河南省汤家坪斑岩钼矿流体包裹体地球化学及其矿床成因意义

The Geochemical Characteristics of Fluid Inclusion and Its Mineralization Significance of the Tangjiaping Mo Deposit in Henan Province

河南商城县汤家坪斑岩钼矿床位于大别造山带。流体包裹体岩相学、显微测温分析及激光拉曼显微探针分析表明汤家坪钼矿床石英中流体包裹体可划分为I型气液包裹体（V-L FI）、Ⅱ型富（含）二氧化碳包裹体（CO2-FI）;Ⅲ型含子晶多相包裹体（S-FI）三类。流体包裹体均一温度集中于107.3515.6℃,以220375℃对成矿最为有利;盐度重量百分含量集中于0.53%16.91%及26.24%60.32%。激光拉曼显微探针分析表明成矿流体中含有少量C2H6及SO2气体。根据最有利成矿温度结合流体包裹体地质温压计,推算汤家坪斑岩钼矿的可能成矿深度为2.8 km。对Ⅲ型包裹体（S-FI）显微测温数据分析表明,斑岩钼矿的成矿深度为2.64.4 km,因此认为其成矿深度为3 km左右。流体成矿过程中沸腾现象明显,不同包裹体中CO2含量差异很大,显示流体沸腾发生在开放体系之中。

The Tangjiaping Mo deposit in Shangcheng County,Henan Province is located in Dabie orogenic belt.In quartz three types of fluid inclusions can be observed based on the petrography,microthermometric measurement and Laser Raman microprobe anlysis.They are aqueous solution fluid inclusions(V-L FI),CO_2-rich(bearing) fluid inclusions(CO_2-FI) and daughter-crystal-bearing fluid inclusions(S-FI).The homogenization temperatures vary from107.3℃ to 515.6℃,where the most c temperatures are ranging from 220-375t;the calculated fluid salinites cluster in two ranges,0.53-16.91 wt%and 26.24-60.32 wt%.Laser Raman microprobe anlysis indicated that the ore-fluids contains a small quantity of C_2H_6 and SO_2.The possible ore-froming depth is about 2.8 km,when calculated by fluid inclusions geothermometer and geobarometer.While according to the anlysis of homogenization temperatures of daughter-crystal-bearing fluid inlusions,the ore-forming depth is ranging from 2.6-4.4 km.The fluids boiling can be recognized,and the varying mole percent of CO_2 indicates it happened in an open system.