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Geoscience ›› 2021, Vol. 35 ›› Issue (05): 1363-1370.DOI: 10.19657/j.geoscience.1000-8527.2021.19

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Metallogenic Characteristics and Its Prospecting Significance of the Sanjiaoding Gold Deposit in the Northern Margin of Qaidam Basin

LU Yongzhuo1,2(), HAN Jie1,2(), WANG Ming1,2, YU Fucheng1,2, WANG Taishan1,2, YUAN Bowu1,2   

  1. 1. Key Laboratory of the Northern Qinghai-Tibet Plateau Geological Processes and Mineral Resources,Xining,Qinghai 810012, China
    2. Qinghai Geological Survey Institute, Xining, Qinghai 810012, China
  • Received:2021-04-08 Revised:2021-06-21 Online:2021-10-10 Published:2021-11-04
  • Contact: HAN Jie

Abstract:

The Sanjiaoding gold deposit is the only “Linglong-like” gold deposit in intermediate-acid intrusions found in the northern margin of Qaidam Basin, which is very important in regional prospecting. This paper compiled the geological characteristics of the deposit, type of ores, primary features of halos of the ores and rocks, the characteristics of fluid inclusions in the gold-bearing quartz veins, and related regional metallization events, and further investigated the metallogenic characteristics and prospecting significance of the deposit. The gold-bearing quartz veins and gold-bearing silicified mylonites resulted from the combined effects of multi-stage fluid activities with various compositions in the Sanjiaoding area. Fluid inclusions hosted in the gold-bearing quartz veins show features of shallow medium-low temperature and medium-low salinity, and are genetically related to magmatism. The gold-bearing silicified mylonite-type ores are caused by regional dynamic metamorphism. The mineralization depth of the Sanjiaoding gold deposit increases from west to east, and the quartz-vein type in the western ore deposit fields represents the top of the system of this period, forming a dome-like gold mineralization layer. Such dome-like gold mineralization layer of the quartz-vein type in the west segment and the gold-bearing mylonitization zone in the east segment, have great potential targets for further prospecting.

Key words: gold-bearing quartz vein, gold-bearing silicified mylonite, metallogenic characteristics, prospecting significance, Sanjiaoding gold deposit, northern margin of Qaidam Basin

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