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湖北省鸡笼山金铜矿床煌斑岩地球化学、矿物学特征及其地质意义
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  • 英文篇名:Geochemistry and Mineralogy of Lamprophyre from the Jilongshan Au-Cu Ore Deposit, Hubei Province, and Its Geological Significance
  • 作者:王敏芳 ; 张富成 ; 魏克涛 ; 刘坤 ; 张旭波
  • 英文作者:WANG Min-fang;ZHANG Fu-cheng;WEI Ke-tao;LIU Kun;ZHANG Xu-bo;Faculty of Earth Resources, China University of Geosciences(Wuhan);No.1 Geological Party of Hubei Geological Bureau;Huadian Huazhong Clean Eenergy Co., Ltd.;
  • 关键词:岩石地球化学 ; 矿物化学 ; 煌斑岩 ; 鸡笼山矿床
  • 英文关键词:petrological geochemistry;;mineral chemistry;;lamprophyre;;Jilongshan ore deposit
  • 中文刊名:DQXB
  • 英文刊名:Acta Geoscientica Sinica
  • 机构:中国地质大学(武汉)资源学院;湖北省地质局第一地质大队;华电华中清洁能源有限公司;
  • 出版日期:2018-05-11 09:38
  • 出版单位:地球学报
  • 年:2018
  • 期:v.39;No.176
  • 基金:国家自然科学基金面上项目(编号:41272097);; 国家重点研发计划(编号:2016YFC0600508);; 国家科技重大专项课题(编号:2017ZX05009-002);; 中国地质大学(武汉)教学实验室开放基金项目(编号:SKJ2016013; SKJ2018026)联合资助~~
  • 语种:中文;
  • 页:DQXB201806009
  • 页数:15
  • CN:06
  • ISSN:11-3474/P
  • 分类号:81-95
摘要
湖北省鸡笼山金铜矿床位于长江中下游地区铁铜成矿带西部的九瑞矿集区的丰山矿田中。本文对产于鸡笼山岩体北部的煌斑岩脉进行采样,共计5件样品。在对煌斑岩脉样品进行详细镜下岩相学观察后,开展了全岩地球化学分析,并对其中主要造岩矿物角闪石进行了电子探针成分分析。研究表明,鸡笼山煌斑岩为钙碱性煌斑岩,从角闪石基质到斑晶,由早到晚,角闪石由富Mg、Ti端元向富Fe、Al方向演化;计算得知,鸡笼山煌斑岩中角闪石基质温压条件均明显低于角闪石斑晶,煌斑岩形成时的岩浆体系,从早期到晚期,氧逸度逐渐降低;鸡笼山煌斑岩中角闪石的钛含量明显高于有关报道的煌斑岩中角闪石中的钛含量;结合区域构造演化体制,认为煌斑岩的形成受控于古太平洋板块的俯冲作用,引发软流圈地幔上升,继而在上升减压过程中发生了部分熔融作用,从而形成煌斑岩。
        The Jilongshan Au-Cu deposit is located in the western part of Jiurui area along the Late Mesozoic Middle–Lower Yangtze River Metallogenic Belt(YRMB), eastern China. The authors collected five samples of lamprophyre dikes from the Jilongshan intrusion. The whole rock geochemical analysis and electron microprobe analysis of amphibole in lamprophyre were conducted based on the systematic observation under the microscope. The results show that the lamprophyres are calc-alkaline lamprophyres, and from matrix to phenocryst, the composition of amphibole varies from Mg-, Ti-rich to Fe-, Al-rich. According to the calculation result, the temperature and pressure of amphibole matrix are lower than those of amphibole phenocryst, and oxygen fugacity decreases from the early stage to late stage. Based on the regional tectonic evolution history and the high Ti content of the amphiboles from the lamprophyres in the Jilongshan deposit, the authors hold that the lamprophyres were controlled by the subduction of paleo-pacific plate, which induced the asthenospheric mantle uprising and partial melting.
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