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西天山卡特巴阿苏金铜矿区中性侵入岩地球化学特征及地质意义
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  • 英文篇名:Geochemical Characteristics and Geological Significance of Neutral Intrusive Rocks in Kateba'asu Au-Cu Deposit,Western Tianshan
  • 作者:李晓光 ; 弓小平 ; 邢令 ; 刘洋洋 ; 韩秉峻 ; 李秉政
  • 英文作者:LI Xiaoguang;GONG Xiaoping;XING Ling;LIU Yangyang;HAN Bingjun;LI Bingzheng;College of Geology and Mining Engineering,Xinjiang University;No.1Geological Survey Party,Xinjiang Bureau of Geology and Mineral Exploration and Mining;
  • 关键词:卡特巴阿苏金铜矿 ; 中性侵入岩 ; 混源序列 ; 地幔源区 ; 大陆裂谷
  • 英文关键词:Kateba'asu Au-Cu deposit;;neutral intrusive rocks;;mixed source sequence;;mantle source area;;continental rift
  • 中文刊名:YOUS
  • 英文刊名:Nonferrous Metals Engineering
  • 机构:新疆大学地质与矿业工程学院;新疆地质矿产勘查开发局第一区域地质调查大队;
  • 出版日期:2019-07-23
  • 出版单位:有色金属工程
  • 年:2019
  • 期:v.9
  • 基金:国家自然科学基金资助项目(41462004)~~
  • 语种:中文;
  • 页:YOUS201907015
  • 页数:12
  • CN:07
  • ISSN:10-1004/TF
  • 分类号:97-108
摘要
卡特巴阿苏金铜矿矿区中性侵入岩研究表明,中性侵入岩的SiO_2含量较高,稀土元素整体表现为LREE富集,HREE亏损的分馏模式,微量元素总体显示出亏损Nb、Ta、Ti等高场强元素,富集Rb、Ce、Ba、Th等大离子亲石元素。三类中性侵入岩成因无明显的联系,为不同源成岩,属于晚石炭世混源序列,兼具原始地幔和岛弧火山岩的特征,岩石由遭受消减板片流体交代地幔源区部分熔融形成,兼具板内玄武岩和火山弧玄武岩的构造特征,为强烈的大陆裂谷伸展作用的产物。对全岩矿化闪长岩锆石U-Pb测试结果显示,闪长岩的侵位年龄为(305.0±2.0)Ma,为晚石炭世成岩,这与前人获得的载金黄铁矿(310.9±4.2)Ma的年龄在误差范围内一致,认为该矿床形成于造山后伸展环境之下,矿床深部可能存在与中性岩有关的斑岩型铜金矿体。
        The study of neutral intrusive rocks in the Kateba'asu Au-Cu deposit ore mine shows that the content of SiO2 intrusive rocks is higher,and the REEs are characterized by LREE enrichment and fractional distillation of HREE loss.The trace elements generally show loss of high field strength elements such as Nb,Ta,and Ti,enriched in large ion lithophile elements such as Rb,Ce,Ba,and Th.There is no obvious relationship between the three types of neutral intrusive rocks,which are different source rocks and belong to the late Carboniferous mixed source sequence,which is characterized by both the original mantle and the island arc volcanic rocks.The rocks are partially melted by the reduction of the mantle source zone,both the structural characteristics of intraplate basalts and volcanic arc basalts are the products of strong continental rift extension.The zircon U-Pb test results of the whole rock mineralization diorite reveal that the emplacement age of the diorite is(305.0±2.0)Ma,which is the late Carboniferous diagenesis,which is similar to the previous gold-bearing pyrite(310.9 ± 4.2)Ma.The age is consistent within the error range.It is believed that the deposit is formed in the post-orogenic extension of the environment,and there may be associated with the Neoproterozoic porphyry copper-gold ore body.
引文
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