Archimedes revisited: a structural test of eclogite emplacement models in the Austrian Alps |
| |
| Authors: | JH Behrmann L Ratschbacher |
| |
| Institution: | IGL, Universität Giessen, Senckenbergstr. 3, 06300 Giessen, FRG;Geologisches Institut, Universität Tübingen, Sigwartstr. 10, 07400 Täbingen, FRG. |
| |
| Abstract: | High-pressure rocks of the eclogite zone (Tauern Window, Eastern Alps) formed at 20 kb/600°C. Uplift was fast without post-burial heating. Extensive near-field and far-field deformation of the eclogite zone and its surroundings provide evidence for a tectonic uplift mechanism. Published emplacement models (buoyant rise, underplating and extension, wrench faulting) create distinct patterns of crustal deformation, and are therefore testable by structural analysis. We show that emplacement-related deformation and its kinematics are consistent with underplating and extension. Extension is two-phased. The first phase may be driven by changes in rate or direction of plate convergence. The second phase is due to large-scale underplating of continental crust. |
| |
| Keywords: | |
|
|
