地球科学进展 ›› 2009, Vol. 24 ›› Issue (5): 531 -537. doi: 10.11867/j.issn.1001-8166.2009.05.0531

研究论文 上一篇    下一篇

青海双朋西金铜矿床的成矿流体特征及流体来源
傅晓明 1,戴塔根 1,息朝庄 1;,刘  伟 2,刘  旭 1   
  1. 1.中南大学地学与环境工程学院,湖南  长沙  410083; 2.湖南有色金属控股集团有限公司,湖南  长沙  410015
  • 收稿日期:2008-12-29 修回日期:2009-04-07 出版日期:2009-05-10
  • 通讯作者: 傅晓明 E-mail:xczcsummmmmm@126.com
  • 基金资助:

    国家重点基础研究发展计划项目“藏东缘大型复合盆地铜铅锌银多金属成矿作用”(编号:2002CG412607);国家科技攻关项目“大型铜矿山接替资源探查技术与示范”(编号:2004BA615-02)资助.

Characteristics of Ore-Forming Fluid and Genesis of the Shuangpengxi Gold-Copper Deposit in Qinghai Province

Fu Xiaoming 1,Dai Tagen 1,Xi Chaozhuang 1,Liu Wei 2,Liu Xu 1   

  1. 1.School of Geosciences and Environmental Engineering,Central South University, Changsha  410083,China;
    2.Hunan Non-Ferrous Metals Holding Group Company, Ltd, Changsha  410015,China
  • Received:2008-12-29 Revised:2009-04-07 Online:2009-05-10 Published:2009-05-10

      通过对双朋西金铜矿床流体包裹体岩相学、测温学及铅、硫同位素等的分析,研究其成矿流体性质和演化,并探讨矿床成矿流体来源,结果表明:①流体包裹体主要为气液两相包裹体;包裹体液相成分阳离子以Na+、K+、Ca2+为主,阴离子主要以SO42-、Cl-为主;气相以H2O、CO2为主。②双朋西金铜矿床成矿流体为中高温、中等盐度、中等密度、中等压力的流体。③铅同位素206Pb/204Pb为18.058~18.710,207Pb/204Pb为15.581~15.641,208Pb/204Pb为38.191~38.531;δ34S值(‰)变化范围为+3.1~+6.2,平均值为+4.42;综合分析认为,本区铅、硫同位素来源应为壳幔混合源。

      Based on the study of the fluid inclusion, thermometry and isotopes analyses, the characteristics of oreforming fluid, fluid evolution and the origin of the Shuangpengxi gold-copper deposit were discussed and systematically studied. The results showed that: ①These inclusions consisted of mainly 2 phases of gas and liquid. Analysis showed that the compositions of liquid and gas in the inclusions were Na+,K+,Ca2+,SO42-,Cl-,H2O,CO2.②The homogenization temperature, salinity and density and pressure of fluid inclusions for the mineralization, ranged from 210℃ to 460℃,and 3.0% to 6.5%,and 0.600 to 0.800(g/cm3),and 8.0 to 20.0 MPa,respectively being middle-high temperature, middle salinity, middle density and middle pressure fluid.③Pb isotope 206Pb/204Pb range from 18.058 to 18.710,207Pb/204Pb range from 15.581 to 15.641, 208Pb/204Pb range from 38.191 to 38.531, δ34S value(‰) range from +3.1 to +6.2(average +4.42),indicating that the source of Pb and S from crust mantle mixed origin.
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中图分类号: 

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