| 琼中麻粒岩的成因:稀土元素地球化学制约 |
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| 引用本文： | 徐德明,马大铨,张业明,付太安,谢才富.琼中麻粒岩的成因:稀土元素地球化学制约[J].华南地质与矿产,2006(2):1-5. |
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| 作者姓名： | 徐德明 马大铨 张业明 付太安 谢才富 |
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| 作者单位： | 宜昌地质矿产研究所,湖北,宜昌,443003 |
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| 基金项目： | 国土资源部国土资源大调查项目 |
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| 摘 要： | 稀土元素地球化学分析表明,琼中麻粒岩可以分为"高Ti"麻粒岩(TiO2含量大于1.0%)和"低Ti"麻粒岩(TiO2含量低于1.0%)两种化学类型."高Ti"麻粒岩以稀土总量高,轻稀土高度富集,轻、重稀土强烈分馏为特征,稀土配分曲线呈右倾单斜型,与本区变基性火山岩的稀土分布特征相似;低"Ti"麻粒岩以稀土总量较低,轻稀土分馏强烈,但重稀土分馏不明显为特征,稀土配分曲线呈重稀土平坦的左高右低型,与许多浅成基性岩的稀土分布特征相似;认为琼中麻粒岩形成于晋宁期的可能性最大.两类麻粒岩的识别,有利于深化对琼中杂岩形成和演化过程的认识.
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| 关 键 词： | 麻粒岩 稀土元素地球化学 岩石成因 琼中 |
| 文章编号： | 1007-3701（2006）02-0001-05 |
| 收稿时间： | 2005-12-16 |
| 修稿时间： | 2005年12月16 |
Genesis of Qiongzhong Granulite:Constraints of Rare Earth Element Geochemistry |
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| XU De-ming,MA Da-qiang,ZHANG Ye-ming,FU Tai-an,XIE Cai-fu.Genesis of Qiongzhong Granulite:Constraints of Rare Earth Element Geochemistry[J].Geology and Mineral Resources of South China,2006(2):1-5. |
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| Authors: | XU De-ming MA Da-qiang ZHANG Ye-ming FU Tai-an XIE Cai-fu |
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| Abstract: | REE data for granulites in Qiongzhong complex reflect the two different chemical subtypes:(1)Samples with TiO_2 contents greater than 1.0%("high Ti" granulites) show rightward incline REE patterns,similar to the patterns of meta-basic volcanics in the complex,with high REE contents,and markedly LREE enrichments and HREE depletions.(2) Samples with TiO2 contents less than 1.0%("low Ti" granulites) show HREE flat patterns,comparable to many shallow basic rocks,with lower REE contents and modest LREE enrichments.Owing to rare-earth element geochemistry constrains on genesis,Qiongzhong granulites likely were formed in Jinning period.Identification of two granulites subtypes can contribute to re-know the process of formation and evolution of Qiongzhong complex. |
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| Keywords: | granulites rare-earth element geochemistry petrogenesis Qiongzhong |
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