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The Tauern Window (Eastern Alps, Austria): a new tectonic map, with cross-sections and a tectonometamorphic synthesis |
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| Authors: | Stefan M Schmid Andreas Scharf Mark R Handy Claudio L Rosenberg |
| Institution: | 1. Institut für Geologische Wissenschaften, Freie Universit?t, Malteserstrasse 74-100, 12249, Berlin, Germany 2. Institut für Geophysik ETH, Sonneggstrasse 5, 8092, Zürich, Switzerland 3. Institut des Sciences de la Terre de Paris, Université Pierre et Marie Curie Paris 6, 4 place Jussieu, 75252, Paris Cedex 05, France |
| Abstract: | We present a tectonic map of the Tauern Window and surrounding units (Eastern Alps, Austria), combined with a series of crustal-scale cross-sections parallel and perpendicular to the Alpine orogen. This compilation, largely based on literature data and completed by own investigations, reveals that the present-day structure of the Tauern Window is primarily characterized by a crustal-scale duplex, the Venediger Duplex (Venediger Nappe system), formed during the Oligocene, and overprinted by doming and lateral extrusion during the Miocene. This severe Miocene overprint was most probably triggered by the indentation of the Southalpine Units east of the Giudicarie Belt, initiating at 23–21 Ma and linked to a lithosphere-scale reorganization of the geometry of mantle slabs. A kinematic reconstruction shows that accretion of European lithosphere and oceanic domains to the Adriatic (Austroalpine) upper plate, accompanied by high-pressure overprint of some of the units of the Tauern Window, has a long history, starting in Turonian time (around 90 Ma) and culminating in Lutetian to Bartonian time (45–37 Ma). |
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