气候变化领域集成服务门户(CCPortal): Uppermantle thermal structure in the southeastern margin of the Tibetan Plateau inferred from MT: A case study on Lanping-Guiyang section

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DOI	10.6038/cjg2022Q0471
	Uppermantle thermal structure in the southeastern margin of the Tibetan Plateau inferred from MT: A case study on Lanping-Guiyang section
	Wang XueYu; Zhu Tao; Guo YingXing
发表日期	2023
ISSN	0001-5733
起始页码	3335
结束页码	3352
卷号	66 期号:8
英文摘要	The southeastern margin of the Tibetan Plateau is the key position for the migration of soft material, and it is necessary to study its deep structure to understand the expansion mechanism of the Tibetan Plateau. In this dissertation, based on the relationship between the temperature and conductivity of upper mantle minerals and melts, the resistivity structure of a 750 km long magnetotelluric sounding (MT) profile across the southeast edge of the Tibetan Plateau, starting from the Lanping-Simao block, passing through the Sichuan-Yunnan block and terminating in the South China block, is used to obtain the upper mantle temperature structure and melting percentage distribution model in the study area. The results show that the whole upper mantle temperature can be reasonably obtained only by using the mineral composition model of water bearing melting upper mantle that varies with depth; the whole rock water content in weight percentage in the upper mantle is about 4.69 (40 km depth)similar to 0.13 wt% (150 km depth), the mineral melting percentage is about 0 similar to 1.4%, and there is an obvious local melting zone near 70 km depth; the temperature of the upper mantle increases with the depth, usually between 400 similar to 1300 degrees C the temperature above 70 km shows a relatively strong lateral variations trend, and the average values of upper mantle temperature and mineral melting percentage of Sichuan-Yunnan and Lanping-Simao blocks are significantly higher than those of South China block.
关键词	Southeastern margin of the Tibetan Plateau Upper mantle Thermal structure Melt fraction
英文关键词	NOMINALLY ANHYDROUS MINERALS; NATURAL MANTLE MINERALS; ELECTRICAL-CONDUCTIVITY; CRUSTAL STRUCTURE; SOUTHERN TIBET; EXPERIMENTAL DEFORMATION; EASTERN MARGIN; VARIATIONAL APPROACH; SEISMIC VELOCITIES; UPPERMOST MANTLE
WOS研究方向	Geochemistry & Geophysics
WOS记录号	WOS:001045501300015
来源期刊	CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283890
作者单位	China Earthquake Administration
推荐引用方式 GB/T 7714	Wang XueYu,Zhu Tao,Guo YingXing. Uppermantle thermal structure in the southeastern margin of the Tibetan Plateau inferred from MT: A case study on Lanping-Guiyang section[J],2023,66(8).
APA	Wang XueYu,Zhu Tao,&Guo YingXing.(2023).Uppermantle thermal structure in the southeastern margin of the Tibetan Plateau inferred from MT: A case study on Lanping-Guiyang section.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,66(8).
MLA	Wang XueYu,et al."Uppermantle thermal structure in the southeastern margin of the Tibetan Plateau inferred from MT: A case study on Lanping-Guiyang section".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 66.8(2023).