H. (2003). Tectonometamorphic evolution of the Austroalpine Nappe Complex in the central Eastern Alps–consequences for the Eo-Alpine evolution of the Eastern Alps. International Geology Review, 45, 1100–11127.
Kurz, W., Fritz, H., Tenczer, V., & Unzog, W. (2002). Tectonometamorphic evolution of the Koralm Complex (Eastern Alps): Constraints from microstructures and textures of the “Plattengneis”—shear zone. Journal of Structural Geology, 24, 1957–1970.
Law, R. D., Schmid, S. M., & Wheeler, J. (1990). Simple shear deformation and quartz crystallographic fabrics: A possible natural example from the Torridon area of NW Scotland. Journal of Structural Geology, 12, 29–54.
Linzer, H. G., Ratschbacher, L., & Frisch, W. (1995). Transpressional collision structures in the upper crust: The fold-thrust belt of the Northern calcareous Alps. Tectonophysics, 242, 41–61.
Lippitsch, R., Kissling, E., & Ansorge, J. (2003). Upper mantle structure beneath the Alpine orogen from high-resolution teleseismic tomography. Journal of Geophysical Research, 108, 2002JB002016.
Lister, G. S., & Hobbs, B. E. (1980). The simulation of fabric developments during plastic deformation and its application to quartzite: The influence of deformation history. Journal of Structural Geology, 2, 355–370.
Liu, Y., Genser, J., Handler, R., Friedl, G., & Neubauer, F. (2001). 40Ar/39Ar muscovite ages from the Penninic-Austroalpine plate boundary, Eastern Alps. Tectonics, 20, 526–547.
Mancktelow, N. S., Stöckli, D. F., Grollimund, B., Müller, W., Fügenschuh, B., Viola, G., Seward, D., & Villa, I. M. (2001). The DAV and Periadriatic fault systems in the Eastern Alps south of the Tauern window. International Journal of Earth Science, 90, 593–622.
Mauracher, J. (1980). Alpidische und voralpidische Metamorphose und Strukturprägung am Westende des Schneeberger Zuges (Ötztaler Alpen). Unpublished PhD Thesis, Vienna University, Vienna.
Miller, Ch., & Thöni, M. (1995). Origin of eclogites from the Austroalpine Ötztal basement (Tirol, Austria): Geochemistry and Sm-Nd vs. Rb-Sr isotope systematics. Chemical Geology, 122, 199–225.
Müller, W., Prosser, G., Mancktelow, N. S., Villa, I., Kelley, S. P., Viola, G., et al. (2001). Geochronological constraints on the evolution of the Periadriatic Fault System (Alps). International Journal of Earth Science (Geologische Rundschau), 90, 623–653.
Neubauer, F., Frisch, W. B. T., & Hansen, B. T. (1987). Time relations between Eoalpine metamorphism and thrusting: Evidence from the crystalline basement of the eastern Greywacke Zone. In: H. W. Flügel & P. Faupl (Eds.), Geodynamics of the Eastern Alps (pp. 263–271). Vienna: Deuticke.
Neubauer, F., Genser, J., & Handler, R. (2000). The Eastern Alps: Result of a two-stage collision process. Mitteilungen der Österreichischen Geologischen Gesellschaft, 92, 117–134.
Neubauer, F., Hoinkes, G., Sassi, F. P., Handler, R., Höck, V., Koller, F., et al. (1999). Pre-Alpine metamorphism of the Eastern Alps. Schweizerische Mineralogische Petrographische Mitteilungen, 79, 41–62.
Oberhauser, R. (1980). Der Geologische Aufbau Österreichs. Wien: Geologische Bundesanstalt.
Polinski, R. F., & Eisbacher, G. H. (1992). Deformation partitioning during polyphase oblique convergence in the Karawanken Mountains, southeastern Alps. Journal of Structural Geology, 14, 1203–1213.
Puhr, B., Hoinkes, G., Proyer, A., & Schuster, R. (2009). Petrology of metacarbonate rocks of the Austroalpine basement east of the Tauern Window (Austria). Mitteilungen der Österreichischen Mineralogischen Gesellschaft, 155, p. 134.
Purtscheller, F. (1978). Ötztaler und Stubaier Alpen. Sammlung Geologischer Führer 53, 2. Aufl., Gebrüder Borntraeger, Berlin.
Purtscheller, F., & Rammlmair, D. (1982). Alpine Metamorphism of Diabase dikes in the Ötztal–Stubai Metamorphic Complex. Tschermacks Mineralogische Petrographische Mitteilungen, 29, 205–221.
Ramsay, J. G., & Huber, M. I. (1987). The techniques of modern structural geology (Vol. 2). London: Academic Press.
Ratschbacher, L. (1986). Kinematics of Austroalpine cover nappes: Changing translation to transpression. Tectonophysics, 125, 335–356.
Ratschbacher, L., & Neubauer, F. (1989). West-directed decollement of Austro-Alpine cover nappes in the eastern Alps: Geometrical and rheological considerations. In: M. P. Coward, D. Dietrich & R. G. Park (Eds.), Alpine tectonics (pp. 243–262). Geological Society Special Publication, London.
Roe, R. J. (1965). Description of crystallite orientation in polycrystalline materials. III. General solution to the pole figure inversion. Journal of Applied Physics, 36, 2024–2031.
Schimana, R. (1986). Geologische Entwicklung des Kristallins in der Umgebung um Radenthein (Nockgebirge/Kärnten). Unpublished PhD Thesis. University Vienna, Vienna.
Schmid, S. M., & Casey, M. (1986). Complete fabric analysis of some commonly observed quartz c-axis patterns. Geophysical Monography, 36, 263–286.
Schmid, S. M., Fügenschuh, B., Kissling, E., & Schuster, R. (2004). Tectonic map and overall architecture of the Alpine orogen. Eclogae geologicae Helvetiae, 97, 93–117.
Schmid, S. M., & Haas, R. (1989). Transition from near surface thrusting to intrabasement decollement, Schlinig thrust, Eastern Alps. Tectonics, 8, 697–718.
Schmidegg, O. (1964). Die Ötztale Schubmasse und ihre Umgebung (pp. 27–47). Wien: Verhandlungen der geologischen Bundesanstalt.
Schuster, R., & Frank, W. (1999). Metamorphic evolution of the Austroalpine units east of the Tauern Window: Implications for Jurassic strike-slip tectonics. Mitteilungen der Gesellschaft der Geologie-und Bergbaustudenten Österreichs, 42, 37–58.
Schuster, R., Koller, F., Hoeck, V., Hoinkes, G., & Bousquet, R. (2004). Explanatory notes to the map: Metamorphic structure of the Alps–Metamorphic evolution of the Eastern Alps. Mitteilungen der Österreichischen Mineralogischen Gesellschaft, 149, 175–199.
Schuster, R., & Stüwe, K. (2008). Permian metamorphic event in the Alps. Geology, 36, 603–606.
Sölva, H., Grasemann, B., Thöni, M., Thiede, R., & Habler, G. (2005). The Schneeberg Normal Fault Zone: Normal faulting associated with Cretaceous SE-directed extrusion in the Eastern Alps (Italy, Austria). Tectonophysics, 401, 143–166.
Sölva, H., Thöni, M., Grasemann, B., & Linner, M. (2001). Emplacement of eo-Alpine high-pressure rocks in the Austroalpine Ötztal complex (Texel group, Italy/Austria). Geodinamica Acta, 14, 345–360.
Spiess, R. (1995). The Passeier–Jaufen Line: A tectonic boundary between Variscan and an eo-Alpine Meran-Mauls basement. Schweizerische Mineralogische Petrographische Mitteilungen, 75, 413–425.
Teiml, X., & Hoinkes, G. (1996). Der P-T Pfad d3er Millstätter Serie und ein Vergleich mit dem südlichen Ötztal–Stubai–Kristallin. Mitteilungen der Österreichischen Mineralogischen Gesellschaft, 141, 228–229.
Teiml, X., Hoinkes, G., & Konzett, J. (1995). Joint occurrence of eclogites and white mica-amphibolites in the Austroalpine Basement (Eastern Alps). Terra Nova, Abstracts Suppl., 1, 318.
Thöni, M. (1981). Degree and evolution of the Alpine Metamorphism in the Austroalpine Unit W of the Tauern Window in light of K/Ar and Rb/Sr age determinations on Micas. Jahrbuch der Geologischen Bundesanstalt, 124, 111–174.
Thöni, M. (1999). A review of geochronological data from the Eastern Alps. Schweizerische Mineralogisch Petrographische Mitteilungen, 79, 209–230.
Thöni, M., Miller, C., Blichert-Toft, J., Whitehouse, M. J., Konzett, J., & Zanetti, A. (2008). Timing of high-pressure metamorphism and exhumation of the eclogite type-locality (Kupplerbrunn–Prickler Halt, Saualpe, south-eastern Austria): Constraints from correlations of the Sm-Nd, Lu-Hf, U-Pb and Rb-Sr isotopic systems. Journal of Metamorphic Geology, 26, 561–581.
Tollmann, A. (1977). Geologie von Österreich. Band 1. Wien: Die Zentralalpen.
Tropper, P., & Hoinkes, G. (1996). Geothermobarometry of Al2SiO5 bearing metapelites in the western Austroalpine Ötztal basement. Mineralogy and Petrology, 58, 145–170.
Viola, G., Mancktelow, N., Seward, D., Meier, A., & Martin, S. (2003). The Pejo fault system; an example of multiple tectonic activity in the Italian Eastern Alps. Geological Society of America Bulletin, 115, 515–532.
Vissers, R. L. M. (1989). Asymmetric quartz c-axis fabric and flow vorticity: A study using rotated garnets. Journal of Structural Geology, 11, 231–244.
Wallis, S. R. (1992). Vorticity analysis in a metachert from the Sanbagawa Belt, SW Japan. Journal of Structural Geology, 14, 271–280.
Wenk, H. R. (1985). Measurements of pole figures. In: H. R. Wenk (Eds.), An introduction to modern texture analysis (pp. 11–47). Orlando: Academic Press.
Wiesinger, M., Neubauer, F., & Handler, R. (2006). Exhumation of the Saualpe eclogite unit, Eastern Alps: Constraints from 40Ar/39Ar ages and structural investigations. Mineralogy and Petrology, 88, 149–180.
Zanchetta, S., Salvi, F., Zanchi, A., & Poli, S. (2007). Structural aspects of the Texel–Schneeberg boundary in the Pfossen valley (Central-Eastern Alps, NE Italy). Mitteilungen der Österreichischen Mineralogischen Gesellschaft 153.
Zanchi, A., Francesca, S., Stefano, Z., Simone, S., & Graziano, G. (2009). 3D reconstruction of complex geological bodies: Examples from the Alps. Computers and Geosciences, 35, 49–69.
Zanettin, B., & Justin-Visentin, E. (1971). Considerzioni Geologico-Petrologiche Sul “tratto di Monteneve” (“Schneeberger Gesteinszug”) (Alto Adige). Padova: Mem. Ist. Geol. e Miner. Univ. Padova.