流体包裹体中微量气体组成及其成矿示踪体系研究新进展

N2 Ar He体系可用以示踪成矿流体及温泉等与火山有关的水流体的来源 ,当体系中He含量低于检出限 ,N2 Ar He体系不能用时 ,CO2 /CH4 N2 /Ar体系可用于识别成矿流体中岩浆水、建造水和大气降水 ,CO2 CH4 H2 体系可以鉴别成矿流体是否发生过沸腾作用以及沸腾是在开放体系还是封闭体系中形成 ,一般开放体系中沸腾有利于成矿。CO2 CH4 C2 H6体系可用于判别岩浆作用是否直接影响成矿或对成矿流体的贡献 ,从而确定热液矿床的成因。CH4 C2 H6 C3 H8体系可用来示踪一些与干酪根热解有关的成矿流体长距离、大规模迁移过程。C2 H6 C3 H8 C6H6体系可用于判定成矿流体的大地构造环境 ,因岛弧与裂谷环境下C2 H6/C3 H8比值有明显差异。以广东长坑 (Au Ag)和嵩溪 (Ag Sb)矿床为例 ,概述了这些体系各自的应用

NEW ADVANCES IN RESEARCH OF TRACE GASEOUS COMPOSITIONS IN FLUID INCLUSIONS AND THEIR APPLICATIONS AS INDICATORS OF ORE-FORMING FLUID SOURCES AND PROCESSES

The N_2-Ar-He system is used to indicate the source of the hot springs and ore-forming fluids,CO_2/CH_4-N_2/Ar system is used when the He-content is lower than the detection limit and the N_2-Ar-He system is not valid. CO_2-CH_4-H_2 system is used to identify the boiling in an open or a closed system. Generally an open system is favorable for metallogenesis. CO_2-CH_4-C_2H_6 system can be applied to indicate the contribution of magmatism in ore-forming processes and discriminate the sources of the ore-forming fluid. CH_4-C_2H_6-C_3H_8 system is used to indicate whether a long way and large scale ore-forming fluid migration occurred when the fluid contains light hydrocarbon related to the decomposition of kerogen. C_2H_6-C_3H_8-C_6H_6 system is good at indicating the tectonic environment of the ore-forming fluids, because the C_2 H_6/C_3H_8 ratio varies greatly in island arcs and rift tectonic settings. Taking Changkeng (Ag, Au) and Songxi (Ag, Sb) deposits in Guangdong Province, China as examples, the authors briefly introduce the respective application of these systems.