Sedimentation and Deformation of the Yanghu Basin and Its Tectonic Implications in the Western Hoh Xil, Central Tibet
详细信息
- 责任者：Li Yalin (Institute of the Qinghai-Tibet Plateau Geology ; China University of Geosciences ; Beijing 100083 ; China) ; Zhu Lidong
- 刊名：Acta Petrologica Sinica
- 出版年：2013
- 卷期：29(3)
- 关键词：沉积作用 ; sedimentation ; 构造变形 ; tectonic deformation ; 可可西里山 ; Kekexili Mountains
- 页码：p.1017-1026
- 图表：illus., 36 refs.
- 分类号：0803
- issnNo：ISSN1000-0569
- isbnNo：CN11-1922/P
摘要
The scale and structure attribute of the Hoh Xil basin are the keys to understand the Cenozoic evolution and uplift of the Tibetan Plateau.However,the sedimentation and deformation are poorly known about the western Hoh Xil that makes the present interpretations highly debatable.Here we report the results of sedimentary facies,detrital zircon U-Pb isotopic compositions and deformation of the Yanghu bain in the western Hoh Xil.There are two depositional sequences developed in the basin,including the lower alluvial fan and upper lacustrine facies,with a total thickness of exceeding 1302m.The lithofacies and facies association are similar with the Oligocene Yaxicuo Formation and Miocene Wudaoliang Group in the eastern Hoh Xil basin.Paleocurrent directions and detrital zircon indicate that the basin provenance was coming from the Qiangtang blocks,which is also in accordance with eastern Hoh Xil basin.Moreover,two tectonic units are identified in this area,they are the southern thrust belt and Yanghu bain from south to north,which have caused 51% and 41% crustal shortening during Early Tertiary respectively.These observations,in combination with sequential filling patterns,sedimentary facies and deformation all indicate that the Yanghu basin has undergone similar evolution with the eastern Hoh Xil basin,imply that there was a single,wide basin in the Central Tibetan Plateau during Paleogene-Miocene.
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