Thermal history and exhumation processes in the Chinese South Tianshan: constraints from 40Ar/39Ar and (U-Th)/He ages
Thermal history and exhumation processes in the Chinese South Tianshan: constraints from 40Ar/39Ar and (U-Th)/He ages
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中国南天山的热历史和折返过程：40Ar/39Ar和(U-Th)/He年龄的限制
DOI：
10.1007/s00531-021-02031-x
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发表时间：
2021-04
影响因子：
2.3
通讯作者：
Yan Zhang
中科院分区：
文献类型：
--
作者：
Wen Zhang;Wen Chen;Jingbo Sun;Ze Shen;Yan Zhang
位于中亚造山带西南缘的中国南天山是阐明整个中亚造山带盛行碰撞造山作用与隆升机制之间联系的重要构造部位。为了约束CSTS的折返过程，我们测定了CSTS的哈尔克山、额尔滨山和塔里木盆地巴楚隆起的锆石U-Pb、黑云母和钾长石40Ar/39Ar和磷灰石(U-Th)/He的系统年龄(作为对比研究)。结果揭示了CSTS热历史和折返过程的时空差异，可分为三个阶段。第一阶段(P1)：侵入体侵位后经历了岩浆冷却作用，揭示了岩体在哈尔克山的侵位位置比二滨山和巴楚隆起更深。第二阶段(P2-K)：由于南部的羌塘-昆仑碰撞和羌塘-拉萨碰撞，喀尔克山经历了快速冷却和折返过程(3.0°C/Ma，0.14 mm/年)，而额尔滨山(2.0°C/Ma，0.09 mm/年)和巴楚隆起(1.8°C/Ma，0.07 mm/年)则经历了快速冷却和折返过程。第三阶段(Cz)：CSTS新生代快速折返向东减弱，最晚和最快的隆升发生在西侧的哈尔克山(8.6 Ma，5.5°C/Ma)、东部的欧西大班岩体(31.1 Ma)和额尔滨山(56.4 Ma，0.8°C/Ma)之后，可能与印度-欧亚碰撞的远期影响有关。此外，巴楚北部的隆起可能足够坚硬，可以在新生代期间将欧亚大陆南部的驱动力从南向北传递。
The Chinese South Tianshan (CSTS) on the southwestern margin of the Central Asian Orogenic Belt (CAOB) is a vital tectonic location to elucidate the links between the prevailing Cimmerian collisional orogenic process and uplift mechanisms in the whole CAOB. To constrain the CSTS exhumation processes, we determined systematic zircon U–Pb, biotite and K-feldspar 40Ar/39Ar and apatite (U-Th)/He ages of plutons from Hark and Erbin Mountains in the CSTS and the Bachu Uplift in the Tarim Basin (for comparative study). The results reveal spatial and temporal disparities in the CSTS thermal history and exhumation processes, which can be classified into three stages. Stage I (P1): intrusive bodies experienced magmatic cooling episodes after emplacement, revealing a deeper emplacement location for the pluton in Hark Mountain than in Erbin Mountain and the Bachu Uplift. Stage II (P2-K): Hark Mountain experienced rapid cooling and exhumation processes (3.0 °C/Ma, 0.14 mm/year) compared with the Erbin Mountain (2.0 °C/Ma, 0.09 mm/year) and Bachu Uplift (1.8 °C/Ma, 0.07 mm/year), resulted from the Qiangtang-Kunlun collision and Qiangtang-Lhasa collision in the south. Stage III (Cz): Rapid Cenozoic exhumation in the CSTS weakened eastward; the latest and most rapid uplift occurred in Hark Mountain to the west (8.6 Ma, 5.5 °C/Ma), after the eastern Ouxidaban pluton (31.1 Ma) and Erbin Mountain (56.4 Ma, 0.8 °C/Ma), possibly related to the remote effects of the India-Eurasia collision. Further, the northern Bachu Uplift could have been rigid enough that could transmit the driving forces in southern Eurasia from south to north during the Cenozoic.
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