The embryonic Himalayan foreland basin revealed in the eastern Yarlung Zangbo suture zone, southeastern Tibet
The embryonic Himalayan foreland basin revealed in the eastern Yarlung Zangbo suture zone, southeastern Tibet
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西藏东南部雅鲁藏布江缝合带东部揭示喜马拉雅前陆盆地雏形
DOI：
10.1016/j.sedgeo.2020.105743
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发表时间：
2020-08
影响因子：
2.8
通讯作者：
Gongjue Jiebu
中科院分区：
文献类型：
--
作者：
Wei Zhen;Li Xianghui;Hugh Sinclair;Fan Xiaolong;Wang Jingyu;Zhang Chaokai;Gongjue Jiebu
对早期前陆盆地发育的认识是重建早期碰撞过程的时间和性质的关键。早期喜玛拉雅前陆盆地体系的性质在中部地区得到了很好的确立。喜马拉雅山脉，在雅鲁藏布江东部缝合带缺乏分析。在本文中，我们研究。研究区域岩性和构造演化，分析碎屑锆石的地球化学和年代学。结果表明：1)先前命名的白垩纪。郎县msamulange由两个独立的地层单元组成——新修订的早始新世（~56 Ma）地层单元。琅县单元和三叠系琅界雪群；2)郎县单元逆冲渐新世至中新世。大竹卡组上覆和/或下覆有高度变形的琅界雪群；3) Shalenormalized。轻REE亏缺、La富集、正Y异常+大理岩的REE + Y模式Sr同位素比值为0.707481 ~ 0.707897，表明琅县单元最初沉积于海相环境；(4) 20个岩石样品的1270个一致的碎屑锆石表明其物源为双源区——北部为冈底斯弧和（或）弧前再循环地层，南部为琅界雪群。沉积于东喜马拉雅造山运动初期的远前深盆地。最简单的解释。它反映了一个未填满的海相盆地，其来源来自早期山脉的北部和。南部的前隆起侵蚀区。
Understanding of early foreland basin development is key to reconstruct the timing and nature of early collisional.processes. Though the nature of the early Himalayan foreland basin system is well established in the central.Himalaya range, it lacks analysis in the eastern Yarlung Zangbo suture zone. In this article, we investigate the.region's lithological and structural evolution and analyze the geochemistry and geochronology of detrital zircons.and bulk rocks in the Jiacha-Jindong region, southeastern Tibet. We show that: 1) The previously named Cretaceous.Langxian Mélange comprises two separate stratigraphic units—the newly revised early Eocene (~56 Ma).Langxian unit and the Triassic Langjiexue Group; 2) The Langxian unit overthrusts the Oligocene to Miocene.Dazhuka Formation and is overlain and/or underlain by the highly-deformed Langjiexue Group; 3) Shalenormalized.REE + Y patterns of marbles with light REE depletion, La enrichment, and positive Y anomaly plus.Sr isotope ratios 0.707481–0.707897, together demonstrate the Langxian unit was originally deposited in a marine.environment; 4) ~1270 concordant detrital zircons from 20 rock samples indicate a bilateral provenance—.from both the Gangdese arc and/or recycled forearc strata in the north and the Langjiexue Group in the south..The evidence illustrates that the Langxian unit records the early India-Asia collision and its protoliths could.have been deposited in a distal foredeep basin to the embryonic eastern Himalaya orogeny. The simplest explanation.is that it reflects an underfilled marine basinwith sources fromthe early mountain range to the north and.a region of forebulge erosion to the south.
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影响因子：
2.7
作者：
H. Sinclair;N. Jaffey
通讯作者：
H. Sinclair;N. Jaffey
DOI：
--
发表时间：
2000
期刊：
Journal of stratigraphy
影响因子：
--
作者：
Li Xiang
通讯作者：
Li Xiang
影响因子：
5.3
作者：
Wentao Huang;D. Hinsbergen;M. Maffione;D. Orme;G. Dupont‐Nivet;C. Guilmette;L. Ding;Zhaojie Guo;P. Kapp
通讯作者：
Wentao Huang;D. Hinsbergen;M. Maffione;D. Orme;G. Dupont‐Nivet;C. Guilmette;L. Ding;Zhaojie Guo;P. Kapp
影响因子：
3.5
作者：
Chao Wang;L. Ding;Liyun Zhang;P. Kapp;A. Pullen;Yahui Yue
通讯作者：
Chao Wang;L. Ding;Liyun Zhang;P. Kapp;A. Pullen;Yahui Yue
影响因子：
2.1
作者：
Li Xiang
通讯作者：
Li Xiang