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拉萨地块中北部尼雄地区早白垩世火山岩的成因及构造意义
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  • 英文篇名:The Petrogenesis and Tectonic Significance of Early Cretaceous Volcanic Rocks in Nixiong Area from the Central and Northern Lhasa Terrane
  • 作者:苟正彬 ; 刘函 ; 李俊 ; 崔浩杰 ; 杨洋
  • 英文作者:Gou Zhengbin;Liu Han;Li Jun;Cui Haojie;Yang Yang;Chengdu Center of China Geological Survey;College of Earth Science,Chengdu University of Technology;
  • 关键词:青藏高原 ; 拉萨地块 ; 早白垩世 ; 火山作用 ; 岩石成因 ; 地球化学 ; 地质年代学
  • 英文关键词:Tibetan Plateau;;Lhasa terrane;;Early Cretaceous;;volcanism;;petrogensis;;geochemistry;;geochronology
  • 中文刊名:DQKX
  • 英文刊名:Earth Science
  • 机构:中国地质调查局成都地质调查中心;成都理工大学地球科学学院;
  • 出版日期:2018-06-20 08:48
  • 出版单位:地球科学
  • 年:2018
  • 期:v.43
  • 基金:国家自然科学基金项目(Nos.41773026,41303028);; 中国地质调查局项目(No.DD20160015);; 四川省基金项目(No.2014JQ0025)
  • 语种:中文;
  • 页:DQKX201808019
  • 页数:15
  • CN:08
  • ISSN:42-1874/P
  • 分类号:258-272
摘要
以往的研究多侧重于拉萨地体中南部,对拉萨地块中北部地区的火山岩浆活动的分布特点、火山岩成因及构造意义关注相对较少,且对该地区中生代火山岩的成因机制存在不同认识.尼雄地区广泛发育的白垩纪火山岩保存了大量青藏高原新生代之前的地质演化信息.岩石学和锆石U-Pb定年研究表明,火山岩类型主要为玄武安山岩、粗面安山岩和流纹岩,其SiO_2含量为55.76%~77.78%,铝饱和指数(A/CNK)为0.89~3.04,属高钾钙碱性-碱钙性、偏铝质-过铝质岩石;其富集Th、U,亏损Nb、Ta等高场强元素,显示出A型花岗质岩石特征;此外,流纹岩具有较高的SiO_2含量和极低的MgO、TiO_2、P_2O_5含量及δEu值,相对亏损Ba、Nb、Ta、Sr和Eu等元素,与高分异的A型流纹岩特征一致.从1个玄武安山岩、1个粗面安山岩和2个流纹岩样品中获得的岩浆锆石U-Pb年龄分别为117 Ma、127 Ma和126~127 Ma,代表了尼雄地区早白垩世火山岩的形成年龄,否定了前人把尼雄地区火山岩全归属为始新世林子宗群年波组或渐新世日贡拉组的认识.综合研究表明,玄武安山岩、粗面安山岩和流纹岩可能为壳幔熔体混合的结果,并伴随着一定的分离结晶作用.它们可能同时受到班公湖-怒江洋壳向南、雅鲁藏布江新特提斯洋壳向北双向俯冲的影响.
        Many studies have been focused on the central and southern Lhasa terrane,but it remains controversial as to the genetic mechanism of the Mesozoic volcanic rocks in the central and northern Lhasa terrane due to less attention paid to the distribution characteristics of volcanic magmatism,the origin of volcanic rocks,and the tectonic significance of the volcanic rocks.Early Cretaceous volcanic rocks are widely exposed in Nixiong area,which record abundant pre-Cenozoic evolutionary geohistory of the Tibetan Plateau.Petrological and zircon U-Pb dating analyses show that the volcanic rocks are mainly composed of basalitic andesite,trachyandesite and rhyolites.They have variable SiO_2 contents ranging from 55.76% to 77.78%,and alumina saturation index(A/CNK)of 0.89-3.04,indicative of high-K calc-alkaline to alkaline-calc and metaluminous to peraluminous.They are characterized by the enrichment of Th and U,and the depletion of HFSEs(such as Nb and Ta),typical of A-type granitoids.In addition,rhyolites show distinct high SiO_2,but low MgO,TiO_2,P_2O_5 andδEu,and displayfiercely negative Ba,Nb,Ta,Sr and Eu anomalies,suggesting that they are highly fractionated A-type rocks.LA-ICP-MS U-Pb dating of magmatic zircons from one basalitic andesite,one trachyandesite and two rhyolites samples indicate that they were formed at 117 Ma,127 Ma and 126-127 Ma,respectively.It is proved that results of previous studies are wrong in that the volcanic rocks in Nixiong area are all Eocene Nianbo Formation of Lingzizhong group or Oligocene Rigongla Formation.In addition,it is found that the basalitic andesite,trachyandesite and rhyolites are likely derived from partial melting of a crustmantle mixed source,and have experienced significant fractional crystallization.We speculate that the studied rocks have been affected by double subduction of southward subduction of Bangong Co-Nujiang Tethys oceanic crust,and northward subduction of Yalung-Zangbo oceanic crust.
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