| 板内橄榄玄粗岩(shoshonite)地幔流体交代作用及成因的元素地球化学证据:以赣南会昌橄榄玄粗岩为例 |
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| 引用本文： | 章邦桐,吴俊奇,凌洪飞,陈培荣.板内橄榄玄粗岩(shoshonite)地幔流体交代作用及成因的元素地球化学证据:以赣南会昌橄榄玄粗岩为例[J].地球化学,2011(5):443-453. |
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| 作者姓名： | 章邦桐 吴俊奇 凌洪飞 陈培荣 |
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| 作者单位： | 内生金属矿床成矿机制研究国家重点实验室,南京大学地球科学与工程学院,江苏南京210093 |
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| 基金项目： | 中国核工业地质局十一五基础科研项目（YK08）; 内生金属矿床成矿机制研究国家重点实验室研究项目（2008-I-04）;教育部科学研究重大项目（306007） |
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| 摘 要： | 根据稀土元素和微量元素ICP-MS分析结果,通过对流体作用敏感的元素对比值(U/Th、Pb/Ce、Ba/La、Cs/Rb和Ce/Y等)的研究对比,为赣南会昌橄榄玄粗岩的形成有地幔流体交代作用参与提供了重要的地球化学证据.应用主元素氧化物(K2O、Na2O、FeOT、CaO、MgO和TiO2)与SiO2的变异分析,判明会...
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| 关 键 词： | 板内橄榄玄粗岩 地幔流体交代作用 岩石圈富集地幔 亏损地幔 会昌 江西省 |
Elemental geochemical evidence for genesis of intraplate shoshouite and mantle-derived fluid metasomatism： Shoshonite from Huichang, Southern Jiangxi Province as an example |
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| ZHANG Bang-tong,WU Jun-qi,LING Hong-fei and CHEN Pei-rong.Elemental geochemical evidence for genesis of intraplate shoshouite and mantle-derived fluid metasomatism： Shoshonite from Huichang, Southern Jiangxi Province as an example[J].Geochimica,2011(5):443-453. |
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| Authors: | ZHANG Bang-tong WU Jun-qi LING Hong-fei and CHEN Pei-rong |
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| Institution: | (State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210093, China) |
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| Abstract: | Fluid-sensitive trace element ratios, such as U/Th, Pb/Ce, Ba/La, Cs/Rb and Ce/Y, in shoshonites from Huichang, southern Jiangxi Province, are studied in this paper, providing important evidence for mantle-derived fluid metasomatism in formation of the rocks. 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. Based on these elemental characteristics, together with Sr-Nd-O-Pb isotopic compositions and Nd isotopic model ages, it is inferred here that the Huaichang shoshonite, southern Jiangxi Province, was formed by mixing of magmas derived from the enriched paleo-continent （Gondwana？） lithospheric mantle with that from the Mesozoic depleted mantle. |
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| Keywords: | intraplate shoshonite metasomatism by mantle-derived fluid enriched lithospheric mantle depleted mantle Huichang Jiangxi Province |
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