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Geoscience ›› 2019, Vol. 33 ›› Issue (04): 727-737.DOI: 10.19657/j.geoscience.1000-8527.2019.04.04

• Petrology,Mineralogy,Ore Deposits • Previous Articles     Next Articles

Geophysical and Geochemical Characteristics of Cryptoexplosive Breccias at Tanshang, Daixian, Shanxi Province and Their Geological Significance

HOU Yanming1(), WANG Yunzhang1(), XU Yongjing2, ZHANG Xuemei3   

  1. 1. No.211 Geological Party, Bureau of Geology Exploration in Shanxi Province, Xinzhou, Shanxi 034000, China
    2. No.217 Geological Party, Bureau of Geology Exploration in Shanxi Province, Datong, Shanxi 037008, China
    3. School of Gemmology, China University of Geosciences, Beijing 100083, China
  • Online:2019-08-20 Published:2019-09-05
  • Contact: WANG Yunzhang

Abstract:

Cryptoexplosive breccia type gold deposit is an important and economic deposit. We conducted a detailed geological investigation of the Tanshang Au-polymetallic deposit in Daixian County, Shanxi Province, and analyzed its geophysical and geochemical characteristics. Combining petrographic studies of the cryptoexplosive breccias, it is revealed that the Au-polymetallic ores were formed by the local enrichment of sulfides in the quartz porphyry, which is in the Tanshang intrusive complex, the endo-/exo-contact zones of the intrusion and xenoliths from the Sijizhuang Formation. The ore-forming materials were mainly from the post-magmatic hydrothermal altered Tanshang intrusion, while the ore host is the pyritized cryptoexplosive breccia. The faults and its secondary structures may have provided the fluid conduits and ore depositional sites for the mineralization. The ore-forming material and fluids were mainly from the post magmatic hydrothermal alteration of Yanshanian intermediate-acidic (sub-) hypabyssal rocks in this area.

Key words: cryptoexplosive breccia, gold deposit, geophysical characteristic, geochemical characteristic, Tanshang,Daixian County,Shanxi Province

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