气候变化领域集成服务门户(CCPortal): Crustal structure and geodynamics of the eastern Qilian orogenic belt, NE margin of the Qinghai-Tibet plateau, revealed by teleseismic receiver function

CCPortal

DOI	10.3389/feart.2023.1193167
	Crustal structure and geodynamics of the eastern Qilian orogenic belt, NE margin of the Qinghai-Tibet plateau, revealed by teleseismic receiver function
	Cheng, Yongzhi; Gao, Rui; Chen, Jiuhui; Lu, Zhanwu; Li, Wenhui; Wang, Guangwen; Chen, Hao; Han, Rubing; Niu, Xiao; Wu, Guowei; Chen, Si; Cai, Yuguo
发表日期	2023
EISSN	2296-6463
卷号	11
英文摘要	The eastern segment of the Qilian orogenic belt, comprising the Linxia block and Longzhong block, is at the Qinghai-Tibet Plateau's northeastern margin. The area has experienced multiple tectonic events, including closure of the Qilian Ocean, convergence of the North China block and Qilian terrane, and collision of the Indian and Eurasian plates, forming a complex tectonic framework. To investigate the area's geological evolution and the suture's current location between the blocks, we used 3-year data recorded by 33 portable ChinArray II broadband stations (2013-2016). Using three teleseismic P-wave receiver function methods, H-? stacking and common conversion point stacking (CCP), crustal structure, Poisson's ratio, and Moho morphology were obtained at 33 stations. The results are described as follows: 1) The Maxianshan fault is an important boundary fault that divides the Linxia block and Longzhong block. The Linxia block's layered crustal structure is obvious, and there is a low-velocity anomaly in the middle and lower crust, which may contain saline fluid and has Japanese-type island arc characteristics. 2) The layered structure of the Longzhong block's upper crust is significant, while the middle and lower crust's layered structure is weak with weak low-velocity characteristics and oceanic-island basaltic crust characteristics. The Longzhong block may have originally been formed by Mariana-type island arcs. 3) The Conrad interface and Moho lateral variation in the Ordos block's southwestern margin are weak, showing stable craton characteristics. 4) Our results show that the Maxianshan fault cuts through the Earth's crust and is a continuous west-dipping negative seismic phase in the Common Conversion Point section. The fault zone is the suture line between the Linxia block and Longzhong block. 5) The middle and upper crust of the Liupanshan tectonic belt is thrust upwards on the Ordos block's southwestern margin, providing deep structural evidence of the Cenozoic uplift of the Liupanshan structural belt.
关键词	northeastern Tibetan plateau receiver function crustal thickness average crustal Vp/Vs ratio crustal deformation mechanism suture boundary Maxianshan fault
英文关键词	DETRITAL-ZIRCON GEOCHRONOLOGY; MANTLE ELECTRICAL STRUCTURE; NORTHEASTERN MARGIN; ORDOS BASIN; STRUCTURE BENEATH; HAIYUAN FAULT; DEFORMATION; EVOLUTION; GROWTH; SHAN
WOS研究方向	Geosciences, Multidisciplinary
WOS记录号	WOS:001026930200001
来源期刊	FRONTIERS IN EARTH SCIENCE
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283349
作者单位	China Geological Survey; Chinese Academy of Geological Sciences; Institute of Geology, Chinese Academy of Geological Sciences; Sun Yat Sen University; China Earthquake Administration; East China University of Technology; Tsinghua University; China Geological Survey; Chinese Academy of Geological Sciences
推荐引用方式 GB/T 7714	Cheng, Yongzhi,Gao, Rui,Chen, Jiuhui,et al. Crustal structure and geodynamics of the eastern Qilian orogenic belt, NE margin of the Qinghai-Tibet plateau, revealed by teleseismic receiver function[J],2023,11.
APA	Cheng, Yongzhi.,Gao, Rui.,Chen, Jiuhui.,Lu, Zhanwu.,Li, Wenhui.,...&Cai, Yuguo.(2023).Crustal structure and geodynamics of the eastern Qilian orogenic belt, NE margin of the Qinghai-Tibet plateau, revealed by teleseismic receiver function.FRONTIERS IN EARTH SCIENCE,11.
MLA	Cheng, Yongzhi,et al."Crustal structure and geodynamics of the eastern Qilian orogenic belt, NE margin of the Qinghai-Tibet plateau, revealed by teleseismic receiver function".FRONTIERS IN EARTH SCIENCE 11(2023).