Interplay between subduction retreat and lateral extrusion: Tectonics of the Western Carpathians

Interplay between subduction retreat and lateral extrusion: Tectonics of the Western Carpathians Analysis of brittle microstructures reveals three Tertiary deformation events in the Western Carpathians: (1) Late Paleogene bedding‐parallel extension; (2) Oligocene (?) to middle Miocene NNE‐SSW compression and ESE‐WNW extension; (3) post‐mid‐Miocene NW‐SE extension. These regional deformations, applied to crustal blocks in the intra‐Carpathian region, resulted from forces which were induced by the coupled plate tectonic processes of subduction retreat beneath the Carpathian arc and lateral extrusion from the Eastern Alps toward the Carpathian region. Material flow from the Alps spread toward east and NE, guided by sinistral strike‐slip zones along the NE trending continental margin. Subduction retreat was terminated by mid‐Miocene “soft” collision of the Inner Western Carpathians with the European foreland. Ongoing subduction retreat beneath the Eastern Carpathians caused post‐mid‐Miocene back arc extension forming the Pannonian basin. Extension spread into the Western Carpathians by reactivating the extrusion‐related strike‐slip faults as normal faults. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Tectonics Wiley

Interplay between subduction retreat and lateral extrusion: Tectonics of the Western Carpathians

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Publisher
Wiley
Copyright
Copyright © 2002 by the American Geophysical Union.
ISSN
0278-7407
eISSN
1944-9194
DOI
10.1029/2001TC901028
Publisher site
See Article on Publisher Site

Abstract

Analysis of brittle microstructures reveals three Tertiary deformation events in the Western Carpathians: (1) Late Paleogene bedding‐parallel extension; (2) Oligocene (?) to middle Miocene NNE‐SSW compression and ESE‐WNW extension; (3) post‐mid‐Miocene NW‐SE extension. These regional deformations, applied to crustal blocks in the intra‐Carpathian region, resulted from forces which were induced by the coupled plate tectonic processes of subduction retreat beneath the Carpathian arc and lateral extrusion from the Eastern Alps toward the Carpathian region. Material flow from the Alps spread toward east and NE, guided by sinistral strike‐slip zones along the NE trending continental margin. Subduction retreat was terminated by mid‐Miocene “soft” collision of the Inner Western Carpathians with the European foreland. Ongoing subduction retreat beneath the Eastern Carpathians caused post‐mid‐Miocene back arc extension forming the Pannonian basin. Extension spread into the Western Carpathians by reactivating the extrusion‐related strike‐slip faults as normal faults.

Journal

TectonicsWiley

Published: Dec 1, 2002

References

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