| 中国东部部分地区新生代岩石圈地幔的成因:主量和微量元素制约 |
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| 引用本文： | 刘海泉,闫峻,赵建新,安亚军.中国东部部分地区新生代岩石圈地幔的成因:主量和微量元素制约[J].岩石学报,2010,26(9):2850-2868. |
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| 作者姓名： | 刘海泉 闫峻 赵建新 安亚军 |
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| 作者单位： | 1. 合肥工业大学资源与环境工程学院,合肥,230009
2. 澳大利亚昆士兰大学放射性同位素实验室,布里斯班,4072 |
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| 基金项目： | 本文受国家自然科学基金项目(40772040、90714009)资助. |
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| 摘 要： | 为厘定中国东部新生代岩石圈地幔的成因,进而探讨岩石圈减薄的方式,本文选择汉诺坝、女山、盘石山和方山尖晶石二辉橄榄岩作为研究对象,系统分析了其主、微量元素。结果表明,这些地区新生代岩石圈地幔具有"新生"的性质,为上涌的软流圈物质经过小于10%的部分熔融程度后的残留相形成,后又经历了类似新生代玄武岩性质的富硅熔体的交代,交代介质的物质贡献小于3%。新生代岩石圈地幔与古老克拉通岩石圈地幔在主、微量元素上的显著差异以及新生代岩石圈地幔微量元素特征的拟合,支持拆沉为华北克拉通东部减薄的主要方式。
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| 关 键 词： | 橄榄岩包体 软流圈 微量元素 减薄 华北克拉通 |
| 收稿时间： | 7/1/2010 12:00:00 AM |
| 修稿时间： | 2010/8/17 0:00:00 |
Origin of Cenozoic lithospheric mantle in several areas of eastern China: Constraints from major and trace elements. |
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| LIU HaiQuan,YAN Jun,ZHAO JianXin and AN YaJun.Origin of Cenozoic lithospheric mantle in several areas of eastern China: Constraints from major and trace elements.[J].Acta Petrologica Sinica,2010,26(9):2850-2868. |
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| Authors: | LIU HaiQuan YAN Jun ZHAO JianXin and AN YaJun |
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| Institution: | School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China;School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China;Radiogenic Isotope Laboratory, Centre for Microscopy and Microanalysis, The University of Queensland, Brisbane 4072, Australia;School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China |
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| Abstract: | Systematic major and trace elements analysis of spinel-lherzolites from Hannuoba, Nushan, Panshishan and Fangshan is carried out to identify the origin of Cenozoic lithosphere in eastern China and to further discuss the mechanisms of lithospheric thinning. The results indicate these areas share a"juvenile"lithospheric mantle, which is residual of upwelling mantle which ever underwent less than 10% partial melting. A less than 3% contribution of silica-enriched basaltic melts analogous to Cenozoic basalt in eastern China was involved in later metasomatism over Cenozoic lithospheric mantle. Distinctive dissimilarity between Cenozoic lithospheric mantle and Archean Cratonic lithospheric mantle in respect of major and trace elements, combined with remarkable similarity to partial melting and metasomatism modeling of trace elements argue predominately thinning mechanism of detachment for eastern North China Craton lithospheric mantle. |
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| Keywords: | Peridotitic xenoliths Asthenosphere Trace elements Thinning North China Craton |
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