The tectonics of the western Ordos Plateau, Ningxia, China: Slip rates on the Luoshan and East Helanshan Faults
File(s)western_ordos_tectonics_paper_12_small_compressed.pdf (7.59 MB)
Accepted version
Author(s)
Type
Journal Article
Abstract
Analysis of the locus, style, and rate of faulting is fundamental to understanding thekinematics of continental deformation. The Ordos Plateau lies to the northeast of Tibet, within theIndia-Eurasia collision zone. Previous studies have suggested that it behaves rigidly and rotatesanticlockwise within a large-scale zone of ENE-WSW left-lateral shearing. For this rotation to beaccommodated, the eastern and western margins of the Ordos Plateau should be undergoing right-lateralshearing and yet the dominant faulting style appears to be extensional. We focus specifically on thekinematics of the faults bounding the western margin of the Ordos Plateau and make new slip rateestimates for two of the major faults in the region: the right-lateral strike-slip Luoshan Fault and thenormal-slip East Helanshan Fault. We use a combination of infrared stimulated luminescence dating ofoffset landforms with high-resolution imagery and topography from the Pleiades satellites to determinean average right-lateral slip rate of 4.3 ± 0.4 mm/a (1 uncertainty) on the Luoshan Fault. Similarly,we use10Be exposure dating to determine a vertical throw rate on the East Helanshan Fault of<0.6 ± 0.1 mm/a, corresponding to an extension rate of <0.7 ± 0.1 mm/a (1 uncertainty). Both ofthese results agree well with slip rates determined from the latest campaign GPS data. We thereforeconclude that right-lateral shearing is the dominant motion occurring in the western Ordos region,supporting a kinematic model of large-scale anticlockwise rotation of the whole Ordos Plateau.
Date Issued
2016-11-29
Date Acceptance
2016-10-27
Citation
Tectonics, 2016, 35 (11), pp.2754-2777
ISSN
0278-7407
Publisher
American Geophysical Union
Start Page
2754
End Page
2777
Journal / Book Title
Tectonics
Volume
35
Issue
11
Copyright Statement
© 2016 American Geophysical Union. All Rights Reserved. Accepted for publication in Tectonics. Further reproduction or electronic distribution is not permitted.
Identifier
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000392832100011&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
Subjects
Science & Technology
Physical Sciences
Geochemistry & Geophysics
Ordos Plateau
China
kinematics
Luoshan Fault
right-lateral strike slip
anticlockwise rotation
HUI AUTONOMOUS REGION
SHANXI RIFT SYSTEM
ALTYN TAGH FAULT
STRIKE-SLIP
NORTHEASTERN MARGIN
TIBETAN PLATEAU
HAIYUAN FAULT
NORTH CHINA
EXTRUSION TECTONICS
SOUTHERN CALIFORNIA
0403 Geology
0404 Geophysics
Publication Status
Published