DOI: 10.1007/s00531-012-0861-5
Scopus记录号: 2-s2.0-84884419089
论文题名: Higher Himalaya in the Bhagirathi section (NW Himalaya, India): Its structures, backthrusts and extrusion mechanism by both channel flow and critical taper mechanisms
作者: Mukherjee S.
刊名: International Journal of Earth Sciences
ISSN: 14373254
出版年: 2013
卷: 102, 期: 7 起始页码: 1851
结束页码: 1870
语种: 英语
英文关键词: Backthrusting
; Brittle shear
; Channel flow
; Critical taper mechanism
; Ductile shear
; Exhumation
; Extrusion
; Higher Himalayan Crystalline
; South Tibetan Detachment System
Scopus关键词: brittle deformation
; channel flow
; deformation mechanism
; ductile deformation
; Eurasian plate
; exhumation
; extrusion
; Indian plate
; shear
; structural geology
; subduction zone
; thrust
; Bhagirathi River [Uttarakhand]
; India
; Uttarakhand
英文摘要: The Higher Himalayan Crystalline (HHC) in the Bhagirathi river section (India) on fieldwork reveals two extensional ductile top-to-N/NE shear sub-zones-the 'South Tibetan Detachment System' and the 'Basal Detachment'-besides a preceding top-to-S/SW ductile shear. A top-to-N/NE brittle shear was identified as backthrusts from the HHC (except its northern portion) that occur repeatedly adjacent to numerous top-to-S/SW brittle shears as fore-thrusts. The northern portion of the HHC-the Gangotri Granite-exhibits infrequent total six extensional and compressional brittle shear senses. The backthrusts could be due to a low friction between the lower boundary of the HHC (i.e. the Main Central Thrust-Zone) and the partially molten hot rock materials of the HHC. Subduction of the Eurasian plate towards S/SW below the Indian plate more extensively in the Garhwal sector could be the second possible reason. Presence of two ductile extensional shear sub-zones may indicate channel flow (or several exhumation mechanisms) of the HHC in a shifting mode (similar to Mukherjee et al. in Int J Earth Sci 101:253-272, 2012). The top-to-S/SW extensional brittle shear exclusively within the upper (northern portion) of the HHC and a top-to-S/SW brittle shear within the remainder of it is a possible indicator of critical taper deformation mechanism. Thus, this work provides the field evidences of possibly both channel flow and critical taper conditions from a Higher Himalayan section, besides that by Larson et al. (Geol Soc Am Bull 122:1116-1134, 2010). © 2013 Springer-Verlag Berlin Heidelberg. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84884419089&doi=10.1007%2fs00531-012-0861-5&partnerID=40&md5=2c43a894858903456deee18e11ae073b
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/70512
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Department of Earth Sciences, Indian Institute of Technology Bombay, Powai, Mumbai, 400076 Maharashtra, India
Recommended Citation:
Mukherjee S.. Higher Himalaya in the Bhagirathi section (NW Himalaya, India): Its structures, backthrusts and extrusion mechanism by both channel flow and critical taper mechanisms[J]. International Journal of Earth Sciences,2013-01-01,102(7)