首页 | 本学科首页   官方微博 | 高级检索  
     检索      

桂东南富钾岩浆岩岩的Nd同位素组成:华南中生代地幔物质上涌事件
引用本文:郭新生,汤加富,等.桂东南富钾岩浆岩岩的Nd同位素组成:华南中生代地幔物质上涌事件[J].岩石学报,2001,17(1):19-27.
作者姓名:郭新生  汤加富
作者单位:1. 中国科学技术大学地球和空间科学系化学地球动力学研究实验室,
2. 安徽省地质调查院,
基金项目:国家自然科学基金(49773178)资助项目.
摘    要:广西东南部罗容杂岩体由辉长岩-闪长岩-二长岩-正长岩组成,马山由碱性辉长岩-正长岩-花岗闪长岩-花岗岩组成。它们富K、富大离子亲石元素(LIL),无Nb、Ta负异常等特征表明它们是形成于板内环境的钾玄质侵入岩。罗容杂岩体的各种岩石和马山的基性岩的εNd(T)稍低,为-0.6,此岩石单元是由幔源岩浆加热地壳使之熔融的壳源岩浆形成的,并伴有幔源岩浆的混合或交换。此二杂岩体形成于拉张构造环境。地幔物质上涌导致了中生代华南地壳张裂以及华南大规模花岗岩和相关矿床的形成。

关 键 词:地幔上涌  富钾侵入岩  锶同位素  钕同位素  中生代  岩石地球化学特征
修稿时间:2000年8月21日

Nd isotopic ratios of K-enriched magmatic complexes from southeastern Guangxi province: Implications for upwelling of the mantle in southeastern China during the Mesozoic.
GUO XinSheng,CHEN JiangFeng,ZHANG Xun,TANG JiaFu,XIE Zhi,ZHOU TaiXi and LIU YuLong. . Laboratory for Chemical Geodynamics.Nd isotopic ratios of K-enriched magmatic complexes from southeastern Guangxi province: Implications for upwelling of the mantle in southeastern China during the Mesozoic.[J].Acta Petrologica Sinica,2001,17(1):19-27.
Authors:GUO XinSheng  CHEN JiangFeng  ZHANG Xun  TANG JiaFu  XIE Zhi  ZHOU TaiXi and LIU YuLong Laboratory for Chemical Geodynamics
Institution:GUO XinSheng,CHEN JiangFeng,ZHANG Xun,TANG JiaFu,XIE Zhi,ZHOU TaiXi and LIU YuLong. . Laboratory for Chemical Geodynamics,Department of Earth and Space Sciences,University of Science and Technology of Chin,Hefei,Chin,. Geological Sur
Abstract:Luorong complex is composed of gabbro, diorite, monzonite and syenite, and Mashan alkaline gabbro, syenite, granodiorite and granite. They are enriched in K and LIL elements with no negative anomaly in Nb and Ta. These characteristics suggest that they belong to shoshonitic series formed in intraplate environment. All rock types in the Luorong and mafic units in the Mashan complex show high εNd(T) ranging from +1.5 to +3.3, suggesting that they were formed by fractionation of magma generated by partial melting of a metasomatized mantle in the deep crustal level. However, granite of the Mashan gives slightly lower εNd(T) -0.6, that suggests that it was formed by melting of the crust heated by the upwelling mafic magma. The near zero εNd(T) suggests an involvement of the mantle-derived component by mixing or isotope exchange. The two complexes were formed in an extensional tectonic environment. The upwelling of the mantle was responsible for the extension of the crust of southeastern China, the formation of the extensive granitic magmatism and related ore deposits during the Mesozoic era.
Keywords:K-enriched magmatic series  Nd and Sr isotopic ratios  Upwelling of the mantle  Southeastern Guangxi
本文献已被 CNKI 维普 万方数据 等数据库收录!
点击此处可从《岩石学报》浏览原始摘要信息
点击此处可从《岩石学报》下载免费的PDF全文
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号