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Please use this identifier to cite or link to this item: http://hdl.handle.net/10023/2002
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Title: A short-duration pulse of ductile normal shear on the outer South Tibetan detachment in Bhutan : Alternating channel flow and critical taper mechanics of the eastern Himalaya
Authors: Chambers, Jennifer
Parrish, Randall
Argles, Tom
Harris, Nigel
Horstwood, Matthew
Keywords: Prograde metamorphic reactions
Main central thrust
MC-ICP-MS
U-PB
Continental collision
Lesser himalaya
Monazite
Evolution
Sequence
System
QE Geology
Issue Date: 11-Mar-2011
Citation: Chambers , J , Parrish , R , Argles , T , Harris , N & Horstwood , M 2011 , ' A short-duration pulse of ductile normal shear on the outer South Tibetan detachment in Bhutan : Alternating channel flow and critical taper mechanics of the eastern Himalaya ' Tectonics , vol 30 , pp. TC2005 .
Abstract: In easternmost Bhutan the South Tibetan detachment (STD) is a ductile shear zone that juxtaposes the Radi (or Sakteng) klippe of the Tethyan Sedimentary Series from underlying high-grade Greater Himalayan rocks. In situ LA-ICPMS U-Th-Pb analysis of metamorphic monazite from the immediate footwall and hanging wall of the STD within the shear zone at the base of the klippe, constrains north vergent normal shear to between 25 and 20 Ma. Coeval thrusting on the Main Central Thrust during this time supports a phase of channel flow-viscous wedge model activity, lasting only similar to 3 Ma. Geochronologic data from the eastern Himalaya indicate alternating mechanisms for extrusion of the metamorphic core of the orogen from the Late Oligocene through to the Late Miocene, switching from channel flow-viscous wedge behavior to critical taper-frictional wedge behavior, each phase lasting approximately only 2 to 5 Ma. The tectonic evolution of the eastern Himalaya is comparable to central and western Himalayan tectonics during the Early Miocene, but during the Middle Miocene metamorphism and magmatism in the eastern Himalaya migrated toward the orogenic hinterland, a process not widely documented elsewhere in the Himalaya, thus highlighting the need for an orogenic model in three spatial dimensions. Citation: Chambers, J., R. Parrish, T. Argles, N. Harris, and M. Horstwood (2011), A short-duration pulse of ductile normal shear on the outer South Tibetan detachment in Bhutan: Alternating channel flow and critical taper mechanics of the eastern Himalaya, Tectonics, 30, TC2005, doi:10.1029/2010TC002784.
Version: Publisher PDF
Description: Field work was supported by a NERC Research Studentship field grant.
Status: Peer reviewed
URI: http://hdl.handle.net/10023/2002
DOI: http://dx.doi.org/10.1029/2010TC002784
ISSN: 0278-7407
Type: Journal article
Rights: Copyright (c)2011 by the American Geophysical Union. Deposited 6 months from publication by AGU
Appears in Collections:Earth and Environmental Sciences Research
University of St Andrews Research
Geography & Geosciences Research



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