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Title: Tertiary deformation history of southeastern and southwestern Tibet during the Indo-Asian collision

Abstract

Geologic mapping and geochronological analysis in southwest (Kailas area) and southeast (Zedong area) Tibet reveal two major episodes of Tertiary crustal shortening along the classic Indus-Tsangpo suture in the Yalu River valley. The older event occurred between ca. 30 and 24 Ma during movement along the north-dipping Gangdese thrust. The development of this thrust caused extensive denudation of the Gangdese batholith in its hanging wall and underthrusting of the Xigase forearc strata in its footwall. Examination of timing of major tectonic events in central Asia suggests that the initiation of the Gangdese thrust was approximately coeval with the late Oligocene initiation and development of north-south shortening in the eastern Kunlun Shan of northern Tibet, the Nan Shan at the northeastern end of the Altyn Tagh fault, the western Kunlun Shan at the southwestern end of the Altyn Tagh fault, and finally the Tian Shan (north of the tarim basin). Such regionally synchronous initiation of crustal shortening in and around the plateau may have been related to changes in convergence rate and direction between the Eurasian plate and the Indian and Pacific plates. The younger thrusting event along the Yalu River valley occurred between 19 and 10 Ma along the south-dippingmore » Great Counter thrust system, equivalent to the locally named Renbu-Zedong thrust in southeastern Tibet, the Backthrust system in south-central Tibet, and the South Kailas thrust in southwest Tibet. The coeval development of the Great Counter thrust and the North Himalayan granite-gneiss dome belt is consistent with their development being related to thermal weakening of the north Himalayan and south Tibetan crust, due perhaps to thermal relaxation of an already thickened crust created by the early phase of collision between India and Asia or frictional heating along major thrusts, such as the Main Central thrust, beneath the Himalaya.« less

Authors:
; ; ; ; ; ; ;
Publication Date:
Research Org.:
Univ. of California, Los Angeles, CA (US)
Sponsoring Org.:
National Science Foundation (NSF); USDOE
OSTI Identifier:
20018998
DOE Contract Number:  
FG03-89ER14049; W-7405-ENG-48
Resource Type:
Journal Article
Journal Name:
Geological Society of America, Bulletin
Additional Journal Information:
Journal Volume: 111; Journal Issue: 11; Other Information: PBD: Nov 1999; Journal ID: ISSN 0016-7606
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; TIBET; PLATE TECTONICS; GEOLOGIC HISTORY; GEOLOGIC FAULTS; CONTINENTAL CRUST; HIMALAYAS

Citation Formats

Yin, A., Harrison, T.M., Murphy, M.A., Grove, M., Nie, S., Ryerson, F.J., Feng, W.X., and Le, C.Z. Tertiary deformation history of southeastern and southwestern Tibet during the Indo-Asian collision. United States: N. p., 1999. Web. doi:10.1130/0016-7606(1999)111<1644:TDHOSA>2.3.CO;2.
Yin, A., Harrison, T.M., Murphy, M.A., Grove, M., Nie, S., Ryerson, F.J., Feng, W.X., & Le, C.Z. Tertiary deformation history of southeastern and southwestern Tibet during the Indo-Asian collision. United States. doi:10.1130/0016-7606(1999)111<1644:TDHOSA>2.3.CO;2.
Yin, A., Harrison, T.M., Murphy, M.A., Grove, M., Nie, S., Ryerson, F.J., Feng, W.X., and Le, C.Z. Mon . "Tertiary deformation history of southeastern and southwestern Tibet during the Indo-Asian collision". United States. doi:10.1130/0016-7606(1999)111<1644:TDHOSA>2.3.CO;2.
@article{osti_20018998,
title = {Tertiary deformation history of southeastern and southwestern Tibet during the Indo-Asian collision},
author = {Yin, A. and Harrison, T.M. and Murphy, M.A. and Grove, M. and Nie, S. and Ryerson, F.J. and Feng, W.X. and Le, C.Z.},
abstractNote = {Geologic mapping and geochronological analysis in southwest (Kailas area) and southeast (Zedong area) Tibet reveal two major episodes of Tertiary crustal shortening along the classic Indus-Tsangpo suture in the Yalu River valley. The older event occurred between ca. 30 and 24 Ma during movement along the north-dipping Gangdese thrust. The development of this thrust caused extensive denudation of the Gangdese batholith in its hanging wall and underthrusting of the Xigase forearc strata in its footwall. Examination of timing of major tectonic events in central Asia suggests that the initiation of the Gangdese thrust was approximately coeval with the late Oligocene initiation and development of north-south shortening in the eastern Kunlun Shan of northern Tibet, the Nan Shan at the northeastern end of the Altyn Tagh fault, the western Kunlun Shan at the southwestern end of the Altyn Tagh fault, and finally the Tian Shan (north of the tarim basin). Such regionally synchronous initiation of crustal shortening in and around the plateau may have been related to changes in convergence rate and direction between the Eurasian plate and the Indian and Pacific plates. The younger thrusting event along the Yalu River valley occurred between 19 and 10 Ma along the south-dipping Great Counter thrust system, equivalent to the locally named Renbu-Zedong thrust in southeastern Tibet, the Backthrust system in south-central Tibet, and the South Kailas thrust in southwest Tibet. The coeval development of the Great Counter thrust and the North Himalayan granite-gneiss dome belt is consistent with their development being related to thermal weakening of the north Himalayan and south Tibetan crust, due perhaps to thermal relaxation of an already thickened crust created by the early phase of collision between India and Asia or frictional heating along major thrusts, such as the Main Central thrust, beneath the Himalaya.},
doi = {10.1130/0016-7606(1999)111<1644:TDHOSA>2.3.CO;2},
journal = {Geological Society of America, Bulletin},
issn = {0016-7606},
number = 11,
volume = 111,
place = {United States},
year = {1999},
month = {11}
}