新疆乌伦布拉克铜矿流体包裹体特征及含矿岩体年代学
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  • 英文篇名:Fluid Inclusions and Geochronology of Wulunbulake Copper Deposit in Xinjiang
  • 作者:孙万龙 ; 彭素霞 ; 白建科 ; 刘建朝 ; 王德明 ; 邵博琪 ; 李天石
  • 英文作者:Sun Wanlong;Peng Suxia;Bai Jianke;Liu Jianchao;Wang Deming;Shao Boqi;Li Tianshi;School of Earth Science and Resources,Chang'an University;Xi'an Center of Geological Survey,China Geological Survey;Regional Geological Survey Brigade No.2,Xinjiang Bureau of Geology and Mineral Resources;School of Earth Sciences and Resources,China University of Geosciences;
  • 关键词:流体包裹体 ; 锆石U-Pb定年 ; 斑岩型铜矿 ; 东准噶尔 ; 地质年代学
  • 英文关键词:fluid inclusion;;zircon U-Pb dating;;porphyry copper deposit;;East Junggar;;geochronology
  • 中文刊名:DQKX
  • 英文刊名:Earth Science
  • 机构:长安大学地球科学与资源学院;中国地质调查局西安地质调查中心;新疆地矿局第二区域地质调查大队;中国地质大学地球科学与资源学院;
  • 出版日期:2018-06-20 17:34
  • 出版单位:地球科学
  • 年:2018
  • 期:v.43
  • 基金:陕西省自然科学基金项目(No.2018JM4001);; 中国地质调查局地质矿产调查评价项目(No.DD20160006)
  • 语种:中文;
  • 页:DQKX201812016
  • 页数:15
  • CN:12
  • ISSN:42-1874/P
  • 分类号:211-225
摘要
乌伦布拉克铜矿位于新疆东准噶尔野马泉-琼河坝铜多金属成矿带中,其矿床成因和成矿时代存在较大争议,从流体包裹体和锆石U-Pb定年等方面做了研究探讨.矿床主要发育富液相包裹体,成矿流体为低温(136.9~224.5℃)、低盐度(1.7%~5.6%NaCl eqv.)、低密度(0.97~1.01g/cm~3)流体,估算的成矿压力为2.76×107~4.49×107 Pa,对应的成矿深度为1.04~1.95km,属于浅成矿床.激光拉曼探针测试结果表明流体液相组分主要为水,气相组分除水蒸气外,还含有一定量CH_4、N_2和H_2.锆石U-Pb测年结果显示含矿石英闪长岩年龄为440.5±3.3Ma,不含矿石英斑岩年龄为419.7±3.3Ma,表明研究区至少经历了2期岩浆活动,成矿作用从早志留世就已开始.矿床由内向外发育典型的"斑岩型"蚀变分带(强硅化带-钾化带-绢英岩化带-青磐岩化带),表明乌伦布拉克铜矿为斑岩型铜矿,形成于志留纪古亚洲洋向南俯冲的岛弧环境.东准噶尔甚至新疆北部地区在志留纪处于岛弧环境,该时期的岩浆岩带是形成和寻找斑岩型铜矿的有利地区.
        Wulunbulake copper deposit is located at the north-western segment of the Yemaquan-Qiongheba Cu-polymetallic metallogenic belt,East Junggar,Xinjiang.However,its genetic type and mineralizing age has been debated.This study presents new results on fluid inclusions and zircon U-Pb dating to precisely constrain the type and time of mineralization.The dominant fluid inclusions in Wulunbulake copper deposit are liquid-rich type,with low homogenization temperature(136.9-224.5℃),low salinity(1.7%~5.6% NaCl eqv.)and low density(0.97-1.01 g/cm~3),the mineralizing pressure is 2.76×107-4.49×107 Pa and the corresponding depth is 1.04-1.95 km.The laser Raman spectroscopy results indicate that the oreforming fluids consist of H_2 O,CH_4,N_2,H_2.Zircon U-Pb dating results show that the formation age of ore-bearing quartz diorite and quartz porphyry is 440.5±3.3 Ma,and 419.7±3.3 Ma,respectively,indicating that there had experienced two-stage magmatic activities from Early Silurian.From the interior to the outer part of the deposit,there exist typical alteration zonation characteristics of porphyry deposits(silica alternation-potassic alternation-phyllic alternation-propylitization),and the geochem-ical characteristics of ore-bearing indicate that they were most possibly formed in arc setting.Its genetic type should be typical porphyry copper deposit and related to the southward subduction of the Paleo-Asian oceanic crust in the Early Silurian period.The East Junggar even northern Xinjiang was in the island arc environment in the Silurian,and the magmatic zone is a potential area for formation and prospecting of porphyritic Cu deposit.
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