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XIN Cunlin, XU Mingru, AN Guobao, HU Juying, YANG Tao, DONG Kai. 2019. Deposit geology, fluid inclusion characteristics and ore genesis of the Matoushan Cu-Au deposit in Southwest Sichuan Province[J]. Geology in China, 46(6): 1556-1572. doi: 10.12029/gc20190620
Citation: XIN Cunlin, XU Mingru, AN Guobao, HU Juying, YANG Tao, DONG Kai. 2019. Deposit geology, fluid inclusion characteristics and ore genesis of the Matoushan Cu-Au deposit in Southwest Sichuan Province[J]. Geology in China, 46(6): 1556-1572. doi: 10.12029/gc20190620
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Deposit geology, fluid inclusion characteristics and ore genesis of the Matoushan Cu-Au deposit in Southwest Sichuan Province

  • 1.

    College of Geography and Environmental Science, Northwest Normal University, Lanzhou 730070, Gansu, China

  • 2.

    No. 282 Geological Party, Sichuan Bureau of Geology for Nuclear Industry, Deyang 618000, Sichuan, China

  • 3.

    Faculty of Geomatics, Lanzhou Jiaotong University, Lanzhou 730071, Gansu, China

  • 4.

    College of Geography and Resources, China University of Geosciences, Wuhan 430074, Hubei, China

    • Fund Project: Supported by China Geological Survey(No. K15-1-LQ17), National Natural Science Foundation of China (No. 41262001)
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  • Author Bio: XIN Cunlin, male, born in 1967, professor, mainly engages in the study of geology and mineral resources; E-mail:xincunling@163.com
Received Date:  30 July 2018
Revised Date:  27 December 2018
Publish Date:  25 December 2019
    Abstract

  • The Matoushan copper-gold deposit is located in the Kangding-Jinping mountain metallogenic concentration area. It is located in the junction of the Jinping-kangding-Shuicheng fault. It is a one of medium-size copper gold deposit in Southwest Sichuan Province. Ore bodies was presented as sulfide quartz vein, which occur in Devonian carbonated mudstone limestone and Permian metamorphic basalt. They are obviously controlled by structures. Pyrite, bornite, chalcopyrite and galena are common sulfide minerals in the ore. The observation of primary fluid inclusions of quartz in the ore and Laser Raman spectroscopy analysis show that, the ore-forming fluid of Matoushan Cu-Au deposit is a system of H2O-CO2-NaCl, the average temperature of fluid inclusions ranged from 108.1 to 439.1℃, and the salinity ranged from 3.55% to 22.78% NaCleq with a density ranged of 0.51 to 1.12 g/cm3, the fluid inclusions at the major metallogenic stage has the characteristics of medium temperature, medium-low salinity, low density, and rich in CO2. The δ34SV-CDT was -4.6‰ to 8.4‰ of sulfide minerals in ores, indicating that the characteristics of S isotopic are from the magmatic; the primary fluid inclusions in quartz veins are δD=-78.8‰—-48.7‰ and δ18OH2O=-2.1‰-9.3‰, the carbon and oxygen isotopic compositions of the dolomite are δ13CV-PDB=-5.3‰-1.7‰ and δ18OV-SMOW=19.4‰-25.9‰, which indicates that the ore-forming fluid is magmatic water-mixed with meteoric water and formation fluid. Based on the geological features of ore deposit, fluid inclusions and the isotopic evidence of S, C, O and H, it can ben concluded that the Matoushan coppergold deposit belongs to the type of medium-low temperature-magmatic hydrothermal Cu-Au deposit.

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