广西大厂矿田深部成矿预测及成矿机制研究

doi:10.11720/wtyht.2021.1401

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Abstract

As one of the large tin-polymetallic deposits in the world, the Dachang deposit has complicated metallogenic mechanism and rich hidden mineral resources. In order to detect the distribution and study mineralization mechanism of the concealed deposits around the cage and cover rock in the Dachang ore district, the authors finely processed the audio magnetoelectromagnetic data covering the Dachang ore district, and obtained a two-dimensional electrical structure model within the depth of 3 km. According to the results of resistivity model, the location of concealed granite and orebody was determined. Granite is characterized by high resistance and is buried at a depth of about 1.5 km, with the formation of ridge uplift along the fault structure. The low-resistivity orebody is located in the middle Devonian strata at the top of granite, so it is inferred that the orebody was developed from the granite at the bottom, which indicates that granite has an obvious ore-controlling effect. According to the zonal characteristics of copper in the near place and tin in the distant place as well as anomalies of metallic elements in the Dachang ore district, it is most possible to find skarn type Zn-Cu deposits and Sb-W deposits. The research shows that, in the late Cretaceous period, the magmatic hydrothermal fluids of the middle and lower crust together with a small amount of upper mantle rose to the shallow Devonian strata of the crust along the basement fault in the NW direction, and then formed mineralization with surrounding rocks through crystallization differentiation.

Key words： Dachang deposit audio magnetotelluric sounding resistivity metallogenic prediction ore-forming mechanism

Received: 11 August 2020 Published: 29 April 2021

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P631

Corresponding Authors: JING Jian-En E-mail: jje2008@cugb.edu.cn

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	Cheng-Gong LIU
	Jian-En JING
	Sheng JIN
	Wen-Bo WEI

Cite this article:

Cheng-Gong LIU,Jian-En JING,Sheng JIN, et al. A study of deep metallogenic prediction and metallogenic mechanism of the Dachang deposit in Guangxi[J]. Geophysical and Geochemical Exploration, 2021, 45(2): 337-345.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2021.1401 OR https://www.wutanyuhuatan.com/EN/Y2021/V45/I2/337

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1—fracture; 2—anticline; 3—ore field; 4—granite;5—basin boundary; 6—speculative granite
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Structure and mineral distribution map of The Danchi metallogenic belt (modified by Xu Xinhuang et al^[12])
1—fracture; 2—anticline; 3—ore field; 4—granite;5—basin boundary; 6—speculative granite

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Geological structure and mineral distribution map of the large factory ore field (modified by Cai Minghai et al^[16])

Apparent resistivity and phase diagram of some measuring points

Strike analysis results for the specific corresponding frequency band

Model roughness and fitting difference curve of inversion by different regularization factors

Resistivity map of Dachang deposit

Metallogenic model diagram of Dachang deposit(modified by data of the 215 geological team,Guangxi province)

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