| 河北阳原新生代玄武岩中橄榄岩捕虏体矿物化学:华北岩石圈地幔演化 |
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| 引用本文： | 陈曦,郑建平.河北阳原新生代玄武岩中橄榄岩捕虏体矿物化学:华北岩石圈地幔演化[J].地球科学,2009,34(1). |
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| 作者姓名： | 陈曦 郑建平 |
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| 作者单位： | 中国地质大学地球科学学院,中国地质大学地质过程与矿产费源国家重点实验室,湖北武汉,430074
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| 基金项目： | 国家自然科学基金，国家杰出青年科学基金 |
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| 摘 要： | 橄榄岩及其中矿物的组成,特别是单斜辉石的微量元素,可以很好的揭示岩石圈地幔性质.在对河北阳原新生代玄武岩中橄榄岩捕虏体详细岩相学和矿物化学研究基础上,重点分析了单斜辉石的激光原位微量元素,讨论了新生代华北内部山带岩石圈地幔特征及其演化机制.阳原地区陆下岩石圈,除个别样品的部分熔融程度为15%～20%外,多数样品＜5%,显示该区的地幔演化是不均一的,并表现为饱满与难熔一过渡型地幔的交叉并存.这种共存现象可以用软流圈物质对古老地幔进行不均匀侵蚀、改造和置换作用来解释.
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| 关 键 词： | 橄榄岩 矿物化学 侵蚀 置换 不均匀性 华北 |
Mineral Chemistry of Peridotite Xenoliths in Yangyuan Cenozoic Basalts:Significance for Lithospheric Mantle Evolution beneath the North China Craton |
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| CHEN Xi,ZHENG Jian-pingFaculty of Earth Sciences,State Key Laboratory of Geological Processes , Mineral Resources,China University of Geosciences,Wuhan,China.Mineral Chemistry of Peridotite Xenoliths in Yangyuan Cenozoic Basalts:Significance for Lithospheric Mantle Evolution beneath the North China Craton[J].Earth Science-Journal of China University of Geosciences,2009,34(1). |
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| Authors: | CHEN Xi ZHENG Jian-pingFaculty of Earth Sciences State Key Laboratory of Geological Processes Mineral Resources China University of Geosciences Wuhan China |
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| Institution: | CHEN Xi,ZHENG Jian-pingFaculty of Earth Sciences,State Key Laboratory of Geological Processes , Mineral Resources,China University of Geosciences,Wuhan430074,China |
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| Abstract: | The compositions of the minerals and peridotites,especially trace elements of clinopyroxene(Cpx)can well reflect the characteristics of the subcontinental lithospheric mantle(SCLM).Based on the petrographical study of peridotite xenoliths in Yangyuan Cenozoic basalts and chemical study of minerals,the paper mainly analyzes the LAM-ICP-MS trace element compositions of Cpx from the Yangyuan peridotitic xenoliths and discusses the nature and evolution of the Cenozoic SCLM beneath the center of the Trans-North ... |
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| Keywords: | peridotites mineral chemistry asthenospheric erosion mantle replacement heterogeneity North China craton |
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