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2020 Vol. 26, No. 3
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XUE Yushan, WANG Ruiting, WANG Chao, MEN Wenhui, LIU Xinwei, HU Xishun, NING Jiangchao, GU Yuming, SONG Shuguang. 2020. Ore-controlling rules of fault structures in the Wangjiaping gold deposit in Shanyang County, Shaanxi Province. Journal of Geomechanics, 26(3): 391-404. doi: 10.12090/j.issn.1006-6616.2020.26.03.034
Citation: XUE Yushan, WANG Ruiting, WANG Chao, MEN Wenhui, LIU Xinwei, HU Xishun, NING Jiangchao, GU Yuming, SONG Shuguang. 2020. Ore-controlling rules of fault structures in the Wangjiaping gold deposit in Shanyang County, Shaanxi Province. Journal of Geomechanics, 26(3): 391-404. doi: 10.12090/j.issn.1006-6616.2020.26.03.034
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Ore-controlling rules of fault structures in the Wangjiaping gold deposit in Shanyang County, Shaanxi Province

  • 1.

    Xi'an Northwest Research Institute of Nonferrous Metals Co., Ltd., Xi'an 710054, Shaanxi, China

  • 2.

    Shaanxi Engineering Technology Research Center of Comprehensive Utilization of Mineral Resources, Xi'an 710054, Shaanxi, China

  • 3.

    Northwest Nonferrous Geological and Mining Group Co., Ltd., Xi'an 710054, Shaanxi, China

  • 4.

    Mineral Resources Investigation and Evaluation Guidance Center of Shanxi Province, Xi'an 710075, Shaanxi, China

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Received Date:  20 April 2020
Revised Date:  17 May 2020
Publish Date:  30 June 2020
    Abstract

  • The Wangjiaping gold deposit in Shanyang County, Shaanxi province, is a newly discovered carlin-type gold deposit in the southern Qinling orogeny, characterized by obvious ore-controlling structure and developed mineralization and alteration. The mining area is located in the north wing of the Longtougou anticline. The Mantoushan-Daping-Yinghuahe fault F2 and its secondary fault F2-1 run through the whole area, and the ore body occurs in the south of the secondary interbedded fault. Based on the field survey and the classification of metallogenic periods, the tectonic types and their characteristics were sorted out, the tectonic ore-controlling rules were summarized, and the prospecting direction was proposed. Three periods about the ore-forming processes have been identified based on the detail petrography observation. The quartz-sulfides stage is the major ore-forming stage. Four trends of faults have been discovered in the Wangjiaping deposit. It is believed that the EW-trend fault was the main ore-bearing structure formed at Indosinian period, which also acted as the major ore-transmitting structure. The other trends of faults, including NE, NW and near SN-trend ones, were formed at Yanshanian Period, obviously cutting and shifting the ore bodies. The "#"-type structure formed by the NE, NW and EW-trend structures promoted the oxidation enrichment of the ore bodies, leading to the rich orebodies. Based on the study of ore-forming tectonic system of the deposit, the regularity of lateral prostration was discovered firstly, and the plunge angle is about 36° according to the calculation. The fault F2 and its secondary faults (e.g.F2-1) in the south, the deep part of orebody Ⅲ and the lateral direction area of orebody Ⅱ have great prospecting potential, and they are the primary areas for further prospecting.

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