Strain Accommodation in the Daliangshan Mountain Area, Southeastern Margin of the Tibetan Plateau

被引:30
作者
Rui, X. [1 ]
Stamps, D. S. [2 ]
机构
[1] Sichuan Earthquake Agcy, Res Inst Disaster Reduct & Emergency Rescue, Chengdu, Sichuan, Peoples R China
[2] Virginia Tech, Dept Geosci, Geodesy & Tectonophys Lab, Blacksburg, VA USA
关键词
the southeastern Tibetan Plateau; block kinematics; GNSS; Euler pole clustering; deformation mechanism; FAULT ZONE; CRUSTAL DEFORMATION; STATISTICAL TESTS; ACTIVE TECTONICS; EASTERN BOUNDARY; WESTERN SICHUAN; GPS VELOCITIES; ZEMUHE FAULT; YUNNAN; MOTION;
D O I
10.1029/2019JB017614
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
The Xianshuihe-Xiaojiang fault system (XXFS) plays a crucial role in accommodating relative motions of the south China block and the expanding Tibetan Plateau. Compared to the narrow southern and northern segments of the XXFS, the central section (also referred to as the Daliangshan mountain area) is broader and dissected by a network of faults. Geologic studies suggest that three major NNW trending faults may dominate slip partitioning of more recent faults in this region. However, due to accessibility issues, sparse geodetic studies have constrained geodetic fault slip rates with contradictory results. In this study, we use 17 new Global Navigation Satellite System sites combined with existing solutions to investigate slip partitioning of the region. We derive a tectonic velocity solution, develop a block kinematic model constrained by Euler pole clustering technique, and calculate geodetic fault slip rates to compare with geologic fault slip rates. We confirm that the Anninghe-Daliangshan sliver (ADS) is a distinct, rigid block, and we resolve a new, rigid Daliangshan-Yingjing-Mabian block (DYB). Kinematic modeling predicts long-term slip rates that suggest both the ADS and the DYB partition (similar to 10.0-12.0 mm/year) relative motion between the Tibetan Plateau and south China block in the central XXFS, reconciling geologic observations. We suggest that both the continuum and microplate deformation patterns are present in our study area, of which the local tectonics is better explained by the microplate model, but scale of the kinematics makes its motion more consistent with the continuum model.
引用
收藏
页码:9816 / 9832
页数:17
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