气候变化领域集成服务门户(CCPortal): New Insights Into Crustal and Mantle Flow Beneath the Red River Fault Zone and Adjacent Areas on the Southern Margin of the Tibetan Plateau Revealed by a 3-D Magnetotelluric Study

CCPortal

DOI	10.1029/2020JB019396
	New Insights Into Crustal and Mantle Flow Beneath the Red River Fault Zone and Adjacent Areas on the Southern Margin of the Tibetan Plateau Revealed by a 3-D Magnetotelluric Study
	Yu N.; Unsworth M.; Wang X.; Li D.; Wang E.; Li R.; Hu Y.; Cai X.
发表日期	2020
ISSN	21699313
卷号	125 期号:10
英文摘要	A number of geodynamic models have been proposed for the southeastern margin of the Tibetan plateau and include a range of deformation processes. One unresolved issue is whether crustal and mantle flow occurs, and if it does, how flow contributes to the mass balance of the India-Asia collision. To address this question, new magnetotelluric data were collected and used to derive a three-dimensional electrical resistivity model of the crust and upper mantle beneath the Red River Fault (RRF) zone and adjacent areas. The most prominent features of the model are (1) a resistor in the upper-middle crust directly beneath the trace of the RRF; (2) a major change in upper mantle resistivity across the RRF; and (3) a significant conductor in the upper mantle northeast of the RRF, which extends upward into the crust, and which requires a melt fraction of up to 3%. The model suggests that the lower crustal conductors may be due to melt/fluids derived from the mantle, rather than from outward flow from Tibet. The most likely source of fluids and melts could be upwelling mantle flow related to the Hainan mantle plume. The change in resistivity across the RRF implies a change in lithospheric strength may explain the present-day localization of deformation and uplift at this location. The resistivity model may also give insights into the distribution of ore deposits in Ailao Shan, since many mineral deposits are derived from magmatic fluids generated in the mantle at the edges of regions of thick lithosphere. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	dynamic mechanism; magnetotelluric; mantle flow; ore deposits; Red River Fault; three-dimensional inversion
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187546
作者单位	School of Electrical Engineering, Chongqing University, Chongqing, China; Department of Physics, University of Alberta, Edmonton, AB, Canada; Key Laboratory of Earth exploration and Information Technique, Chengdu University of Technology, Chengdu, China
推荐引用方式 GB/T 7714	Yu N.,Unsworth M.,Wang X.,et al. New Insights Into Crustal and Mantle Flow Beneath the Red River Fault Zone and Adjacent Areas on the Southern Margin of the Tibetan Plateau Revealed by a 3-D Magnetotelluric Study[J],2020,125(10).
APA	Yu N..,Unsworth M..,Wang X..,Li D..,Wang E..,...&Cai X..(2020).New Insights Into Crustal and Mantle Flow Beneath the Red River Fault Zone and Adjacent Areas on the Southern Margin of the Tibetan Plateau Revealed by a 3-D Magnetotelluric Study.Journal of Geophysical Research: Solid Earth,125(10).
MLA	Yu N.,et al."New Insights Into Crustal and Mantle Flow Beneath the Red River Fault Zone and Adjacent Areas on the Southern Margin of the Tibetan Plateau Revealed by a 3-D Magnetotelluric Study".Journal of Geophysical Research: Solid Earth 125.10(2020).