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金属矿山 ›› 2015, Vol. 44 ›› Issue (09): 100-104.

• 地质与测量 • 上一篇    下一篇

尕尔穷—嘎拉勒铜金矿集区S、Pb同位素地球化学特征

白云1,2,张志1,陈毓川3,唐菊兴3,何林4,杨毅1   

  1. 1.成都理工大学地球科学学院,四川 成都 610059;2.四川省冶金地质勘查局六〇五大队,四川 眉山 620860;3.中国地质科学院矿产资源研究所,北京 100037;4.西藏自治区地质矿产勘查开发局第二地质大队,西藏 拉萨 850000
  • 出版日期:2015-09-15 发布日期:2015-11-20
  • 基金资助:

    基金项目 国土资源部公益性行业科研专项(编号:201011013-3),国家自然科学基金项目(编号:41172077),国家重点基础研究发展计划(973计划)项目(编号:2011CB403103)。

S,Pb Isotope Geochemical Characteristics of the Gaerqiong-Galale Gold-Copper Ore-concentrated Area

Bai Yun1,2,Zhang Zhi1,Chen Yuchuan3,Tang Juxing3,He Lin4,Yang Yi1   

  1. 1.College of Earth Science,Chengdu University of Technology,Chengdu 610059,China;2.The 605 Brigade of Geological Exploration and Resources Development,Meishan 620860,China;3.Institute of Mineral Resources,Chinese Academy of Geological Sciences, Beijing 100037,China; 4.No.2 Geological Party,Tibet Bureau of Geology and Mineral Resources Exploration,Lhasa 850000,China
  • Online:2015-09-15 Published:2015-11-20

摘要: 以西藏尕尔穷—嘠拉勒铜金矿集区为研究对象,通过分析矿石硫化物S、Pb同位素组成特征,探讨了矿床物质来源,结果表明:①矿石金属硫化物δ34S值为-4.4‰~6.2‰,平均为0.13‰,主要集中于-2‰~1.5‰,具塔式分布特征,总体体现出地幔岩浆硫特点,但已受到少数地壳硫的混染;②矿石Pb同位素组成范围较大,体现出混源铅特征,其μ值特征及构造环境判别图显示区内铅起源于幔源,主要为地幔与上地壳混合的造山带铅;③与多龙矿集区多不杂与拿若矿床对比研究发现,两矿集区硫源均为岩浆硫,处于俯冲背景下的多龙矿集区成矿物质来源相对较深,而处于碰撞环境中的尕尔穷—嘎拉勒成矿物质来源相对较浅。上述分析成果对于区内找矿工作具有一定的参考价值。

关键词: S同位素, Pb同位素, 地球化学特征, 壳幔混源, 成矿物质来源

Abstract: Taking the Gaerqiong-Glalae Cu-Au ore-concentrated area as the research object,the S and Pb isotope compositions characteristics of sulfide ore and the metallogenic material sources are analyzed.The results show that:①the δ34S value of the ore metal sulfides vary from -4.4‰ to 6.2‰,with the average δ34S value of 0.13‰,mainly between -2 ‰ and 1.5 ‰,and with the characteristics of tower distribution,it overall reflects the characteristics of mantle magma sulfur,but has been contaminated by a few of crustal sulfur;②the composition range of Pb isotope of the ore is large,showing the characteristics of mixed source of lead,the characteristics of μ value and tectonic environment discrimination diagram indicate that lead of the research region is originated in the mantle source region,mainly the upper crust and mantle mixed orogenic belt lead;③comparing with the Buza and Naruo deposit in Duolong ore-concentrated area and the Gaerqiong-Glalae Cu-Au ore-concentrated area,it is considered that the source of sulfur of the above ore-concentrated areas are both magmatic sulfur,and the ore-forming materials of Duolong ore-concentrated area is relatively deep with the environment of subduction,and the ore-forming materials of Gaerqiong-Galale ore-concentrated area is relatively shallow with the environment of collision.The above analysis results have a certain reference for the prospecting work in the research area.

Key words: S isotope, Pb isotope, Geochemical characteristics, Crust mantle mixed sources, Sources of ore-forming materials