| A型花岗岩的微量元素地球化学 |
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| 引用本文： | 苏玉平,唐红峰.A型花岗岩的微量元素地球化学[J].矿物岩石地球化学通报,2005,24(3):245-251. |
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| 作者姓名： | 苏玉平 唐红峰 |
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| 作者单位： | 1. 中国科学院,地球化学研究所,地球深部物质与流体作用地球化学研究室,贵阳,550002;中国科学院,研究生院,北京,100039
2. 中国科学院,地球化学研究所,地球深部物质与流体作用地球化学研究室,贵阳,550002 |
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| 基金项目： | 中国科学院西部之光计划资助项目（2002年度）;国家重点基础研究发展规划资助项目（2001CB409805）. |
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| 摘 要： | 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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| 关 键 词： | A型花岗岩 微量元素 铝质A型花岗岩 碱性A型花岗岩 |
| 文章编号： | 1007-2802（2005）03-0245-07 |
| 收稿时间： | 2005-05-19 |
| 修稿时间： | 2005-05-31 |
Trace Element Geochemistry of A-Type Granites |
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| SU Yu-ping,TANG Hong-feng.Trace Element Geochemistry of A-Type Granites[J].Bulletin of Mineralogy Petrology and Geochemistry,2005,24(3):245-251. |
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| Authors: | SU Yu-ping TANG Hong-feng |
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| Abstract: | Typical characteristics of trace element geochemistry of A-type granites are reviewed and summarized in this paper. They include the enrichment of Ga, REE (except Eu) and high-field-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 alkaline 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 be derived through crystal fractionation from the aluminous A-type granitic magma. |
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| Keywords: | A-type granite trace element aluminous A-type granite alkaline A-type granite |
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