江西龙头岗铜锌矿床成矿流体研究

南京大学学报(自然科学版) ›› 2018, Vol. 54 ›› Issue (2): 308–.

江西龙头岗铜锌矿床成矿流体研究

魏　滔，倪　培*，范明森，张　鑫，刘　政

出版日期:2018-03-30 发布日期:2018-03-30
作者简介:内生金属矿床成矿机制研究国家重点实验室，南京大学地球科学与工程学院，南京，210023
基金资助:
基金项目：国家重点研发计划(2016YFC0600205)
收稿日期：2018－01－09
*通讯联系人，E－mail：peini@nju.edu.cn

Study on ore－forming fluids of the Longtougang Cu－Zn deposit，Jiangxi province

Wei Tao，Ni Pei*，Fan Mingsen，Zhang Xin，Liu Zheng

Online:2018-03-30 Published:2018-03-30
About author: State Key Laboratory for Mineral Deposit Research，School of Earth Science and Engineering，Nanjing University，Nanjing，210023，China

摘要/Abstract

摘要： 江西龙头岗铜锌矿床成矿过程可分为：干矽卡岩、湿矽卡岩、硫化物－石英和石英－碳酸盐阶段，铜锌矿化主要发生在硫化物－石英阶段. 对不同成矿阶段的钙铁辉石和石英所进行的流体包裹体研究表明，干矽卡岩和石英－碳酸盐阶段主要发育富液相两相包裹体(Ⅰ类)，硫化物－石英阶段除Ⅰ类包裹体外，还发育有富气相两相(Ⅱ类)和含子晶三相包裹体(Ⅲ类). 干矽卡岩阶段Ⅰ类包裹体均一温度为345 ℃～418 ℃，盐度为3.2 wt.%～8.7 wt.% NaCl equiv.；在硫化物－石英阶段，流体曾发生沸腾，由Ⅱ类包裹体和Ⅲ类包裹体构成的沸腾包裹体组合均一温度分别为295 ℃～391 ℃与267 ℃～360 ℃，盐度分别为0.7 wt.%～3.4 wt.% NaCl equiv.和31.6 wt.%～38.9 wt.% NaCl equiv.；石英－碳酸盐阶段Ⅰ类包裹体均一温度为234 ℃～274 ℃，盐度为0.2 wt.%～2.2 wt.% NaCl equiv.. 激光拉曼光谱分析表明：三类包裹体的气相组成均以H2O为主，其次还含有少量的CO2和CO. 认为构造减压可能是导致流体沸腾的重要原因，成矿物质沉淀也与流体沸腾关系密切．

Abstract: The Longtougang Cu－Zn deposit is located in the Northern Wuyi terrane. Orebodies are primarily hosted in glutenite of the Outangdi formation，the minority hosted in biotite－plagioclase granulite of the Zhoutanyan formation. The mineralization process can be divided into four stages：anhydrous skarn stage，hydrous skarn stage，sulfide－quartz stage and quartz－carbonate stage，Cu－Zn mineralization mainly occurs in the sulfide－quartz stage. Petrographic and microthermometric studies of fluid inclusions in hedenbergite and quartz of different mineralization stages show that there exist three types of fluid inclusions in the Longtougang deposit，namely two－phase liquid－rich(type Ⅰ)，two－phase gas－rich(type Ⅱ)and halite－bearing aqueous inclusions(type Ⅲ)，all of them can be recognized in the sufide stage while only typeⅠ inclusions developed in the anhydrous and quartz－carbonate stage. In order to discuss the evolution of the ore－forming fluids，the homogenization temperature(Th)and salinity of the three types of fluid inclusions have been measured by Linkam THMS600 and calculated formula，respectively. TypeⅠ inclusions in the anhydrous stage display Th of 345 ℃～418 ℃，and salinities of 3.2 wt.%～8.7 wt.% NaCl equivalent；fluid boiling occurred in the sulfide－quartz stage，which resulted in type Ⅱ and type Ⅲ inclusions share similar homogenization temperatures of 295 ℃～391 ℃ and 267 ℃～360 ℃，and contrasted salinities of 0.7 wt.%～3.4 wt.% and 31.6 wt.%～38.9 wt.% NaCl equivalent，respectively；type Ⅰ inclusions in the quartz－carbonate stage display Th of 234 ℃～274 ℃，and salinities of 0.2 wt.%～2.2 wt.% NaCl equivalent. Considering that the filed observation and various types of fluid inclusions，tectonic depression may be a vital factor for fluid boiling，which may also contribute to the late－stage sulfide deposition.

魏　滔，倪　培*，范明森，张　鑫，刘　政. 江西龙头岗铜锌矿床成矿流体研究[J]. 南京大学学报(自然科学版), 2018, 54(2): 308–.

Wei Tao，Ni Pei*，Fan Mingsen，Zhang Xin，Liu Zheng. Study on ore－forming fluids of the Longtougang Cu－Zn deposit，Jiangxi province[J]. Journal of Nanjing University(Natural Sciences), 2018, 54(2): 308–.

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