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现代地质 ›› 2011, Vol. 25 ›› Issue (5): 869-876.

• 矿床学与岩石学 • 上一篇    下一篇

西藏墨竹工卡县洞中拉铅锌矿床S、Pb同位素组成及成矿物质来源

刘婷婷1,唐菊兴1,2,刘鸿飞3,张金树3,崔晓亮1,3,高一鸣2   

  1. 1成都理工大学 地球科学学院,四川 成都610059; 2中国地质科学院 矿产资源研究所,北京100037;
    3西藏自治区地质矿产勘查开发局,西藏 拉萨851400
  • 收稿日期:2011-04-30 修回日期:2011-07-25 出版日期:2011-10-26 发布日期:2011-11-03
  • 通讯作者: 崔晓亮,男,博士研究生,1982年出生,矿物学、岩石学、矿床学专业,主要从事矿床学研究。 Email:911cxl@163.com。
  • 作者简介:刘婷婷,女,博士研究生,1982年出生,第四纪地质专业,主要从事第四纪地质学研究。Email:5578316@qq.com。
  • 基金资助:

    中国地质调查局项目“念青唐古拉地区成矿条件研究与找矿靶区优选”(1212010818089);国家科技支撑项目“中西部大型矿产基地综合勘查技术与示范”(2006BAB01A01)。

Sulfur and Lead Isotope Composition and Tracing for Sources of Oreforming Materials in the Dongzhongla PbZn Deposits in Mozhugongka County,Tibet

 LIU  Ting-Ting-1, TANG  Ju-Xin-1, 2 , LIU  Hong-Fei-3, ZHANG  Jin-Shu-3, CUI  Xiao-Liang-1, 3 , GAO  Yi-Ming-2   

  1. 1College of Earth Sciences,Chengdu University of Technology,Chengdu,Sichuan610059,China;
    2Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing100037,China;
    3Tibet Bureau of Geoexploration and Mineral Development, Lhasa, Tibet851400,China
  • Received:2011-04-30 Revised:2011-07-25 Online:2011-10-26 Published:2011-11-03

摘要:

为了探讨西藏墨竹工卡县洞中拉铅锌矿的成矿物质来源,研究矿床成矿机制,对该矿床的矿石样品进行了硫和铅同位素分析,并对其变化规律和成因意义进行讨论。研究结果表明,6件金属硫化物样品(闪锌矿、黄铜矿、方铅矿)的δ34S值变化于2.2‰~4.8‰之间,显示硫同位素组成比较稳定。根据共生硫化物对所确定的温度,该矿床属中低温热液矿床。6件金属硫化物样品206Pb/204Pb、207Pb/204Pb和208Pb/204Pb变化范围分别为18.628 0~18.629 6、15.698 0~15.699 9、39.077 5~39.082 4,平均值分别为18.628 70、15.699 02和39.079 37。硫和铅同位素研究结果表明,洞中拉铅锌矿床的硫主要来自沉积围岩,主要为无机还原成因,有少量硫来自本地区燕山晚期花岗岩;洞中拉铅锌矿床矿石铅主要来自上地壳物质。

关键词:  , S、Pb同位素, 成矿物质来源, 洞中拉铅锌矿床, 热液矿床, &delta, 34S值, 上地壳物质

Abstract:

In order to discuss the oreforming material sources of the Dongzhongla PbZn deposits and study the metallogenic mechanism,we analyzed the sulfur and lead isotope from the orebody,discussed the changing regularity and significance.  The results show that the δ34S values of the six metal sulfides vary from 2.2‰ to 4.8‰, and that the sulfur isotope composition is stable.  The temperatures calculated from sulfideparas show that the deposits are the middlelow temperature deposits.  The 206Pb/204Pb,207Pb/204Pb and 208Pb/204Pb ratios of 6 sulfide samples of orebody vary in ranges of 18.628 0-18.629 6,15.698-15.699 9,39.0775-39.082 4,with the average values of 18.628 7,15.699 02 and 39.079 37, respectively.  The results of sulfur and lead isotope show that the oreforming materials of Dongzhongla PbZn deposits came from the Permian volcanic sedimentary rock and late Yanshan period granite.

Key words: sulfur and lead isotope;oreforming material source;Dongzhongla leadzinc deposits;hydrothermal deposit;&delta, 34S value;upper crust material