青藏高原中部麻米地区晚侏罗世火山岩岩石成因及其地质意义
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  • 英文篇名:Petrogenesis and Geological Significance of Late Jurassic Volcanic Rocks in Mami Area, Central Tibetan Plateau
  • 作者:刘海永 ; 岳鋆璋 ; 顿珠旺堆 ; 旺姆 ; 毛国正 ; 吴浩
  • 英文作者:Liu Haiyong;Yue Yunzhang;Dunzhu Wangdui;Wang Mu;Mao Guozheng;Wu Hao;Tibet Institute of Geological Survey;The Second Geological Party,Tibet Bureau of Geology and Mineral Exploration and Development;Regional Geological Survey Party,Tibet Bureau of Geology and Mineral Exploration and Development;The Western Exploration Group,Tibet Bureau of Geology and Mineral Exploration and Development;School of Earth Sciences and Engineering,Hohai University;
  • 关键词:青藏高原中部 ; 晚侏罗世 ; 火山岩 ; 锆石U-Pb定年 ; 地球化学
  • 英文关键词:central Tibetan Plateau;;Late Jurassic;;volcanics;;zircon U-Pb dating;;geochemistry
  • 中文刊名:DQKX
  • 英文刊名:Earth Science
  • 机构:西藏自治区地质调查院;西藏地勘局第二地质大队;西藏地勘局区域地质调查大队;西藏地勘局西勘集团;河海大学地球科学与工程学院;
  • 出版日期:2018-12-11 15:06
  • 出版单位:地球科学
  • 年:2019
  • 期:v.44
  • 基金:中国地质调查局项目(Nos.DD20160026,DD20160345)
  • 语种:中文;
  • 页:DQKX201907013
  • 页数:15
  • CN:07
  • ISSN:42-1874/P
  • 分类号:193-207
摘要
在青藏高原中部中拉萨地块之上新识别了一套晚侏罗世-早白垩世早期岩浆岩,本次对其中麻米地区出露的火山岩进行了锆石U-Pb定年与全岩主微量元素分析研究工作.测年结果显示麻米火山岩形成于晚侏罗世(152~150 Ma),岩石地球化学具有高SiO_2、高全碱含量(Na_2O+K_2O)、低MgO、低P_2O_5的特征,并显示明显的Eu、Sr、Ba等元素的亏损,具有高分异I型花岗质岩石的特征.结合区域上报道的同期中酸性侵入岩资料,麻米酸性火山岩起源于古老地壳物质重熔并经历了广泛的结晶分异作用.本文研究表明中拉萨地块上晚侏罗世-早白垩世早期岩浆作用形成于洋壳俯冲背景,应该是新特提斯洋北向俯冲过程中引发的弧型岩浆事件.
        A new Late Jurassic-Early Cretaceous magmatic belt has been identified in the central Tibetan Plateau.This paper reports two zircon U-Pb ages and also new whole-rock major and trace element data of the newly discovered volcanic rocks in Mami area.These volcanic rocks were dated as Late Jurassic(152-150 Ma).The studied samples are characterized by high SiO_2content,high alkali,low MgO,and low P_2O_5 abundances,with significant depletion in Eu,Sr,and Ba,suggesting a geochemical affinity with highly fractionated I-type granites.It is concluded that the volcanic rocks were derived by partial melting of ancient mafic lower crust,followed by fractional crystallization.Our research propose that Late Jurassic-Early Cretaceous magmatic magmatism occurred in an oceanic subduction setting,likely related to the northward subduction of the NeoTethys oceanic lithosphere.
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