Lateral extrusion along the Altyn Tagh Fault, Qilian Shan (NE Tibet): insight from a 3D crustal budget
Lateral extrusion along the Altyn Tagh Fault, Qilian Shan (NE Tibet): insight from a 3D crustal budget
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DOI：
10.1111/ter.12173
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发表时间：
2015-12
期刊：
影响因子：
2.4
通讯作者：
F. Cheng;M. Jolivet;G. Dupont‐Nivet;Lin Wang;Xiangjiang Yu;Zhaojie Guo
中科院分区：
文献类型：
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作者：
F. Cheng;M. Jolivet;G. Dupont‐Nivet;Lin Wang;Xiangjiang Yu;Zhaojie Guo
自始新世重新活动以来，岩石圈走滑的阿尔金·塔格断裂在柴达木和塔里木地块之间容纳了数百公里的位移。然而，这种变形在祁连山及其以东的适应方式仍不确定。根据相对刚性的柴达木地块沿阿尔金断裂向东北方向迁移360公里和阿尔金断裂-祁连山系内部地壳形变的三维等容平衡，我们认为，250±28公里(43.8-49.4%)的N20E向地壳定向缩短和额外的~250-370公里的祁连山地壳东移必须由祁连山的走滑断裂和秦岭地区的地壳增厚以及毗邻的北中国地块系的伸展作用所解释。
The lithospheric strike‐slip Altyn Tagh Fault has accommodated hundreds of kilometres of displacement between the Qaidam and Tarim blocks since its Eocene reactivation. However, the way the deformation is accommodated in the Qilian Shan and further east remains uncertain. Based on 360 km of north‐eastward migration of the relatively rigid Qaidam block along the Altyn Tagh Fault and 3D isovolumetric balancing of the crustal deformation within the Altyn Tagh Fault–Qilian Shan system, we demonstrate that 250 ± 28 km (43.8–49.4%) of N20E directed crustal shortening and an additional ~250–370 km of eastward motion of the Qilian Shan crust must be accounted for by strike‐slip faulting in the Qilian Shan and crustal thickening in the Qinling area, as well as by extension in the adjoining North China block graben systems.