广西岑溪和村稀土矿床粘土矿物组成及成矿机制
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摘要
广西岑溪地区出露众多花岗岩体,形成了大量离子吸附型稀土矿床,前人研究结果表明其与粘土矿物有关。为了真正了解粘土矿物对这种类型稀土矿床成因的影响,用X射线衍射方法,对广西岑溪和村稀土矿床的粘土矿物组成进行研究,分析表明粘土矿物主要是高岭石,其次是伊利石和蒙脱石,同时,粘土矿物的含量和稀土品位高低具有一定的相关性。这类稀土矿床的成因机制是含矿岩体经过风化作用后以离子形式溶于水中的稀土元素被粘土矿物吸附并在风化层底部富集而成矿。
Many granite bodies have been exposed in the Cenxi City of Guangxi,and a large number of REE deposits have been formed.Previous studies have shown that they are related to clay minerals.In order to truly understand the influence of clay minerals on the genesis of this type of rare earth deposit,the X-ray diffraction method is used to study the clay mineral composition of Hecun rare earth deposits in Cenx City of Guangxi.The results show that clay minerals are mainly kaolinite,followed by illite and montmorillonite.At the same time,there is a certain correlation between clay mineral content and rare earth grade.The genetic mechanism of this kind of rare earth deposit is:the ore bearing granite is weathered and the rare earth elements dissolved in water in the form of ions are adsorbed by clay minerals and enriched at the bottom of the weathering layer.
Many granite bodies have been exposed in the Cenxi City of Guangxi,and a large number of REE deposits have been formed.Previous studies have shown that they are related to clay minerals.In order to truly understand the influence of clay minerals on the genesis of this type of rare earth deposit,the X-ray diffraction method is used to study the clay mineral composition of Hecun rare earth deposits in Cenx City of Guangxi.The results show that clay minerals are mainly kaolinite,followed by illite and montmorillonite.At the same time,there is a certain correlation between clay mineral content and rare earth grade.The genetic mechanism of this kind of rare earth deposit is:the ore bearing granite is weathered and the rare earth elements dissolved in water in the form of ions are adsorbed by clay minerals and enriched at the bottom of the weathering layer.
引文
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[3]贺伦燕,王似男.我国南方离子吸附型稀土矿[J].稀土,1989(1):39-44.
[4]潘华.广西云开地区风化壳离子吸附型稀土矿矿床特征及成矿模式[J].南方国土资源,2011(9):37-40.
[5]须藤俊男.粘土矿物学[M].北京:地质出版社,1981.
[6]易发成,田煦.苏州阳山高岭石矿物学特征及其形成途径[J].西南工学院学报,1995,10(4):23-30.
[7]陈德潜,吴静淑.离子吸附型稀土矿床的成矿机制[J].中国稀土学报,1990,8(2):175-179.
[8]李社宏,潘新奎,缪秉魁,等.离子吸附型稀土矿床成矿规律及找矿潜力:以广西姑婆山和广东新丰地区为例[J].矿物学报,2011,31(增刊1):253-255.
[9]张祖海.华南风化壳离子吸附型稀土矿床[J].地质找矿论丛,1990,5(1):57-71.
[10]郑作平.桂南桂东南地区离子吸附型稀土矿床的地球化学及实验研究[D].贵阳:中国科学院地球化学研究所,1991.
[11]王一先.中国稀土矿化花岗岩的地球化学特征[M]//中国科学院地球化学研究所年报,1987.
[12]陈宏毅,张波,何辉,等.华南离子吸附型稀土矿床成矿规律与找矿方向初探[J].南方国土资源,2012(12):26-28.