气候变化领域集成服务门户(CCPortal): Self-Potential Tomography of a Deep-Sea Polymetallic Sulfide Deposit on Southwest Indian Ridge

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DOI	10.1029/2020JB019738
	Self-Potential Tomography of a Deep-Sea Polymetallic Sulfide Deposit on Southwest Indian Ridge
	Zhu Z.; Tao C.; Shen J.; Revil A.; Deng X.; Liao S.; Zhou J.; Wang W.; Nie Z.; Yu J.
发表日期	2020
ISSN	21699313
卷号	125 期号:11
英文摘要	Deep-sea polymetallic sulfides associated with hydrothermal systems are considered a potential viable resource for base and precious metals. The Southwest Indian Ridge (SWIR, Indian Ocean) hosts active and inactive hydrothermal systems. Inactive hydrothermal fields are more abundant than active fields but are difficult to remotely characterize. We report a deep-sea self-potential investigation to locate inactive ore deposits at the Yuhuang hydrothermal field on the ultraslow-spreading SWIR. A horizontal array of six nonpolarizing AgCl electrodes are attached to a deep-towed transient electromagnetic system to record the electrical field at a height of 40 m above the seafloor. The observed electrical field strength near a previously recognized sulfide deposits (verified by drilling) reaches an amplitude of 0.5 mV/m. Negative self-potential anomalies (~ −27 mV) were observed by integrating the measured electrical field. The high electrical conductivities (up to 12 S/m) of sulfide samples measured in the laboratory and the oxidized sulfides recovered from the surface of the deposit suggest that the self-potential anomalies are due to sulfide mineralization and corrosion of the polymetallic sulfides. Inversion of the self-potential data reveals a localized body with a thickness of ~65 m, which is interpreted as the Yuhuang ore deposit. Our field data demonstrate that the self-potential method is a useful exploration method to identify and image seafloor massive sulfide deposits hosted in inactive hydrothermal fields at mid-ocean ridges. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	inactive hydtrothermal field; marine self-potential; redox process; seafloor massive sulfide; self-potential tomography; Southwest Indian Ridge
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/187507
作者单位	State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing), Beijing, China; Key Laboratory of Submarine Geosciences, Second Institute of Oceanography, MNR, Hangzhou, China; School of Oceanography, Shanghai Jiaotong University, Shanghai, China; Université Grenoble Alpes, Université Savoie Mont-Blanc, CNRS, UMR CNRS 5204, EDYTEM, Le Bourget-du-Lac, France; Ocean College, Zhejiang University, Zhoushan, China
推荐引用方式 GB/T 7714	Zhu Z.,Tao C.,Shen J.,et al. Self-Potential Tomography of a Deep-Sea Polymetallic Sulfide Deposit on Southwest Indian Ridge[J],2020,125(11).
APA	Zhu Z..,Tao C..,Shen J..,Revil A..,Deng X..,...&Yu J..(2020).Self-Potential Tomography of a Deep-Sea Polymetallic Sulfide Deposit on Southwest Indian Ridge.Journal of Geophysical Research: Solid Earth,125(11).
MLA	Zhu Z.,et al."Self-Potential Tomography of a Deep-Sea Polymetallic Sulfide Deposit on Southwest Indian Ridge".Journal of Geophysical Research: Solid Earth 125.11(2020).