Mesozoic–Paleogene sedimentary facies and paleogeography of Tibet, western China: tectonic implications
Mesozoic–Paleogene sedimentary facies and paleogeography of Tibet, western China: tectonic implications
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DOI：
10.1002/gj.911
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发表时间：
2002-07
影响因子：
1.8
通讯作者：
Kai‐Jun Zhang;B. Xia;Xiwen Liang
中科院分区：
文献类型：
--
作者：
Kai‐Jun Zhang;B. Xia;Xiwen Liang
早白垩世早期，羌塘大部分地区已变为旱地，整个拉萨地区以上海环境为主。早白垩世晚期，羌塘西部南部和拉萨北部以台地-陆架碳酸盐岩为主。晚白垩世羌塘大部分地区已成为陆生地，拉萨、羌塘西部边缘和塔里木地区主要为潮上环境。
In Early–Middle Triassic time, an abyssal sea covered most of the Songpan–Ganzi area, whereas a Central Tibetan Landmass, up to 400 km wide, may have stretched across the Lhasa and Western Qiangtang terrains. In Late Triassic time, the Songpan–Ganzi sea closed, the Central Tibetan Landmass receded westwards away from southern Western Qiangtang, a littoral environment dominated Eastern Qiangtang, middle Western Qiangtang, and southeastern Lhasa, a shelf environment existed only in northern and southeastern Western Qiangtang and northwestern Eastern Qiangtang, and abyssal flysch was spread along the eastern Bangonghu–Nüjiang zone. In Early–Middle Jurassic time, Songpan–Ganzi had become part of the Eurasian continent, abyssal flysch sediments stretched throughout the Bangonghu–Nüjiang zone, the Central Tibetan Landmass was only locally present in southwestern Lhasa, and the Tethyan epicontinental sea nearly covered all Tibet southwest of the Jinsajiang suture. In Late Jurassic time, oceanic flysch deposition existed only along the westernmost Bangonghu–Nüjiang zone, nearly all of Tibet was covered by coastal deposits, and shelf deposits existed only in northern Western Qiangtang and westernmost Lhasa. In the early stage of Early Cretaceous time, the majority of Qiangtang had become dry land, and a supralittoral environment dominated across the entire Lhasa terrain. However, during the late stage of the Early Cretaceous time, platform–shelf carbonates prevailed on southern Western Qiangtang and northern Lhasa. In Late Cretaceous time, the majority of Qiangtang had become emergent land, and a supratidal environment dominated Lhasa, the western rim of Western Qiangtang, and Tarim. In Paleogene time, the majority of Tibet became emergent land, and a supratidal environment existed only on the southern and western rims.