气候变化领域集成服务门户(CCPortal): Crustal structure beneath the northern part of the southeastern Tibetan Plateau revealed by a seismic dense nodal array

CCPortal

DOI	10.1016/j.jseaes.2023.105593
	Crustal structure beneath the northern part of the southeastern Tibetan Plateau revealed by a seismic dense nodal array
	Tan, Shunjia; Tian, Xiaobo; Zeng, Xiangzhi; Nie, Fengjun; Qu, Chen; Yu, Changqing
发表日期	2023
ISSN	1367-9120
EISSN	1878-5786
卷号	258
英文摘要	The continental convergence between the Indian and Eurasian plates in the Cenozoic not only caused the formation of the Tibetan Plateau (TP) but also pushed a large volume of continental lithosphere out of the plateau southeastwards. It has been strongly debated for many years how to transport mass from the central plateau to the southeastern TP. In the area between the central plateau and its southeastern margin, we deployed a southwest-northeast-trending dense seismic nodal array to record teleseismic waveforms. Receiver function methods were used to estimate the crustal bulk properties and to image the crustal structure. Our results show that the crustal thickness is approximately 60 km and the crustal average Vp/Vs ratio is approximately 1.78, which is less than the predicted values of the crustal channel flow model. In the crustal structure image, the Moho beneath the southwestern part of the profile dips northeast and extends below the Moho beneath the northeastern part of the profile. Beneath the southwestern part of the profile, a lower crustal northeast-dipping interface is also imaged, which is likely linked with the Jinsha River suture. Our results suggest that the most significant crustal thickening in the southeastern TP was produced by the northwards or northeastwards subduction of the Qiangtang block, which occurred in the late Oligocene to early Miocene, as indicated by palaeoaltimetric studies. This finding implies that the modern landform in the southeastern TP resulted from southeastwards block extrusion along strike-slip faults and more monsoonal precipitation and seasonal climate variation since 10 Ma.
关键词	Southeastern Tibetan Plateau Crustal structure image Dense nodal array Jinsha River Suture Yidun block
英文关键词	EXPERIMENTAL DEFORMATION; TECTONIC EVOLUTION; EASTERN TIBET; ANISOTROPIC TOMOGRAPHY; SOUTHERN TIBET; SE TIBET; FLOW; HIMALAYAN; RIVER; CONSTRAINTS
WOS研究方向	Geosciences, Multidisciplinary
WOS记录号	WOS:001121627700001
来源期刊	JOURNAL OF ASIAN EARTH SCIENCES
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283815
作者单位	East China University of Technology; East China University of Technology; China Geological Survey; Chinese Academy of Geological Sciences; Institute of Geology, Chinese Academy of Geological Sciences; Chinese Academy of Sciences; Institute of Geology & Geophysics, CAS; Chinese Academy of Sciences
推荐引用方式 GB/T 7714	Tan, Shunjia,Tian, Xiaobo,Zeng, Xiangzhi,et al. Crustal structure beneath the northern part of the southeastern Tibetan Plateau revealed by a seismic dense nodal array[J],2023,258.
APA	Tan, Shunjia,Tian, Xiaobo,Zeng, Xiangzhi,Nie, Fengjun,Qu, Chen,&Yu, Changqing.(2023).Crustal structure beneath the northern part of the southeastern Tibetan Plateau revealed by a seismic dense nodal array.JOURNAL OF ASIAN EARTH SCIENCES,258.
MLA	Tan, Shunjia,et al."Crustal structure beneath the northern part of the southeastern Tibetan Plateau revealed by a seismic dense nodal array".JOURNAL OF ASIAN EARTH SCIENCES 258(2023).