Young, active conjugate strike-slip deformation in West Sichuan: Evidence for the stress-strain pattern of the southeastern Tibetan Plateau

Zhe Su, Erchie Wang, Kevin Patrick Furlong, Xuhua Shi, Gang Wang, Chun Fan

Research output: Contribution to journalReview article

6 Citations (Scopus)

Abstract

The active kinematics of the eastern Tibetan Plateau are characterized by the southeastward movement of a major tectonic unit, the Chuan-Dian crustal fragment, bounded by the left-lateral Xianshuihe-Xiaojiang fault in the northeast and the right-lateral Red River-Ailao Shan shear zone in the southwest. Our field structural and geomorphic observations define two sets of young, active strike-slip faults within the northern part of the fragment that lie within the SE Tibetan Plateau. One set trends NE-SW with right-lateral displacement and includes the Jiulong, Batang, and Derong faults. The second set trends NW-SE with left-lateral displacement and includes the Xianshuihe, Litang, Xiangcheng, Zhongdian, and Xuebo faults. Strike-slip displacements along these faults were established by the deflection and offset of streams and various lithologic units; these offsets yield an average magnitude of right- and left-lateral displacements of 15-35 km. Using 5.7-3.5 Ma as the time of onset of the late-stage evolution of the Xianshuihe fault and the regional stream incision within this part of the plateau as a proxy for the initiation age of conjugate strike-slip faulting, we have determined an average slip rate of 2.6-9.4 mm/year. These two sets of strike-slip faults intersect at an obtuse angle that ranges from 100 to 140 facing east and west; the fault sets define a conjugate strike-slip pattern that expresses internal E-W shortening in the northern part of the Chuan-Dian crustal fragment. These conjugate faults are interpreted to have experienced clockwise and counterclockwise rotations of up to 20. The presence of this conjugate fault system demonstrates that this part of the Tibetan Plateau is undergoing not only southward movement, but also E-W shortening and N-S lengthening due to convergence between the Sichuan Basin and the eastern Himalayan syntaxis.

Original languageEnglish (US)
Pages (from-to)991-1012
Number of pages22
JournalInternational Geology Review
Volume54
Issue number9
DOIs
StatePublished - Jul 1 2012

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plateau
strike-slip fault
young
slip rate
active fault
deflection
shear zone
faulting
kinematics
tectonics
basin
river
trend

All Science Journal Classification (ASJC) codes

  • Geology

Cite this

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title = "Young, active conjugate strike-slip deformation in West Sichuan: Evidence for the stress-strain pattern of the southeastern Tibetan Plateau",
abstract = "The active kinematics of the eastern Tibetan Plateau are characterized by the southeastward movement of a major tectonic unit, the Chuan-Dian crustal fragment, bounded by the left-lateral Xianshuihe-Xiaojiang fault in the northeast and the right-lateral Red River-Ailao Shan shear zone in the southwest. Our field structural and geomorphic observations define two sets of young, active strike-slip faults within the northern part of the fragment that lie within the SE Tibetan Plateau. One set trends NE-SW with right-lateral displacement and includes the Jiulong, Batang, and Derong faults. The second set trends NW-SE with left-lateral displacement and includes the Xianshuihe, Litang, Xiangcheng, Zhongdian, and Xuebo faults. Strike-slip displacements along these faults were established by the deflection and offset of streams and various lithologic units; these offsets yield an average magnitude of right- and left-lateral displacements of 15-35 km. Using 5.7-3.5 Ma as the time of onset of the late-stage evolution of the Xianshuihe fault and the regional stream incision within this part of the plateau as a proxy for the initiation age of conjugate strike-slip faulting, we have determined an average slip rate of 2.6-9.4 mm/year. These two sets of strike-slip faults intersect at an obtuse angle that ranges from 100 to 140 facing east and west; the fault sets define a conjugate strike-slip pattern that expresses internal E-W shortening in the northern part of the Chuan-Dian crustal fragment. These conjugate faults are interpreted to have experienced clockwise and counterclockwise rotations of up to 20. The presence of this conjugate fault system demonstrates that this part of the Tibetan Plateau is undergoing not only southward movement, but also E-W shortening and N-S lengthening due to convergence between the Sichuan Basin and the eastern Himalayan syntaxis.",
author = "Zhe Su and Erchie Wang and Furlong, {Kevin Patrick} and Xuhua Shi and Gang Wang and Chun Fan",
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Young, active conjugate strike-slip deformation in West Sichuan : Evidence for the stress-strain pattern of the southeastern Tibetan Plateau. / Su, Zhe; Wang, Erchie; Furlong, Kevin Patrick; Shi, Xuhua; Wang, Gang; Fan, Chun.

In: International Geology Review, Vol. 54, No. 9, 01.07.2012, p. 991-1012.

Research output: Contribution to journalReview article

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