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现代地质 ›› 2009, Vol. 23 ›› Issue (2): 277-284.

• 矿床学 • 上一篇    下一篇

河南省老湾金矿床地球化学特征及矿床成因

陈良1，戴立军2，王铁军2，罗平1，夏国体3   

  1. 1中国地质大学 地球科学与资源学院，北京100083；2中钢集团 天津地质研究院，天津300061； 3中国冶金地质总局 昆明地质勘查院，云南 昆明650203
  • 收稿日期:2008-09-18 修回日期:2009-02-18 出版日期:2009-04-20 发布日期:2011-12-21
  • 作者简介:陈良，男，博士研究生，1981年出生，矿物学、岩石学、矿床学专业，主要从事矿床学研究。 Email:chenliang-2005@tom.com。
  • 基金资助:

    国家自然科学基金重点项目(40434011)

Geochemical Characteristics and Genesis of the Laowan Gold Deposit in Henan Province

CHEN Liang 1，DAI Li-jun 2，WANG Tie-jun 2，LUO Ping 1，XIA Guo-ti 3   

  1. 1School of Earth Sciences and Resources，China University of Geosciences，Beijing100083， China；
    2Tianjin Geological Academy，Sinosteel Corporation，Tianjin300061， China;
    3Kunming Geological Exploration Institute，China Metallurgical Geology Bureau，Kunming,Yunnan650203，China
  • Received:2008-09-18 Revised:2009-02-18 Online:2009-04-20 Published:2011-12-21

PDF (PC)

3747

被引次数

13

摘要：

        在详细分析河南省老湾金矿床成矿地质背景、矿床地质特征的基础上，研究该矿床流体包裹体和氢、氧、硫、铅同位素，结果表明该金矿床的成矿流体为中低温、低盐度的富CO2的K+-Na+ -Cl--SO 2-4体系。氧、氢同位素分析显示，成矿流体δ18O值变化于-5.25‰～+5.37‰，δD变化于-67‰～-76‰，表明成矿流体主要来源于岩浆水和大气降水；硫化物的δ34S值变化于-0.1‰～+5.3‰，平均值为+3.98‰，显示深源硫的特征；Pb同位素组成显示铅主要来源于地幔，有少量地壳铅的加入。综合研究表明，老湾金矿床为受韧性剪切带控制的中—低温热液构造蚀变岩型金矿床。

关键词: 地球化学, 流体包裹体, 成矿流体, 矿床成因, 老湾金矿, 河南

Abstract:

          On the basis of detailed investigation of geological setting and ore deposit geologic features, this study analyses quartz-hosted fluid inclusions and oxygen and hydrogen isotope composition of quartz, as well as sulfur and lead isotope composition of sulfides from the Laowan gold deposit in Henan Province. The ore-forming fluid of the Laowan gold deposit is of the CO2 -rich K+-Na+-Cl--SO2-4 system with middle-low temperature and low salinity. Oxygen and hydrogen isotope analyses show that  δ18O and δD values range from -5.25‰ to +5.37‰ and-67‰ to -76‰, respectively, which indicates that the ore-forming fluid of the Laowan gold deposit is derived from magmatic and meteoric water. The δ34S values of sulfides associated with gold mineralization range from -0.1‰ to+5.3‰ with a mean of +3.98‰, indicating typical signature of deep source sulfur. The characteristics of lead isotope indicate that it was mainly derived from the mantle, partly from the crust. Comprehensive research shows that Laowan gold deposit is a mesothermal-epithermal tectonic altered type gold deposit controlled by ductile shear zone.

Key words: geochemistry, fluid inclusion, ore-forming fluid, genesis of ore deposit, Laowan gold deposit, Henan

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