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现代地质 ›› 2011, Vol. 25 ›› Issue (4): 720-729.

• 矿床学与遥感找矿 • 上一篇    下一篇

新疆乌恰县萨热克铜矿床地质特征及硫、铅同位素地球化学

李志丹1,2,薛春纪2,辛江2,3,王思程4,贾志业2,石海岗2,董新丰2,邵行来2,5   

  1. 1中国地质调查局 天津地质调查中心,天津300170;2地质过程与矿产资源国家重点实验室,中国地质大学 地球科学与资源学院,
    北京100083;3新疆鑫汇矿业有限责任公司,新疆 乌鲁木齐830000;4北京大学 造山带与地壳演化教育部重点实验室,
    北京100871;5新疆维吾尔自治区人民政府 国家305项目办公室,新疆 乌鲁木齐830000
  • 收稿日期:2010-11-05 修回日期:2011-06-01 出版日期:2011-08-29 发布日期:2011-08-31
  • 通讯作者: 薛春纪,男,教授,博士生导师,1962年出生,矿物学、岩石学、矿床学专业,从事矿床学、矿产普查与勘探专业的教学与研究工作。Email:chunji_xue@cugb.edu.cn。
  • 作者简介:李志丹,男,硕士,1986年出生,矿物学、岩石学、矿床学专业,主要从事矿床学、矿产普查与勘探研究。Email:cugcug@qq.com。
  • 基金资助:

    国家科技支撑计划项目(2007BAB25B05,2006BAB07B01);高等学校学科创新引智计划项目(B07011); 长江学者和创新团队发展计划项目(IRT0755);中国地质调查局项目(G10015)。

Geological Characteristics and S, Pbisotope Geochemistry of Sareke Copper Deposit in Wuqia County, Xinjiang

XinjiangLI Zhidan1,2, XUE Chunji2, XIN Jiang2,3, WANG Sicheng4, JIA Zhiye2, SHI Haigang2,
DONG Xinfeng2, SHAO Xinglai2,5
  

  1. 1Tianjin Center of Geological Survey, China Geological Survey, Tianjin300170, China; 2State Key Laboratory of Geological Processes and
    Mineral Resources,School of Earth Sciences and Resources, China University of Geosciences, Beijing100083, China; 3Xinjiang Xinhui Mineral
    Corporation,Urumqi, Xinjiang830000, China; 4Key Laboratory of Orogenic Belts and Crustal Evolution of Ministry of Education,
    Peking University, Beijing100871, China; 5The National 305 Project Office of Xinjiang, Urumqi, Xinjiang830000, China
  • Received:2010-11-05 Revised:2011-06-01 Online:2011-08-29 Published:2011-08-31

摘要:

萨热克铜矿是塔里木盆地西北缘中新生界沉积盆地内的大型矿床。矿床定位于托云中生代拉分盆地西缘与东阿赖海西晚期深海盆之间的萨热克巴依中生代断陷盆地内,矿体呈层状、透镜状分布于上侏罗统库孜贡苏组上段(J3k2)灰绿色砾岩层位中,矿石矿物主要为辉铜矿、孔雀石,围岩蚀变较弱。矿石中辉铜矿δ34S=-240‰~-190‰,指示硫来自地层中大量硫酸盐的生物还原作用,辉铜矿206Pb/204Pb比值范围为18475~18642,207Pb/204Pb为15606~15676,208Pb/204Pb为38585~38795,指示成矿金属来自于上地壳和造山带剥蚀区。结合矿床地质及地球化学研究,判断萨热克铜矿是与盆地流体活动相关的砾岩型铜矿。

关键词: 铜矿床, 矿床地质特征, 硫、铅同位素, 萨热克铜矿, 新疆乌恰县

Abstract:

Sareke copper deposit in MesoCenozoic sedimentary basins of northwestern margin of Tarim Basin is a largescale deposit. The tectonic location of the deposit is located in the Sarekebayi Mesozoic fault basin, which is seated between the western margin of Tuoyun MesoCenozoic pullapart basin and Late Hercynian deep ocean basin in east Alai. The orebodies, with the layered and lenslike shape, occurred in the gray green conglomerate belonging to the second lithologic section of Upper Jurassic Kuzigongsu Formation. The main metallic minerals are chalcocite and malachite with weak country rock alteration. δ34S of chalcocite is in the range of -240‰~-190‰,indicating that the sulfur are mainly derived from biological reduction of the strata sulfate. The ratio of 206Pb/204Pb, 207Pb/204Pb, and 208Pb/204Pb are 18475~18642, 15606~15676, and 38585~38795,respectively, which illustrate that the oreforming matters are mainly from upper crust and orogenic erosion zone. Geological characteristics and geochemistry of the copper deposit lead to the conclusion that Sareke copper deposit is a basin fluidrelated conglomerate type deposit.

Key words: copper deposit, geological characteristics, sulfur and lead isotope, Sareke copper deposit, Wuqia County, Xinjiang

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