Late Cretaceous exhumation of the metamorphic Gleinalm dome, Eastern Alps: kinematics, cooling history and sedimentary response in a sinistral wrench corridor

Late Cretaceous exhumation of the metamorphic Gleinalm dome, Eastern Alps: kinematics, cooling... The metamorphic Gleinalm dome, Eastern Alps, was uplifted and exhumed within a releasing structure in a sinistral wrench corridor during the Late Cretaceous. The dome is confined by a system of ductile shear zones including low-angle normal faults and steep sinistral tear faults which define a large releasing structure with the metamorphic dome in its center. The fabrics developed within all ductile shear zones record processes which were operating during decreasing temperatures from initial epidote-amphibolite/upper greenschist facies conditions (with crystal plastic fabrics in quartz) to temperatures below ca. 300°C (with predominantly cataclastic fabrics). A cooling path based on 40 Ar/ 39 Ar amphibole (95.4 ± 1.2 Ma) and muscovite ages (87.6 ± 0.6; 84.3 ± 0.7 Ma) together with sphene, zircon and apatite fission track data indicate cooling through ca. 500°C at ca. 94 Ma to below ca. 250-200°C at 65 Ma. Subsidence of the adjacent Late Cretaceous Kainach Gosau basin occurred synchronously with cooling and uplift of the Gleinalm dome. Internal depositional patterns record rapid subsidence at the time of cooling with internal synsedimentary block rotation above an intra-crustal ductile normal fault. The sinistral wrench corridor of the Eastern Alps developed by sinistral displacement of the Austroalpine units against a relatively stable Europe during the Late Cretaceous. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Tectonophysics Elsevier

Late Cretaceous exhumation of the metamorphic Gleinalm dome, Eastern Alps: kinematics, cooling history and sedimentary response in a sinistral wrench corridor

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Publisher
Elsevier
Copyright
Copyright © 1995 Elsevier Ltd
ISSN
0040-1951
eISSN
1879-3266
DOI
10.1016/0040-1951(94)00154-2
Publisher site
See Article on Publisher Site

Abstract

The metamorphic Gleinalm dome, Eastern Alps, was uplifted and exhumed within a releasing structure in a sinistral wrench corridor during the Late Cretaceous. The dome is confined by a system of ductile shear zones including low-angle normal faults and steep sinistral tear faults which define a large releasing structure with the metamorphic dome in its center. The fabrics developed within all ductile shear zones record processes which were operating during decreasing temperatures from initial epidote-amphibolite/upper greenschist facies conditions (with crystal plastic fabrics in quartz) to temperatures below ca. 300°C (with predominantly cataclastic fabrics). A cooling path based on 40 Ar/ 39 Ar amphibole (95.4 ± 1.2 Ma) and muscovite ages (87.6 ± 0.6; 84.3 ± 0.7 Ma) together with sphene, zircon and apatite fission track data indicate cooling through ca. 500°C at ca. 94 Ma to below ca. 250-200°C at 65 Ma. Subsidence of the adjacent Late Cretaceous Kainach Gosau basin occurred synchronously with cooling and uplift of the Gleinalm dome. Internal depositional patterns record rapid subsidence at the time of cooling with internal synsedimentary block rotation above an intra-crustal ductile normal fault. The sinistral wrench corridor of the Eastern Alps developed by sinistral displacement of the Austroalpine units against a relatively stable Europe during the Late Cretaceous.

Journal

TectonophysicsElsevier

Published: Feb 15, 1995

References

  • Exhumation of high-pressure rocks: a review of concepts and processes
    Platt, J.P.
  • Lateral extrusion in the Eastern Alps, Part 2. Structural analysis
    Ratschbacher, L.; Frisch, W.; Linzer, H.G.; Merle, O.
  • Subduction tectonic erosion and Late Cretaceous subsidence along the northern Austroalpine margin (Eastern Alps, Austria)
    Wagreich, M.

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