Provenance change of sediment input in the northeastern foreland of Pamir related to collision of the Indian Plate with the Kohistan‐Ladakh arc at around 47 Ma
Provenance change of sediment input in the northeastern foreland of Pamir related to collision of the Indian Plate with the Kohistan‐Ladakh arc at around 47 Ma
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DOI：
10.1002/2015tc003974
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发表时间：
2016-02
期刊：
影响因子：
4.2
通讯作者：
Jimin Sun;W. Xiao;B. Windley;Weiqiang Ji;B. Fu;Jian‐Gang Wang;Chunsheng Jin
中科院分区：
文献类型：
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作者：
Jimin Sun;W. Xiao;B. Windley;Weiqiang Ji;B. Fu;Jian‐Gang Wang;Chunsheng Jin
帕米尔高原形成了一个突出的构造凸起，标志着喜马拉雅造山带的西端，该造山带包含几个从晚古生代到新生代增生到欧亚大陆的碎屑岩。详细了解帕米尔凸起新生代构造演化过程，对认识西喜马拉雅陆内变形具有重要意义。虽然帕米尔凸起的构造演化已经被研究了很久，但印度板块和科希斯坦-拉达克弧之间的碰撞时间仍然是一个有争议的问题。我们提出了新的U-Pb年龄和Hf同位素的碎屑锆石，磁组构，稳定同位素从帕米尔东北缘的前陆盆地，表明在沉积物源区的变化开始于约47 Ma。塔里木盆地西南部的沉积物部分来源于大约47 Ma时印度板块与科希斯坦-拉达克弧碰撞产生的抬升和侵蚀的喀喇昆仑山脉和科希斯坦山脉，这是印度板块在欧亚大陆下向北逆冲和扩张的结果。
The Pamir plateau forms a prominent tectonic salient that marks the western end of the Himalayan orogen containing several terranes that were accreted to Eurasia from the Late Paleozoic to Cenozoic. A detailed knowledge of the tectonic evolution of the Pamir salient during the Cenozoic is important for our understanding of the intracontinental deformation in the western Himalaya. Although the tectonic evolution of the Pamir salient has long been studied, the timing of collision between the Indian Plate and the Kohistan‐Ladakh arc is still a matter of debate. We present new U‐Pb ages and Hf isotopes of detrital zircons, magnetic fabrics, and stable isotopes from the foreland basin on the northeastern margin of the Pamir that indicate a change in sediment provenance started at about 47 Ma. Sediments in the southwest Tarim Basin were partially derived from the uplifted and eroded Karakoram and Kohistan terranes created by the collision between the Indian Plate and the Kohistan‐Ladakh arc at circa 47 Ma, as a result of northward thrusting and propagation of the Indian Plate under Eurasia.