刘军,息朝庄,黄波,杨涛,夏浩东,邓会娟.柴达木西北缘大通沟南山北闪长岩年代学、地球化学特征及其地质意义[J].西北地质,2022,55(2):93-105 LIU Jun,XI Chaozhuang,HUANG Bo,YANG Tao,XIA Haodong,DENG Huijuan.Geochronology, Geochemistry and Geological Significance of Thediorite in Datonggou Nanshanbei, Northwestern Qaidam Basin[J].Northwestern Geology,2022,55(2):93-105
柴达木西北缘大通沟南山北闪长岩年代学、地球化学特征及其地质意义
Geochronology, Geochemistry and Geological Significance of Thediorite in Datonggou Nanshanbei, Northwestern Qaidam Basin
投稿时间:2021-05-22  修订日期:2021-11-25
DOI:10.19751/j.cnki.61-1149/p.2022.02.007
中文关键词:  大通沟南山北;闪长岩;年代学;地球化学;柴达木西北缘
英文关键词:Datonggou Nanshanbei;diorite;chronology;geochemistry;northwestern Qaidam basin
基金项目:国家自然科学基金和贵州喀斯特科学研究中心联合项目(U1812402);贵州理工学院高层次人才科研启动项目“贵州实物地质资料汇聚与服务体系建设研究”(XJGC20161101);湖南省教育厅科学研究一般项目“湘东北万大型金矿床毒砂Re-Os年代学研究”(20C0381);益阳市社科联项目(2021YS133)。
作者单位E-mail
刘军 西安西北有色物化探总队有限公司, 陕西 西安 710068  
息朝庄 湖南城市学院土木工程学院, 湖南 益阳 413000 xczcsummmmm@126.com 
黄波 贵州省有色金属和核工业地质勘查局物化探总队, 贵州 都匀 558000  
杨涛 贵州理工学院建筑与城乡规划学院, 贵州 贵阳 550000  
夏浩东 中国地质调查局自然资源实物地质资料中心, 河北 燕郊 065201  
邓会娟 中国地质调查局自然资源实物地质资料中心, 河北 燕郊 065201  
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中文摘要:
      大通沟南山北闪长岩岩体位于柴达木地块西北缘,岩石类型为石英闪长岩、闪长岩、花岗闪长岩,具有高硅、富碱、富铝、贫钛特征。A/CNK值为1.52~1.57,均大于1.10,为强过铝质花岗岩;轻稀土富集,重稀土亏损,具负Eu异常,标准化曲线呈明显的右倾型;富集Rb、Th、K等大离子亲石元素和轻稀土元素,相对亏损Nb、Ti、Y、Yb等高场强元素,Sr、P、Ti元素呈“V”型谷,具有明显亏损。通过对地球化学研究,表明岩浆来源于以砂屑岩为主的壳幔混合源,岩体成因类型属I-型花岗岩;LA-ICP-MS锆石U-Pb定年结果为(270±3) Ma (MSWD=0.076),系早—中二叠世岩浆活动的产物,形成于俯冲环境下的岛弧花岗岩。
英文摘要:
      The Datonggou Nanshanbei diorite body is located in the northwest Qaidam basin, with the main rock types quartz diorite, diorite and granodiorite, and it is characterized by high silicon, rich alkali, rich aluminum and poor titanium. A/CNK ranges from 1.52 to 1.57, more than 1.10, and belongs to strong peraluminous granite type. Light rare earth elements (LREE) is enriched while heavy rare earth elements is depleted, and there is negative Eu anomaly. The normalized curve is obviously right inclined, with the feature of enrichment of large ion lithophile elements Rb, Th, K and LREE and the relative depletion of high field strength elements Nb, Ti, Y, Yb. The elements such as Sr, P and Ti show a "V" shaped valley with obvious depletion. The geochemical study shows that the magma is derived from the crust-mantle mixed source mainly composed of arenaceous rocks, and the genetic type belongs to I-type granite. LA-ICP-MS zircon U-Pb dating shows that the zircon formation age is (270±3) Ma (MSWD=0.076), which is the product of magmatic activity in the Middle to Early Permian, and was formed in the island arc granite under subduction environment.
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