| 汪明,彭振安,梁玲慧,刘虎,郭腾飞,封金鹏,黄敦杰.广西滴水花岗岩地球化学特征与离子吸附型稀土矿床[J].矿产勘查,2013,4(3):273-282 |
| 广西滴水花岗岩地球化学特征与离子吸附型稀土矿床 |
| Geochemical characteristics and ion adsorption type rare earth deposit of Dishui granite in Guangxi |
| 投稿时间：2012-11-20 |
| DOI： |
| 中文关键词: 地球化学特征 离子吸附型稀土矿床 滴水花岗岩 广西 |
| 英文关键词: geochemical characteristics ion adsorption rare earth deposit Dishui granite Guanagxi |
| 基金项目:广西科学基金项目(编号:桂科回0991001)和广西大学科研基金项目(编号:BXZ090946)共同资助。 |
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| 中文摘要: |
| 滴水花岗岩体整体上高硅富碱,富Al、Nb、Y、Th、Rb等元素,低P、Ca、Ti、Ba、Sr等元素,地球化学特征显示为过铝质高钾钙碱性系列S型花岗岩；稀土元素∑REE为(198.45～433.76)×10-6,平均为291.86×10-6,∑LREE/∑HREE为0.341～0.744,富集重稀土,Eu强烈亏损,元素富集和亏损具有选择性,岩浆分异作用强,成岩构造环境为板块边缘附近的板内构造环境。岩体风化强烈,形成4～9 m厚的风化壳,风化壳稀土含量高,主要为富钇重稀土矿。离子吸附型稀土矿体主要赋存在花岗岩风化壳全风化层中。该区稀土矿化与黑云母二长花岗岩稀土元素的高丰度值、良好的构造条件、利于岩体风化和稀土元素富集的地形地貌及气候条件密切相关。 |
| 英文摘要: |
| The geochemical characteristics of Dishui granite is characterized with enriched Si and alkali compositions,high concentrations of Al、Nb、Y、Th and Rb elements and low concentrations of P、Ca、Ti、Ba、Sr and Ti elements.Based on its geochemical charateristic, the Dishui granite can be classified into S-type granite, i.e., aluminumsupersaturated and high potassium calc-alkaline series granite. The range of∑REE of the granite is from 198.45×10-6 to 433.76×10-6, the ratio of ∑LREE/∑HREE is from 0.341 to 0. 744.It indicated that the granite is enriched in heavy rare earth elements and strong Eu loss . The granite has experienced strong magmatic differentiation with a selection of element enrichment and loss. The granite was formed within the intraplate tectonic environment nearby the continental plate boundary.Strong weathered process exists in the region and the yttrium-bearing heavy rare earth elements are enriched in the weathered crust. The ion-type REE mineralization has a close relationship with the high rare earth abundance of biotite adamellite,favorable structural conditions,topography and climatic conditions which are favorable for the weathering of the granite. |
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