3D inversion of audio-magnetotelluric data for mineral exploration: A case study of Layikeleke buried porphyry copper deposit, Xinjiang, China*

Abstract
References
Similar articles

Download: PDF (924 KB) HTML ( KB) Export: BibTeX | EndNote (RIS) Supporting Info

Abstract Layikeleke copper deposit is a large-scale porphyry copper polymetallic buried deposit, which has been discovered recently in the eastern Junggar area of Xinjiang. Mineralization occurred in the Late Silurian and Early Devonian with the copper body mainly confined to tonalite. To find new ore bodies, it is necessary to map the 3D spatial distribution of the tonalite. For this reason, we deployed audio-magnetotelluric (AMT) sounding in the research area, collected 26 profi les and 1198 measuring points, carried out 3D inversion calculations of off-diagonal elements in the impedance tensor data using the nonlinear conjugate gradient method, and obtained a 3D electrical structure model. The electrical structure reveals two groups of NW-SE trending middle and middle low resistivity anomaly zones, which intersect the high resistivity bedrock area in the northwest of the study area. Based on the electrical data, it can be inferred that the medium low resistance tonalite in the northern part of the study area is the host rock of the porphyry copper polymetallic deposit, which has been verified by borehole data. The results of 3D AMT inversion depict the spatial distribution and depth variation characteristics of the tonalite electrical structure model, providing a basis for further prospecting and exploration. Therefore, this method of identifying lithology by 3D inversion can provide an important basis for mineral exploration and mining of buried rock masses, and is an effective prospecting method.

	Service

	E-mail this article
	Add to my bookshelf
	Add to citation manager
	E-mail Alert
	RSS
	Articles by authors

Key words： AMT 3D inversion Layikeleke porphyry copper mine

Received: 2019-01-15;

Fund:

The research is supported jointly by the National Key Research and Development Program of China (No.2018YFC0604002), National Natural Science Foundation of China (No.41574133), Xinjiang Geological Exploration Fund (No. A11-3-XJ4) and China Geological Survey Project (No. DD20190017).

Corresponding Authors: Yan Jia-Yong (Email: yanjy@163.com)
E-mail: yanjy@163.com

About author: Fu Guang-Ming, a doctoral candidate at East China University of Technology, obtained his master’s degree from East China University of Technology in 2017. Currently, his research direction is geophysical threedimensional metallogenic prediction (E-mail: gmf2016GP@163.com). Correspondence author: Yan Jia-Yong, Ph.D. supervisor, obtained his doctoral degree in Solid Geophysics from the Chinese Academy of Sciences in 2010. His research direction is the deep exploration of the Earth and exploration for mineral resources.

Cite this article:

. 3D inversion of audio-magnetotelluric data for mineral exploration: A case study of Layikeleke buried porphyry copper deposit, Xinjiang, China*[J]. APPLIED GEOPHYSICS, 2020, 17(4): 576-588.

No references of article

[1]	Chen Xiang-Zhong, Liu Yun-He, Yin Chang-Chun, Qiu Chang-Kai, Zhang Jie, Ren Xiu-Yan, and Zhang Bo. Three-dimensional inversion of controlled-source audio-frequency magnetotelluric data based on unstructured finite-element method*[J]. APPLIED GEOPHYSICS, 2020, 17(3): 349-360.
[2]	Jing Lei, Yao Chang-Li, Yang Ya-Bin, Xu Meng-Long, Zhang Guang-Zhi, and Ji Ruo-Ye. Optimization algorithm for rapid 3D gravity inversion*[J]. APPLIED GEOPHYSICS, 2019, 16(4): 514-525.
[3]	Cao Xiao-Yue, Yin Chang-Chun, Zhang Bo, Huang Xin, Liu Yun-He, and Cai Jing. 3D magnetotelluric inversions with unstructured finite-element and limited-memory quasi-Newton methods[J]. APPLIED GEOPHYSICS, 2018, 15(3-4): 556-565.
[4]	Wang Tao, Wang Kun-Peng, Tan Han-Dong. Forward modeling and inversion of tensor CSAMT in 3D anisotropic media[J]. APPLIED GEOPHYSICS, 2017, 14(4): 590-605.
[5]	Wang Jun-Lu, Lin Pin-Rong, Wang Meng, Li Dang, Li Jian-Hua. Three-dimensional tomography using high-power induced polarization with the similar central gradient array[J]. APPLIED GEOPHYSICS, 2017, 14(2): 291-300.
[6]	Wang Kun-Peng, Tan Han-Dong, Wang Tao. 2D joint inversion of CSAMT and magnetic data based on cross-gradient theory[J]. APPLIED GEOPHYSICS, 2017, 14(2): 279-290.
[7]	Cao Meng, Tan Han-Dong, Wang Kun-Peng. 3D LBFGS inversion of controlled source extremely low frequency electromagnetic data[J]. APPLIED GEOPHYSICS, 2016, 13(4): 689-700.
[8]	Liu Yun-He, Yin Chang-Chun, Ren Xiu-Yan, Qiu Chang-Kai. 3D parallel inversion of time-domain airborne EM data[J]. APPLIED GEOPHYSICS, 2016, 13(4): 701-711.
[9]	Hu Ying-Cai, Li Tong-Lin, Fan Cui-Song, Wang Da-Yong, Li Jian-Ping. Three-dimensional tensor controlled-source electromagnetic modeling based on the vector finite-element method[J]. APPLIED GEOPHYSICS, 2015, 12(1): 35-46.
[10]	WANG Zhu-Wen, XU Shi, LIU Yin-Ping, LIU Jing-Hua. Extrapolated Tikhonov method and inversion of 3D density images of gravity data[J]. APPLIED GEOPHYSICS, 2014, 11(2): 139-148.
[11]	CHEN Xiang-Bin, LV Qing-Tian , YAN Jia-Yong. 3D electrical structure of porphyry copper deposit: A case study of Shaxi copper deposit[J]. APPLIED GEOPHYSICS, 2012, 9(3): 270-278.
[12]	LIN Chang-Hong, TAN Han-Dong, SHU Qing, TONG Tuo, ZHANG Yu-Mei. Three-dimensional interpretation of sparse survey line MT data: Synthetic examples*[J]. APPLIED GEOPHYSICS, 2012, 9(1): 9-18.
[13]	LIN Chang-Hong, TAN Han-Dong, TONG Tuo. Three-dimensional conjugate gradient inversion of magnetotelluric full information data[J]. APPLIED GEOPHYSICS, 2011, 8(1): 1-10.