青海双朋西金铜矿床的成矿流体特征及流体来源

doi:10.11867/j.issn.1001-8166.2009.05.0531

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

傅晓明 ¹,戴塔根 ¹,息朝庄 ¹;,刘伟 ²,刘旭 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.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

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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SO₄^2-、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。

关键词: 成矿流体, 包裹体, 双朋西, 青海

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⁺,SO₄^2-,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.


Key words: Ore-forming fluid, Inclusion, Shuangpengxi, Qinghai.

中图分类号:

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