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Evidence for steady fault-accommodated strain in the High Himalaya: Progressive fault rotation of the southern Tibet detachment system in NW Bhutan

By
G. Wiesmayr
G. Wiesmayr
1
Institut für Geologie, Universität Wien, Austria
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M. A. Edwards
M. A. Edwards
1
Institut für Geologie, Universität Wien, Austria
2
Asian Tectonics Research Unit, Institut für Geologie, TU-Bergakademie Freiberg, Germany
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M. Meyer
M. Meyer
1
Institut für Geologie, Universität Wien, Austria
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W. S. F. Kidd
W. S. F. Kidd
3
Department of Geological Sciences, State University of New York at Albany, Albany NY 12222, USA
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D. Leber
D. Leber
1
Institut für Geologie, Universität Wien, Austria
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H. Häusler
H. Häusler
1
Institut für Geologie, Universität Wien, Austria
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D. Wangda
D. Wangda
4
Geological Survey of Bhutan, Ministry of Trade and Industry, Thimphu, Bhutan
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Published:
January 01, 2002

Abstract

We present fault analyses from the exhumed middle crustal slab of the High Himalaya in eastern Lunana in NW Bhutan. Fault planes from within two-mica, tourma-line-bearing leucogranites, leucogranitic rocks and migmatites indicate a complex brittle fault pattern with two distinct fault groups. A first group of faults (D1) characterized by chlorite, quartz and tourmaline slickenfibres is mainly defined by steeply SSE-dipping oblique-slip normal faults, and by shallowly NNW-dipping normal faults. A second, younger group of faults (D2) characterized by cataclasis products comprises strike-slip faults displaying conjugate patterns and E- and W-dipping conjugate normal faults, all which indicate E-W extension. Cross-cutting relationships amongst the D1 fault group demonstrate that progressively steeper members of the fault group become younger within the NNW-dipping faults and become older within the SSE-dipping faults. These are all post-dated by the D2 fault group. The D1 fault group indicates that the slab experienced ongoing NNW-SSE extension (i.e. flow) via brittle fault accommodation, contemporaneous with fault rotation. This may reflect rotation of the entire upper orogen due to movement over deeply located major ramp structures formed by out-of-sequence thrusting (Kakhtang Thrust) within the High Himalayan Slab of the Bhutan Himalaya.

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Geological Society, London, Special Publications

Deformation Mechanisms, Rheology and Tectonics: Current Status and Future Perspectives

S. de Meer
S. de Meer
Utrecht University, The Netherlands
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M. R. Drury
M. R. Drury
Utrecht University, The Netherlands
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J. H. P. de Bresser
J. H. P. de Bresser
Utrecht University, The Netherlands
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G. M. Pennock
G. M. Pennock
Utrecht University, The Netherlands
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Geological Society of London
Volume
200
ISBN electronic:
9781862396081
Publication date:
January 01, 2002

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