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铜同位素在矿床学中的应用:认识与进展

王跃|朱祥坤   

  1. 中国地质科学院 地质研究所/国土资源部同位素地质重点实验室|北京 100037
  • 收稿日期:2010-05-30 出版日期:2010-07-26 发布日期:2010-07-26
  • 通讯作者: 朱祥坤(1961-),男,山东沂水人,研究员,博士生导师,主要从事同位素地球化学研究 E-mail:xiangkun@cags.net.cn
  • 作者简介:王跃(1984-)|女|吉林珲春人|博士研究生|主要从事同位素地球化学研究|E-mail:wyivy@yahoo.com.cn
  • 基金资助:

    国家自然科学基金项目(40973037,40921001);国家重点基础研究发展规划项目(2007CB411408)

Applications of Cu Isotopes on Studies of Mineral Deposits: A Status Report

WANG Yue|ZHU Xiang-kun   

  1.  Institute of Geology/Laboratory of Isotope Geology, MLR, CAGS,Beijing 100037
  • Received:2010-05-30 Online:2010-07-26 Published:2010-07-26

摘要:

在甘肃西峰剖面黄土样品的铜同位素组成测定基础上,讨论了地壳的平均铜同位素组成。根据铜同位素在不同储库、不同类型矿床和不同矿物中的分布特征,认为铜同位素可以用来指示成矿温度、源区变化、流体出溶过程、矿化过程和次生富集过程等与成矿作用相关的信息。具体表现在:低温环境下形成的矿物比高温环境下形成的矿物具有更大的铜同位素组成变化范围;流体出溶过程中,铜同位素会发生分馏,早期出溶的流体富集铜的轻同位素,晚期出溶的流体富集铜的重同位素;同一矿化集中区内,根据同类型矿床间的铜同位素分布特征可以判别出其是否为同一矿化事件的产物;热液萃取源区铜的过程中,铜的重同位素优先从源区中淋滤出来。此外,在成矿体系中,淋滤帽富集轻同位素的特征可能暗示其下部存在铜矿化富集带。

关键词: 西峰黄土, 铜同位素, 成矿温度, 流体出溶, 源区变化

Abstract:

Based on Cu isotope compositions of loess from Xifeng loess section, Gansu Province, average value of δ65 Cu in crust is determined. According to distribution of Cu isotope in various sources, types of ore deposit as well as copper-bearing minerals, authors suggest the composition Cu isotope be used to trace ore-forming temperature, fluid exsolution, mineralization process and deep mineralization. Values of  δ65 Cu in low-temperature deposits vary more largely than those in high-temperature deposits. Cu isotopes fractionated during the fluid exsolution and the light Cu isotope is preferentially enriched in the early exsoluted fluid while heavy Cu isotope enriched in later exsoluted fluid. In a metallogenic province, different deposits with the same genesis have the similar composition of Cu isotope, which can be used to distinguish whether they are product of a same mineralization event. When ore-forming materials including Cu leached from the region, the heavy Cu isotopes are preferentially leached than the light Cu isotope. In addition, in an oreforming system, light Cu isotope enrichment of leaching cap may reflect strong leaching occurred, and then indicates the Cu mineralized enrichment zone occur in deep.

Key words: Xifeng loess, Cu isotopes, temperature of metallogenesis, fluid exsolution, source variations

中图分类号: 

  • P611
[1] 周朝宪,张云国,唐萍芝,陈焰苗,王双伦,祁亚辉,杨强. 东升庙矿床成因和找矿研究--与张志斌等商榷[J]. 吉林大学学报(地球科学版), 2012, 42(6): 1656-1664.
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