| 广西钦甲花岗岩体岩石地球化学特征及成因研究 |
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| 引用本文： | 王永磊,王登红,张长青,王成辉.广西钦甲花岗岩体岩石地球化学特征及成因研究[J].岩石矿物学杂志,2012,31(2):155-163. |
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| 作者姓名： | 王永磊 王登红 张长青 王成辉 |
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| 作者单位： | 中国地质科学院矿产资源研究所,国土资源部成矿作用与资源评价重点实验室,北京100037 |
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| 基金项目： | 全国危机矿山接替资源找矿项目之桂东-粤西地区铅锌金等矿床成矿规律总结研究(20089946);中央级公益性科研院所基本科研业务费专项资金(K0907) |
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| 摘 要： | 华南地区加里东期花岗岩远不如燕山期那么发育,位于广西西南部的钦甲岩体是较为著名的加里东岩体之一。钦甲岩体位于扬子板块西南缘,属早古生代花岗岩体。本文在前期年代学研究的基础上对钦甲岩体的岩石地球化学特征进行了分析探讨,其SiO2含量为65.94%~72.23%,全碱含量(K2O+Na2O)为6.27%~9.11%,K2O的含量普遍大于Na2O,A/CNK值为1.02~1.24,属弱过铝质花岗岩类。岩石稀土元素含量偏低,变化范围为17.18×10-6~128.33×10-6,其配分曲线呈轻稀土富集并缓向右倾斜、重稀土较为平坦、具较明显的铕负异常。微量元素以富集大离子元素Rb、Th,亏损Ba、Sr为特征,其形成可能和扬子板块与华夏板块之间的汇聚挤压有关,其源岩主要由含少量泥质的砂质岩组成,并可能有具Ce负异常的沉积物参与部分熔融。
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| 关 键 词： | 加里东 地球化学特征 花岗岩成因 Ce负异常 钦甲岩体 |
| 收稿时间： | 2011/4/13 0:00:00 |
| 修稿时间： | 2011/9/30 0:00:00 |
Geochemistry and petrogenesis of the Qinjia granite in Guangxi |
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| WANG Yong-lei,WANG Deng-hong,ZHANG Chang-qing and WANG Cheng-hui.Geochemistry and petrogenesis of the Qinjia granite in Guangxi[J].Acta Petrologica Et Mineralogica,2012,31(2):155-163. |
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| Authors: | WANG Yong-lei WANG Deng-hong ZHANG Chang-qing and WANG Cheng-hui |
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| Institution: | (MRL Key Laboratory of Metallogeny and Mineral Assessment,Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing 100037,China) |
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| Abstract: | The Caledonian granites in South China are not so well developed as Yanshanian granites,and the Qinjia granite in southwest Guangxi is one of the famous Caledonian granites.The Qinjia granitoid pluton,located at the southwestern edge of Yangtze plate,is a typical Early Paleozoic pluton.Based on previous research result of geochronology,the authors performed a lot of detailed work on geochemistry.The SiO2 content of rocks is in the range of 65.94%～72.23%, the total alkalis content(K2O+Na2O) is in the range of 6.27%～9.11%,and the K2O content of most rocks is higher than Na2O content.The A/CNK values are 1.02～1.24,assigned to species of weakly peralumious.The rocks have low and remarkably varying REE,ranging from 17.18×10-6 to 128.33×10-6,and their distribution patterns show LREE enrichment with gentle rightly-oblique deviation,relatively flat HREE and significant negative Eu anomaly.In trace elements,the Qinjia pluton is enriched in LILE Rb,Th and depleted in Ba,Sr.The research results show that the formation of Qinjia granite was probably linked with the collision between Yangtze plate and Cathaysia plate,and the source rocks of Qinjia granite were mainly composed of politic sandstone rocks,and some sediments with negative Ce anomalies probably entered magma source. |
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| Keywords: | Caledonian geochemical charteristics granite genesis negative Ce anomalies Qinjia granite |
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