| Jurassic Intra-plate Basaltic Magmatism in Southeast China: Evidence from Geological and Geochemical Characteristics of the Chebu Gabbroite in Southern Jiangxi Province |
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| 作者姓名： | XIE Guiqing MAO Jingwen HU Ruizhong LI Ruiling JIANG Guohao CAO Jinjian and ZHAO Junhong State Key Laboratory of Geological Process and Mineral Resourses China University of Geosciences Beijing Institute of Mineral Resources Chinese Academy of Geological Sciences Beijing Institute of Geochemistry Chinese Academy of Sciences Guiyang Guizhou Earth Science |
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| 作者单位： | [1]State Key Laboratory of Geological Process and Mineral Resourses, China University of Geosciences, Beijing 100083 [2]Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037 [3]Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, Guizhou 550002 [4]Earth Science Department, Sun Yat-Sun University, Guangzhou, Guangdong 510275
Earth Science Department, Sun Yat-Sun University, Guangzhou, Guangdong 510275 |
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| 基金项目： | 中国博士后科学基金;科技部资助项目 |
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| 摘 要： | Geochemical and isotopic investigations have been carded out on the Chebu gabbroite in southern Jiangxi Province, southeast China and these results are compared with gabbro bodies along the coast of Fujian Province in order to understand their magma sources and tectonic implications. The Chebu intrusion formed at the beginning of the Middle Jurassic （172~4.3 Ma）. These rocks are Ti-rich and Al-poor in major elements, characterized by strong enrichment in large-ion lithophile elements （LILE） and moderate enrichment in high field strength elements （HFSE） and light rare-earth elements CLREE）, without pronounced Nb or Ta anomalies. Age-correlated Sr-Nd isotope ratios show moderately high ranges of （^87Sr/^86Sr）i from 0.7065 to 0.7086 and 0.5124 to 0.5125 of （^143Nd/^144Nd）i. The geochemical characteristics of the Chebu gabbroite suggest that it is notably different from island-arc basalt and similar to intra-plate basaltic rocks. By combining interpretations of its geological and geochemical characteristics and the regional geological development history, the Chebu gabbroitic intrusion is thought to be the product of asthenosphere upwelling and rapid lithosphere extension during a transition of tectonic systems in southeast China. The tectonic environment and source characteristics of the intrusion are different from Cretaceous gabbro bodies along the coast of Fujian Province, The former formed in a tectonic environment of rapid intra-plate lithospheric extension and the source characteristics were of a weakly enriched primitive mantle, whereas the latter originated mainly in a volcanic-magmatic arc extensional tectonic environment and the nature of the source was an enriched mantle with more subduct subducted components.
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| 关 键 词： | 侏罗纪 玄武岩 江西 地质化学 地质动力学 |
Jurassic Intra-plate Basaltic Magmatism in Southeast China: Evidence from Geological and Geochemical Characteristics of the Chebu Gabbroite in Southern Jiangxi Province |
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| Authors: | XIE Guiqing MAO Jingwen HU Ruizhong LI Ruiling JIANG Guohao CAO Jinjian and ZHAO Junhong State Key Laboratory of Geological Process and Mineral Resourses China University of Geosciences Beijing |
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| Institution: | XIE Guiqing,MAO Jingwen,HU Ruizhong,LI Ruiling,JIANG Guohao,CAO Jinjian and ZHAO Junhong State Key Laboratory of Geological Process and Mineral Resourses,China University of Geosciences,Beijing,Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing Institute of Geochemistry,Chinese Academy of Sciences,Guiyang,Guizhou Earth Science Department,Sun Yat-Sun University,Guangzhou,Guangdong |
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| Abstract: | |
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| Keywords: | gabbroite geochemical characteristics geodynamics setting Jurassic Jiangxi southeast China |
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