• Li Jinwen Affiliated with Institute of Mineral Resources, CAGS
• . Pei Rongfu Affiliated with Institute of Mineral Resources, CAGS
• . Zhang Dequan Affiliated with Institute of Mineral Resources, CAGS
• . Mei Yanxiong Affiliated with Institute of Mineral Resources, CAGS
• . Wang Lijuan Affiliated with Institute of Geology and Geophysics, CAS
• . Zhu Heping Affiliated with Institute of Geology and Geophysics, CAS

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Abstract

The Shizishan copper (gold) ore-field is the largest in the Tongling ore district. The field is characterized by complex metallogenic processes as indicated by its dominantly skarn-type and stratabound skarn-type deposits. These deposits are rich in fluid inclusions with homogenization temperatures that range from 140 to 570°C and salinities that range from 1.07 to 60.72 wt% NaCl equiv. The ore-forming fluids were magma-derived and behaved in a supercritical state in the early stage, and experienced an evolution from high-temperature and high-salinity to moderate-temperature and low-moderate-salinity. There was an addition of meteoric water during the fluid evolution. Temperature decrease, and decompression and boiling of the fluids were the main factors that led to the large enrichments of copper and gold.

Keywords

Ore-forming fluid fluid inclusions geochemistry copper Shizishan Tongling

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