摘要
根据稳定同位素地球化学和包裹体测试结果等资料阐述了成矿溶液的性质、成矿物理化学条件及成矿金属组分迁移、沉淀机制,用大本模式图解模拟了成矿过程中物化条件演化趋势,重溯了成矿时的地球化学环境,并在此基础上解释了白银厂矿床为Cu-Zn型矿床的原因。
Baiyinchang massive sulfide deposit is situated in Northern Qilian Mountains. Stable isotopic geochemistry and informations of gas-fluid inclusions indicated that. ore-forming hydrothermal belongs to Ca-rich NaCl-H_2O-KCl type, T=250—300℃, P=2.5×10~7Pa—3.1×10~7 Pa, pH=6—8, fs_2=10^(-12), fo_2=10^(-85), δ^(84)S∑s=+4‰, δ^(18)C_(Cc)=0‰. By means of Ohmoto model(1972), cvoluted trench of ore deposited physieoehemistry conditions can be seen as fo_2 increased while T, fs_2 and pH decreased (from early to later). The special geochemical environment in ore-forming process luoles that Baiyinchang is Cu-Zn type deposit.
出处
《西北地质科学》
1992年第1期17-26,共10页
Northwest Geoscience
关键词
硫化物矿床
地球化学
白银矿
银矿
massive sulfide deposit geochemistry Baiyinchang
