A Regionally Evolving Transpressional Duplex Along the Northern Margin of the Altyn Tagh Fault: New Kinematic and Timing Constraints From the Sanweishan and Nanjieshan, China
A Regionally Evolving Transpressional Duplex Along the Northern Margin of the Altyn Tagh Fault: New Kinematic and Timing Constraints From the Sanweishan and Nanjieshan, China
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DOI：
10.1029/2019tc005749
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发表时间：
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影响因子：
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通讯作者：
Ling Zhang（张玲）
中科院分区：
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作者：
Haibo Yang（杨海波）;Xiaoping Yang（杨晓平）;Dickson Cunningham;Zongkai Hu（胡宗凯）;Xiongnan Huang（黄雄南）;Weiliang Huang（黄伟亮）;Huili Yang（杨会丽）;Shuqing Miao（苗树青）;Ling Zhang（张玲）
In this study, we document the kinematics and Late Quaternary slip rates of actively.developing faults and folds on the northern side of the Altyn Tagh Fault (ATF) that accommodate uplift.and lateral expansion of the northern Tibetan Plateau. Field observations and detailed measurements using.Unmanned‐Aerial‐Vehicle Structure‐from‐Motion high‐resolution imagery of offset fan surfaces, gullies,.and channel risers coupled with optically stimulated luminescence and 10Be ages constrain the timing and.slip rates of the Sanweishan Fault (SWSF) and Nanjieshan Fault (NJSF) systems. The NE striking SWSF is.characterized by sinistral strike slip with a top‐to‐the‐NW thrusting component. Offset geomorphic markers.and dating results yield Pleistocene strike slip and vertical uplift rates of 0.06–1.25 mm/a and 0.05–0.08.mm/a, respectively. The E‐W trending NJSF is dominated by north and south directed thrusting and kmscale.folding with variable components of sinistral strike slip. The calculated total N‐S shortening rate across.the NJSF is ~0.3 mm/a. Low rates of deformation for the SWSF and NJSF account for less than 10% of the.total intraplate strain accommodated along the northeasternmost ATF system. Over a 1,000‐km length, the.northward expansion of the Tibetan Plateau occurs by progressive northeastward growth of a.transpressional duplex rooted SE into the ATF. An assumed crustal strength discontinuity along the.northeast trending southern margin of the Tarim Craton focuses oblique convergence along the ATF..Oblique‐slip thrusting and sinistral strike slip along the ATF and to the north accommodate the oblique.convergence, consistent with the ENE directed geodetically derived crustal velocity field driven by India's.continued indentation 1,500 km to the south.
