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现代地质 ›› 2015, Vol. 29 ›› Issue (3): 553-562.

• 矿床学 • 上一篇    下一篇

藏南吉松铅锌矿流体包裹体特征及其地质意义

尹远1,2，梁维3，谢锦程1，张继军4   

  1. (1.中国地质大学(北京)地球科学与资源学院，北京 100083；
    2.中国科学院 地球化学研究所 地球内部物质高温高压院重点实验室，贵州 贵阳 550002；
    3.中国地质调查局 成都地质调查中心，四川 成都 610081；4.陕西省地质调查中心，陕西 西安 710068)
  • 出版日期:2015-06-10 发布日期:2015-07-08
  • 作者简介:尹远，男，硕士研究生，1992年出生，矿物学、岩石学、矿床学专业，主要从事矿床学和矿床地球化学研究工作。Email:1303092952@qq.com。
  • 基金资助:

    中国地质调查局项目(12120113037900，12120114050701，12120113036000)。

Characteristic of Fluid Inclusions in Jisong Pb-Zn Deposit in South Tibet and Its Geological Significance

YIN Yuan1,2，LIANG Wei3，XIE Jin-cheng1，ZHANG Ji-jun4   


  1. (1.School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China；
    2.Key Laboratory of High-temperature and High-pressure Study of the Earth’s Interior, Institute of Geochemistry,Chinese Academy of Sciences,
    Guiyang,Guizhou550002, China;3.Chengdu Centre, China Geological Survey, Chengdu，Sichuan 610081, China；
    4.Shaanxi Centre of Geological Survey, Xi’an, Shaanxi 710068，China)
  • Online:2015-06-10 Published:2015-07-08

PDF (PC)

938

被引次数

5

摘要：

吉松铅锌矿床位于喜马拉雅造山带东部，矿体由石英-方解石-硫化物脉组成，主要受北东向断裂构造控制。矿石矿物组合为闪锌矿、方铅矿和少量磁黄铁矿、黄铜矿；脉石矿物包括石英、方解石、毒砂和黄铁矿等。矿床可划分为：Ⅰ.毒砂-黄铁矿-石英阶段；Ⅱ.磁黄铁矿-闪锌矿-方铅矿-黄铜矿-石英阶段；Ⅲ.石英-方解石-黄铁矿阶段；Ⅳ.表生氧化阶段。石英、方解石中包裹体以气液两相水包裹体为主，含少量CO2包裹体和纯液相水包裹体。成矿流体特征为中低温度、低盐度、低密度，显微测温结果显示：Ⅰ 阶段的均一温度范围225~345 ℃，盐度为0.21%~11.93% NaCl eqv；Ⅱ 阶段的均一温度范围145~339 ℃，盐度为0.35%~13.26% NaCl eqv；Ⅲ 阶段的均一温度范围210~350 ℃，盐度为0.35%~15.31% NaCl eqv。流体包裹体特征表明成矿流体发生了沸腾作用，可能是矿质沉淀的主要原因。分析表明该矿床为中低温热液脉型铅锌矿床。

关键词: 成矿作用, 流体包裹体, 吉松铅锌矿床, 藏南

Abstract:

The Jisong Pb-Zn deposit is located at the east of Himalaya orogenic belt. The ore-bodies are quartz-calcite-sulfide veins and mainly controlled by NE faults. The ore mineral assemblage is sphalerite,galena, and a little pyrrhotite, chalcopyrite. The gangue minerals include quartz, calcite, arsenopyrite and pyrite. It can be divided into four stages: Ⅰ.arsenopyrite-pyrite-quartz stage; Ⅱ.pyrrhotite-sphalerite-galena-chalcopyrite-quartz stage; Ⅲ.quartz-calcite-pyrite stage;Ⅳ.supergene oxidation stage. Fluid inclusions in quartz and calcite are dominant in vapor-liquid two-phase inclusion, and also include a small amount of CO2-H2O inclusions with a few pure liquid ones.The ore-forming fluid is characterized by medium-low temperature, low salinity and low density that homogenization temperature ranges between 225 ℃and 345 ℃ and the salinity varies from 0.21% to 11.93% NaCl eqv in the stage Ⅰ,145-339 ℃ and 0.35% to 13.26% NaCl eqv in the stage Ⅱ,210-350 ℃ and 0.35% to 15.31% NaCl eqv in the stage Ⅲ, respectively. All characteristics of fluid inclusions indicate that fluid-boiling during the mineralization stage may be the major cause of ore material precipitation. Analysis supports that Jisong deposit is a medium-low temperature hydrothermal vein-type Pb-Zn deposit.

Key words: mineralization, fluid inclusion, Jisong Pb-Zn deposit, south Tibet

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