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现代地质 ›› 2010, Vol. 24 ›› Issue (1): 52-58.

• 矿床学 • 上一篇    下一篇

西藏蒙亚啊铅锌矿床S、Pb同位素组成及对成矿物质来源的示踪

  

  1. 1.中国地质大学 地质过程与矿产资源国家重点实验室,北京100083;2.中国地质科学院 矿产资源研究所,北京 100037;3.成都理工大学 地球科学学院,四川 成都610059
  • 出版日期:2010-02-20 发布日期:2010-03-29
  • 作者简介:王立强,男,硕士研究生,1984年出生,矿产普查与勘探专业,主要从事矿床学和矿床地球化学研究。Email:wangliqiang198406@tom.com
  • 基金资助:

    国家科技支撑项目(2006BAB01A01);中国地质调查局青藏高原专项(1212010818089)。

Sulfur and Lead Isotope Composition and Tracing for the Sources of Ore-Forming Materials in the Mengya'a Pb-Zn Deposit,Tibet

  1. 1.State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China;  2.Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing100037, China;  3.College of Earth Sciences, Chengdu University of Technology,Chengdu,Sichuan610059, China
  • Online:2010-02-20 Published:2010-03-29

摘要:

西藏蒙亚啊铅锌矿床位于冈底斯成矿带东段,矿体主要赋存于上石炭统—下二叠统来姑组碳酸盐岩内的矽卡岩和矽卡岩化大理岩中,近东西向似层状产出。在分析该矿床成矿地质条件的基础上,系统地研究了矿石硫、铅同位素组成特征,探讨了成矿物质来源。研究表明,矿石硫化物的硫同位素组成变化范围较窄,具塔式分布效应,估算得到成矿热液系统的总硫同位素值δ34S∑S 约为5.2‰,具有岩浆硫的特征;矿石铅同位素组成稳定,为正常普通铅,矿石铅来源于早白垩世上地壳物质部分熔融形成的岩浆。

关键词: 同位素组成, 成矿物质来源, 冈底斯成矿带, 蒙亚啊铅锌矿床, 西藏

Abstract:

The Mengyaa leadzinc deposit in Tibet is located in the eastern section of Gangdise metallogenic belt. The ore body mainly occurs as stratoid form in the skarn and skarnization marble of the Middle CarboniferousUpper Permian Laigu Formation, distributed nearly EW direction. Based on analysis of the oreforming geological conditions, this paper studies systematically the composition characteristics of S, Pb isotopes in the ore and discusses the sources of the oreforming materials. Studies have shown that the composition of S isotope in ore sulfides has a narrow variation range and a tower distributional effects. The δ34S∑S of the oreforming hydrothermal system is about 5.2‰, which presents a characteristic of sulfur from magmatic origin. The Pb isotopic composition of ore sulfides is stable and the ore lead is ordinary common lead. Ore lead derived from magma, which came from partial melting of the upper crust in Early Cretaceous. 

Key words: isotopic composition, sources of ore-forming material, Gangdise metallogenic belt, Mengya'a Pb-Zn deposit, Tibet

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