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DENG Nan, LIU Yunhua, ZHAO Qiang, et al. Geological Characteristics and Genesis of the Tangba Gold Deposit in Wudu, Gansu Province[J]. Northwestern Geology, 2019, 52(4): 194-205.
Citation: DENG Nan, LIU Yunhua, ZHAO Qiang, et al. Geological Characteristics and Genesis of the Tangba Gold Deposit in Wudu, Gansu Province[J]. Northwestern Geology, 2019, 52(4): 194-205.
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Geological Characteristics and Genesis of the Tangba Gold Deposit in Wudu, Gansu Province

  • 1. School of Earth Science and Resources, Chang'an University, Xi'an 710054, Shaaxi, China;

  • 2. Third Institute Geological and Mineral Exploration of Gansu Provincial Bureau of Geology and Mineral Resources, Lanzhou 730000, Gansu, China

More Information
  • Received Date: April 23, 2019
  • Revised Date: May 29, 2019
  • Available Online: July 28, 2022
  • Published Date: December 04, 2019
    Graphical Abstract
    • Abstract
  • The Tangba gold deposit is located at the eastern section of the Yangshan-Shijiba gold mineralization belt in the southern part of the Western Qinling. The ore body is occurred in the strata of Paleozoic Lower Devonian Qiaotou Formation, which is closely related to the granite porphyry vein in space. The ore body and the vein are controlled by the fault in the fold's axial part. The ore body is occurred as veined and lens texture. The ore minerals are mainly pyrite and arsenopyrite, and the surrounding rock alterations are mainly silicification, sericitization and carbonation. The δ18OH2O(V-SMOW) values of main ore-forming fluid vary from 7.89‰ to 9.97‰, δD(V-SMOW) values range from -81.3‰ to -77.0‰, and the pyrite δ34S(‰) change from -1.3‰ to 0.8‰, with an average of -0.23‰, showing the characteristics of deep source sulfur. The zircon U-Pb dating age is (212.8±2.7)Ma for granite porphyry. The test analysis of fluid inclusions in this mining area shows that the ore-forming hydrothermal fluid has the characteristics of medium-low temperature and low salinity. The complete uniform temperature range of CO2 phase in the main ore-forming period is 252.6℃~342.8℃, with an average of 279.72℃. The volume uniform temperature range is 156.9℃~307.6℃, and their average value is 256.7℃. The comprehensive study considers that this deposit belongs to a medium-low temperature magmatic hydrothermal gold deposit associated with magmatic activity.
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