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Geoscience ›› 2021, Vol. 35 ›› Issue (05): 1411-1424.DOI: 10.19657/j.geoscience.1000-8527.2021.110

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Regional Geochemical Survey in the Area of Shuangjianzishan Ag-polymetallic Deposit in Inner Mongolia, China

ZUO Yushan1(), GONG Qingjie2(), JIANG Biao3, ZHANG Tong4, WU Xuan5, YAN Taotao6   

  1. 1. Inner Mongolia Key Laboratory of Magmatic Mineralization and Ore-Prospecting, Hohhot, Inner Mongolia 010020, China
    2. School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China
    3. Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037,China
    4. Xi’an Institute of Earth Environmental Innovation, Xi’an, Shaanxi 710061,China
    5. Development and Research Center, China Geological Survey, Beijing 100037, China
    6. Institute of Geophysical and Geochemical Exploration, Chinese Academy of Geological Sciences, Langfang, Hebei 065000, China
  • Received:2021-06-10 Revised:2021-09-01 Online:2021-10-10 Published:2021-11-04
  • Contact: GONG Qingjie

Abstract:

The Giant Shuangjianzishan Ag-polymetallic deposit in Inner Mongolia is currently the largest Ag-polymetallic deposit in China and even Asia. Based on the review of the discovery history of the deposit, the geochemical data on the regional geochemical survey are being reprocessed using new methods. A 19 levels of cumulative frequency method is used to map the analyzed 39 elements or major oxides and the results indicate that the major oxides or elements up to 22 items such as MgO, CaO, Fe2O3, Pb, Zn, Ag, V, Cr, Ni, etc. are enriched in the deposit area. The enrichments of major oxides may be resulted from the parent rocks in this area. The seven levels’ classification method on the geochemical anomaly with unfixed backgrounds is adopted to draw the single-element geochemical anomaly map for the 29 trace elements and the results indicate that only 9 elements such as W, Sn, Mo, Bi, Pb, Zn, Ag, As, and Sb have anomalies in or around the deposit area. Therefore, the enrichments of other trace elements in the deposit area may be caused by the parent rocks or their weathering. The recently presented method of geochemical gene is applied in this area and the mineralization similarity of metallogene is used as an integrated index to recognize the geochemical anomalies. The results indicate that the mineralization similarities of gold metallogene and tungsten metallogene all occur anomalies in or around the deposit area which reflects the ore-forming potential in the deposit area. The aforementioned results illustrate the regional geochemical survey is a useful method in the exploration of the Shuangjianzishan Ag-polymetallic deposit.

Key words: discovery history of deposit, cumulative frequency method, seven levels’ classification, geochemical gene, mineralization similarity

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