摘要
长坑金银矿床的流体包裹体以单相液体和两相气液包裹体为主，气体和气液包裹体共存反映流体曾发生沸腾作用。成矿流体的温度为300～170℃，压力为20×106～45×106Pa，属于中-低盐度、较高密度的弱改-弱碱性热液。成矿流体的总硫浓度为10-5～10－2m数量级，氧逸度和疏逸度分别为lgfo2=－32~－50和lgfs2=－10^-20。早期流体为K－Ca－CI型，后期演化为Ca－Na－CI型，流体成分有别于典型的现代海底热液（热水）。
There are mainly two types of fluid inclusions,i. e.,mono-phase liquid type and liquid-dominated two-phase type,in the Changkeng gold-silver deposit,in addition to minor gas-type in-clusions coexisting with liquid-dominated-type inclusions,which reflects boiling of the ore-formingfluids- The temperatures and pressures of mineralizing fluids which are weakly acid to weakly ba-sic solutions with moderate-low salinities and relatively high densities range from 3OO'Cto 17OCand from 2O to 45 MPa, respectively. The concentration of total sulfur in the ore^forming solutionsis on the 10-5-10 -2 magnitude order, while logfo2= - 32~ - 50 and logfs2: =-1O^- 20. Themineralizing fluids are of the K-Ca-Cl type in the early stage,f ol1owed by the evolution into the Ca-Na-Cl type during the late stage,whose compositions are significantly different from those of thetypical hydrothermal solutions in modern sea floor.
出处
《矿物学报》
CAS
CSCD
北大核心
1998年第1期38-45,共8页
Acta Mineralogica Sinica
基金
中国科学院黄金办科研基金
中科院博士点基金
关键词
金矿床
银矿床
成矿流体
地球化学
液包体
fluid inclusion
ore-forming fluid
gold-silver deposit
Guangdong
