Elemental Geochemical Evidence for Genesis of Intraplate Shoshonite and Mantle-Derived Fluid Metasomatism: Taking Shoshonite from Huichang, Southern <?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" /><st1:place w:st="on"><st1:PlaceName w:st="on">Jiangxi</st1:PlaceName> <st1:PlaceType w:st="on">Province</st1:PlaceType></st1:place> as an Example

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Elemental Geochemical Evidence for Genesis of Intraplate Shoshonite and Mantle-Derived Fluid Metasomatism: Taking Shoshonite from Huichang, Southern Jiangxi Province as an Example

详细信息

责任者：Zhang Bangtong (State Key Laboratory of Mineral Deposits Research ; School of Earth Sciences and Engineering ; Nanjing University ; Nanjing 210093 ; China) ; Wu Junqi
刊名：Geochimica
出版年：2011
卷期：40(5)
关键词：橄榄玄武岩 ; olivine basalt ; 橄榄粗安岩 ; mugearite ; 地幔流体 ; mantle fluids ; 元素地球化学 ; elements geochemistry ; 江西 ; Jiangxi Province
页码：p.443-453
图表：6 illus., 2 tables, 22 refs.
分类号：0801
出版序号：1661
issnNo：ISSN0379-1726
isbnNo：CN44-1398/P

摘要

///Fluid-sensitive trace element ratios, in shoshonites from Huichang, southern Jiangxi Province, are studied in this paper. Analysis on variations of SiO₂ versus K₂O, Na₂O, FeOT, CaO, MgO and TiO₂ shows that the Huichang shoshonite was not formed through crystallization fractionation of a high-K calcalkalic magma. From Ta/Hf-Th/Hf discrimination diagram, it is concluded that it was formed in the intraplate tectonic setting. Combined with Sr-Nd-O-Pb isotopic compositions and Nd isotopic model ages, it is inferred here that the Huaichang shoshonite, was formed by mixing of magmas derived from the enriched paleo-continent (Gondwana?) lithospheric mantle with that from the Mesozoic depleted mantle.