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Kinematic evolution of the eastern Tethyan Himalaya: constraints from magnetic fabric and structural properties of the Triassic flysch in SE Tibet

By
Borja Antolín
Borja Antolín
Institute for Geosciences,University of TuebingenSigwartstrasse 10, 72076 Tuebingen,Germany
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Erwin Appel
Erwin Appel
Institute for Geosciences,University of TuebingenSigwartstrasse 10, 72076 Tuebingen,Germany
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Chiara Montomoli
Chiara Montomoli
Department of Earth Sciences,University of Pisavia S. Maria 53, 56126 Pisa,Italy
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István Dunkl
István Dunkl
Institute for Geosciences,University of GöttingenGoldschmidtstrasse 3, D-37077 Göttingen,Germany
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Lin Ding
Lin Ding
Institute of Tibetan Plateau Research, Chinese Academy of SciencesShuangqing Rd. 18, Beijing 100085,China
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Richard Gloaguen
Richard Gloaguen
Department of Geology,Technical University of FreibergBernhard-von-Cottastrasse 2, 09596 Freiberg,Germany
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Rachida El Bay
Rachida El Bay
Institute for Geosciences,University of TuebingenSigwartstrasse 10, 72076 Tuebingen,Germany
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Published:
January 01, 2011

Abstract

Anisotropy of magnetic susceptibility (AMS) combined with structural analysis are used in this work with the aim to characterize the tectonic evolution of the Triassic flysch within the eastern Tethyan Himalaya Thrust Belt in SE Tibet. The attitude of the magnetic foliation and lineation are concordant with the planar and linear structures of tectonic origin defined by the preferred orientation of the iron-bearing silicates. Two different tectonic domains can be defined: (a) the southern domain is controlled by the Eohimalayan tectonic foliation (S1) recorded in the magnetic foliation which trends east–west and dips to the north; (b) the northern domain is dominated by the Neohimalayan magnetic foliation with WNW–ESE strike and dips to the south opposite to the vergence of the main structures. A slightly prolate magnetic ellipsoid has been found in between the two domains recording the intersection of S1 and the subtle development of the S2 tectonic foliation. Hinterland propagation of the deformation lead to the Great Counter backthrust generation, pointed out by the SSW steeply plunging magnetic lineation. Furthermore different orientations of magnetic foliation may indicate an Early Miocene c. 20° clockwise vertical-axis rotation.

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Contents

Geological Society, London, Special Publications

Kinematic Evolution and Structural Styles of Fold-and-Thrust Belts

J. Poblet
J. Poblet
Universidad de Oviedo, Spain
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R. J. Lisle
R. J. Lisle
Cardiff University, UK
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Geological Society of London
Volume
349
ISBN electronic:
9781862395978
Publication date:
January 01, 2011

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