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Global Geology 2020, 23(2) 78-91 DOI: 10.3969/j.issn.1673-9736.2020.02.02 ISSN: 1673-9736 CN: 22-1371/P

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	Beiya
	Au polymetallic deposit
	hydrothermal evolution
	porphyry-skarn deposit
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Hydrothermal evolution and source of metallogenic materials of Beiya Au polymetallic deposit, western Yunnan, China

DENG Jiafang, SUN Fengyue, XIN Wei, XU Zhihe, PAN Zhongcui, WU Dongqian, TIAN Nan

College of Earth Sciences, Jilin University, Changchun 130061, China

摘要： The Beiya porphyry-skarn gold-polymetallic deposit is one of the largest gold deposits in China and it also contains significant amounts of silver and base metals. The ore-bearing monzonitic granite porphyry occurs as a stock, of which the skarn type gold-copper-iron ore bodies are controlled by the contact zone between alkali-rich monzonitic granite porphyry and the limestone, and the gold-silver polymetallic mineralization is controlled by interlayer structure. Alteration and mineralization occur around the intrusion and exterior of monzonitic granite porphyry. Ore mineral formation sequence is as follows: skarn minerals→magnetite→pyrite→chalcopyrite/bornite+pyrite+gold→pyrite+galena+gold (silver). Petrographic studies of fluid inclusions indicate that the following types of inclusions exist in the pre-mineralization quartz-pyrite stage: gas-liquid two-phase inclusions (L-type), three-phase inclusions with daughter minerals (D-type) and gas-rich inclusions (V-type). The colorless transparent quartz in the main gold-chalcopyrite-pyrite stage mainly consists of L-type and V-type inclusions, whereas the inclusions in the late gold-silver-galena stage are mainly L-type. The evolution of ore-forming fluids shows a trend from high temperature, high salinity to medium-low temperature and low salinity. Medium-low density fluids play a dominant role in mineral component migration and transportation. Fluid cooling and boiling are the main mechanisms of gold-copper precipitation, while the involvement of atmospheric water and pH reduction are the main mechanisms of gold-silver polymetallic precipitation. The fluids in the quartz-pyrite stage before mineralization and the main gold-chalcopyrite-pyrite stage are dominated by magmatic water, while in the gold-silver-galena stage the fluids are dominated by atmospheric water. Isotope tracers show that S and Pb are mainly derived from monzonitic granite porphyry, not from limestone of the Beiya Formation.

关键词： Beiya Au polymetallic deposit hydrothermal evolution porphyry-skarn deposit

Hydrothermal evolution and source of metallogenic materials of Beiya Au polymetallic deposit, western Yunnan, China

DENG Jiafang, SUN Fengyue, XIN Wei, XU Zhihe, PAN Zhongcui, WU Dongqian, TIAN Nan

College of Earth Sciences, Jilin University, Changchun 130061, China

Abstract: The Beiya porphyry-skarn gold-polymetallic deposit is one of the largest gold deposits in China and it also contains significant amounts of silver and base metals. The ore-bearing monzonitic granite porphyry occurs as a stock, of which the skarn type gold-copper-iron ore bodies are controlled by the contact zone between alkali-rich monzonitic granite porphyry and the limestone, and the gold-silver polymetallic mineralization is controlled by interlayer structure. Alteration and mineralization occur around the intrusion and exterior of monzonitic granite porphyry. Ore mineral formation sequence is as follows: skarn minerals→magnetite→pyrite→chalcopyrite/bornite+pyrite+gold→pyrite+galena+gold (silver). Petrographic studies of fluid inclusions indicate that the following types of inclusions exist in the pre-mineralization quartz-pyrite stage: gas-liquid two-phase inclusions (L-type), three-phase inclusions with daughter minerals (D-type) and gas-rich inclusions (V-type). The colorless transparent quartz in the main gold-chalcopyrite-pyrite stage mainly consists of L-type and V-type inclusions, whereas the inclusions in the late gold-silver-galena stage are mainly L-type. The evolution of ore-forming fluids shows a trend from high temperature, high salinity to medium-low temperature and low salinity. Medium-low density fluids play a dominant role in mineral component migration and transportation. Fluid cooling and boiling are the main mechanisms of gold-copper precipitation, while the involvement of atmospheric water and pH reduction are the main mechanisms of gold-silver polymetallic precipitation. The fluids in the quartz-pyrite stage before mineralization and the main gold-chalcopyrite-pyrite stage are dominated by magmatic water, while in the gold-silver-galena stage the fluids are dominated by atmospheric water. Isotope tracers show that S and Pb are mainly derived from monzonitic granite porphyry, not from limestone of the Beiya Formation.

Keywords: Beiya Au polymetallic deposit hydrothermal evolution porphyry-skarn deposit

收稿日期 2019-08-29 修回日期 2019-11-25 网络版发布日期

DOI: 10.3969/j.issn.1673-9736.2020.02.02

基金项目:

Supported by Project of China Geological Survey(No.1212011085485).

通讯作者: SUN Fengyue

作者简介:

作者Email: sfy@jlu.edu.cn

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