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首页> 外文期刊>Tectonics >The Cenozoic Evolution of Crustal Shortening and Left-Lateral Shear in the Central East Kunlun Shan: Implications for the Uplift History of the Tibetan Plateau
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The Cenozoic Evolution of Crustal Shortening and Left-Lateral Shear in the Central East Kunlun Shan: Implications for the Uplift History of the Tibetan Plateau

机译：中东昆仑山地壳缩短和左侧剪切的新生代演变：藏高原隆起历史的影响

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The timing of crustal shortening and strike-slip faulting along the East Kunlun Shan provides insight into the history of surface uplift and may constrain the time at which the Tibetan Plateau reached high elevations. We investigate a series of extensional basins and restraining bends along the Xidatan strand of the Kunlun strike-slip fault, which provide an ideal setting to unravel the tectonic history of the northern plateau margin. We present new apatite (U-Th)/He, apatite fission track, and zircon (U-Th)/He ages and QTQt thermal modeling, Ar-40/Ar-39 fault gouge dating, and structural mapping from the central East Kunlun Shan. Our data suggest that the East Kunlun Shan experienced slow to negligible exhumation until late Cretaceous time, followed by an increase in rate by 65-50 Ma. Along with a similar to 47 Ma fault gouge age, we posit that the Paleocene-early Eocene was a time of crustal shortening along the northern plateau. Rapid exhumation along transpressional portions of the Xidatan fault initiated by 23-20 Ma, which we interpret as the local onset of strike-slip faulting. An early Miocene transition from north-south crustal shortening to left-lateral shear along the East Kunlun Shan, the onset of normal and strike-slip faulting in central and southern Tibet by 18 Ma, and lower crustal flow in eastern Tibet by 13 Ma suggest the establishment of orogen-wide east-west oriented extension and extrusion by the middle Miocene. The plateau-wide shift in stress accommodation implies that high gravitational potential energy, and likely high elevation, was attained by the middle Miocene.
机译：沿着东昆仑山的地壳缩短和防滑断裂的时间介绍了对表面隆起历史的洞察力，可以限制藏高平台达到高升高的时间。我们调查一系列延伸盆地，沿着昆仑防滑故障的西凡丹股线抑制弯曲，提供了一个理想的环境，以解开北高原裕度的构造历史。我们呈现新的磷灰石（U-TH）/ HE，磷灰石裂变轨道和ZIRCON（U-TH）/ HE和QTQT热建模，AR-40 / AR-39故障罩约会，以及来自中央东昆仑的结构映射山。我们的数据表明，东昆仑山的呼吸速度速度速度缓慢，直到白垩纪的时间，随后将增加65-50 mA。随着类似于47 mA的故障凹槽年龄，我们认为古代 - 早期的eocene是沿着北高原地壳缩短的时代。沿着Xidatan故障的破碎部分快速挖掘，由23-20 mA发起，我们将其解释为击落局的局部发作。从南北地壳的早期后期过渡到沿着东昆仑山的左侧剪切，在中部和南部的南部的正常和防滑断裂发作18 mA，东藏的地壳流量下调13 mA表示建立了中间内外奥林斯宽的东西面向延伸和挤出。压力容纳的高原偏移意味着中间部内突中的高重力势能和可能高升高。

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