A型花岗岩的微量元素地球化学
Trace Element Geochemistry of A-Type Granites
查看参考文献38篇
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文摘
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本文总结和评述了A型花岗岩典型的微量元素特征,如富集Ga、稀土元素(除Eu外)和高场强元素,亏损Ba、Sr和明显的Eu负异常.分别讨论了影响微量元素特征的多种制约因素,主要包括源区性质、岩浆的物理化学条件、岩浆作用过程和络合作用.通过对比世界范围内几个地区相伴生的碱性A型花岗岩和铝质A型花岗岩的微量元素地球化学特征,发现前者Ga、F含量更高,而轻重稀土比值小,Eu、Ba、Sr等元素含量更低,显示了前者的岩浆分异作用更强,同时说明了碱性A型花岗岩可以由与之伴生的铝质A型花岗岩分异而来. |
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其他语种文摘
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Typical characteristics of trace element geochemistry of A-type granites are reviewed and summarized in this paper. They include the enrichment of Gci, REE (except Eu) and high-ficld-strength elements (such as Zr, Nb) . the depletion of Ba and Sr, and the obvious negative Eu anomaly. Several factors controlling features of trace elements are discussed respectively. They include the character of source materials, physical-chemical conditions of the magmas, magmatic processes, and complexation in magmas. The comparison of trace element geochemical characteristics of alkaline A-type granites and those of the associated aluminous A-type granites in several areas show that the alkaline A-type granites has higher Ga and F concentrations, smaller LREE/HREE ratios, lower Eu, Ba. Sr concentrations than those of the associated aluminous A-type granites. These features imply that the alka-line A-type granitic magma was more strongly differentiated than the aluminous A-type granitic magma. This could imply that the alkaline A-type granitic magma could he derived through crystal fractionation from the aluminous A-type granitic magma. |
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来源
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矿物岩石地球化学通报
,2005,24(3):245-251 【扩展库】
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关键词
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A型花岗岩
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微量元素
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铝质A型花岗岩
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碱性A型花岗岩
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地址
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中科院贵阳地球化学所, 地球深部物质与流体作用地球化学实验室, 贵阳, 550002
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语种
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中文 |
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文献类型
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综述型 |
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ISSN
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1007-2802 |
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学科
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地质学 |
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基金
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中国科学院西部之光人才培养计划
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国家973计划
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文献收藏号
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CSCD:2020586
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38
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