Citation: | ZENG Qinwang, LIU Yunhua, QIAN Tao, NING Juntao, WANG Haiyuan, HUANG Baoliang, ZHAO Chunhe, WANG Qian. 2020. The genesis of gold deposits in Xuefeng uplift zone[J]. Geology in China, 47(4): 914-931. doi: 10.12029/gc20200402 |
Based on basic knowledge in geosciences and instances of ore deposits, the authors firstly put forward the argument that gold within rocks in the Xuefeng uplift zone can't be mobilized, migrated and enriched for mineralization by low-grade regional metamorphism of such rocks as slate and meta-sandstone. The fault structure itself cannot be mineralized in the process of dynamic metamorphism. The content of gold in strata in the fracture zone is only 0.123% of that in the orebody. The metallogenic temperature of the gold deposit determined by fluid inclusions mainly ranges from 200 ℃ to 300 ℃, which indicates that the rock gold deposit in the Xuefeng uplift zone was not sourced from underground hydrothermal solutions. The similarity between some ore minerals, associated components, trace elements, and isotopic geochemistry of gold deposits and the similarity of granitic magmatic rocks show their genetic relationships. The gravitational and magnetic data suggest that there might exist a large concealed intrusion under the gold deposit where there are no magmatic rocks exposed on the surface. The above discussion and exclusion suggest that the genetic type of rock gold deposits in Xuefeng uplift belt is magmatic hydrothermal deposit.
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Geological map of Xuefeng uplift zone in Hunan
Geological map of gold vein Ⅰ1 and Ⅰ2 in Wangu mining area, Pingjiang County, Hunan Province
Comprehensive geological map of Huangjingdong- Wangu area in northeast Hunan Province
Inferred map of buried rock mass in Xuefeng uplift zone
Regional structural map of the Jintan mining area in Anhua County, Hunan Province
Diagram of of Au and W primary halo anomaly of exploration line 4 in Dawan gold mining area
Comparison of sulfur isotope values of gold deposits in northeast Hunan gold deposits in the strata
Hydrogen and oxygen isotopes of ore-forming fluids
Diagram of 40Ar/36Ar-3He/4He and40Ar*/4He-3He/4He of fluid inclusions in pyrite of the Wangu mining area
Diagram of quartz δD-δ18O in ore-bearing veins (solid circles) and ore-free veins (open circles) in the Wangu mining area
Comprehensive Information analysis of gold mine in the Jintan mining area