投稿时间：2016-11-23
修订日期：2018-02-01
网络发布日期：2018-11-03
中文摘要:西藏隆子县恰嘎锑矿位于藏南喜马拉雅特提斯造山带的中东部，属藏南江孜-隆子金锑多金属成矿带。综合研究该矿床的石英流体包裹体特征和H-O-S同位素的组成，发现其流体成矿过程包括：黄铁矿-石英阶段发育富液相包裹体（W型），均一温度集中在170~180℃，盐度w（NaCleq）为2.86%~7.17%，成矿压力平均为47.15MPa，成矿深度平均为1.57 km；石英-硫化物阶段主要发育富液相包裹体（W型），其次为CO2-H2O三相包裹体（C型），均一温度位于200~220℃区间，盐度w（NaCleq）为2.20%~5.11%，成矿压力平均为47.46 MPa，成矿深度平均为1.58 km。矿区总体上流体属含微量CO2气体的中低温、低盐度的NaCl-H2O热液体系。H-O和S同位素结果表明存在地幔流体参与成矿，其赋矿浅变质沉积岩地层也为成矿提供了部分成矿流体，以上研究证明，恰嘎锑矿属于多来源流体浅层中低温矿床。
Abstract:Located in the central-eastern part of the Tethyan Himalayan tectonic belt, the Qiaga stibnite deposit belongs to the Jiangzi-Longzi Au-Sb polymetallic metallogenic belt. Based on the study of fluid inclusions in quartz and isotopic geochemistry of H-O-S analyzed in this study, The authors revealed that the hydrothermal ore-forming process included several stages:the pyrite-quartz assemblage stage, characterized by rich liquid inclusions (type W), with homogenization temperatures clustered at 170~180℃, salinities of 2.86%~7.17%, and average pressure of 47.15 MPa, corresponding to the ore-forming depth of 1.57 km; the quartz-sulfide assemblage stage featured mainly by liquid-rich inclusions (type W); and the third stage containing CO2-H2O three-phase inclusions (type C), having homogenization temperatures around 200~220℃, salinities of 2.20%~5.11%, and average pressure of 47.46 MPa, corresponding to an ore-forming depth of 1.58 km. On the whole, the fluid inclusions belong to the NaCl-H2O hydrothermal system of micrco-CO2 gas, medium-low temperature, low salinity. The results of H-O-S isotopic geochemistry shows that the ore-forming fluids originated from the mantle and/or the hosted-metamorphic sedimentary rocks. This evidence suggests that the Qiaga stibnite deposit belongs to a multiple sources fluid and shallow medium-low temperature deposit.
文章编号：
中图分类号：P618.66
文献标志码：
基金项目:本文得到中国地质调查局地质调查项目“西藏哲古-日当一带铅锌锑多金属矿产调查评价”（编号：12120114083501）和“西藏古堆地区金锑多金属矿产远景调查”（编号：1212011121236）联合资助
引用文本：
娄元林,陈武,袁永盛,杨桃.2018.西藏隆子县恰嘎锑矿床流体包裹体及H、O、S同位素组成特征[J].矿床地质,37(5):1124~1140LOU YuanLin,CHEN Wu,YUAN YongShen,YANG Tao.2018.Fluid inclusion and H, O, and S isotopic composition of Qiaga stibnite deposit in Longzi County, Tibet[J].Mineral Deposits37(5):1124~1140
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