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Deformation and cooling history of the Central Qiangtang terrane, Tibetan Plateau and its tectonic implications
International Geology Review ( IF 2.6 ) Pub Date : 2020-07-28 , DOI: 10.1080/00206814.2020.1795733
Wenjun Bi 1, 2 , Zhongpeng Han 1, 2 , Yalin Li 1, 2 , Chengming Li 2 , Chengshan Wang 1, 2 , Jiawei Zhang 2 , Jianyun Han 2 , Haiyang He 2, 3 , Xinyu Qian 2 , Tiankun Xu 2 , Zining Ma 2
Affiliation  

ABSTRACT

The Qiangtang terrane preserves an important record of the growth of the Tibetan Plateau since the Mesozoic; however, its deformation and cooling history remain poorly understood. To unravel this issue, we conducted geological mapping in the Esima area and detrital apatite fission track and (U–Th)/He analyses of the Esima–Rongtang region in the east segment of Central Qiangtang terrane. Our results indicate that the east segment underwent two stages of structural deformation and rapid cooling during 120–110 Ma and 55–38 Ma. By combining our results with those of previous studies of the deformation and cooling history in the west segment, we reconstructed the early spatial and temporal geological evolution of the Central Qiangtang terrane since the Late Jurassic–Early Cretaceous. The structural deformation and cooling of the west segment at 150–130 Ma was related to northward flat subduction of the Bangong–Nujiang oceanic slab. The structural deformation and cooling of the east segment at 120–110 Ma and the west segment at 110–70 Ma was controlled by oblique convergence between Lhasa and Qiangtang terranes. The structural deformation and cooling of the west and east segments at 55–38 Ma was associated with northward intracontinental subduction beneath the Qiangtang terrane induced by the Indo–Asian collision.



中文翻译:

青藏高原中部羌塘地体变形冷却史及其构造意义

摘要

羌塘地体保存了中生代以来青藏高原生长的重要记录;然而,它的变形和冷却历史仍然知之甚少。为了解决这个问题,我们对鄂斯玛地区进行了地质填图和碎屑磷灰石裂变径迹,并对羌塘地体中段东段的鄂斯玛-容塘地区进行了(U-Th)/He分析。我们的研究结果表明,东段在 120-110 Ma 和 55-38 Ma 期间经历了结构变形和快速冷却两个阶段。结合前人对西段变形冷却史的研究,重建了晚侏罗世—早白垩世以来羌塘地体早期时空地质演化过程。西段150-130 Ma的构造变形和冷却与班公-怒江大洋板块向北平俯俯冲有关。东段120~110 Ma和西段110~70 Ma的构造变形和冷却受拉萨地体和羌塘地体的斜辐合控制。西段和东段在 55-38 Ma 的构造变形和冷却与印亚碰撞引起的羌塘地体下向北的陆内俯冲有关。

更新日期:2020-07-28
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