湖南香花岭绿色萤石稀土元素特征
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摘要
湖南香花岭锡多金属矿床中发育的颜色丰富的萤石与成矿关系密切,其中紫红色萤石与香花石密切共生,绿色萤石与绿泥石、云母等共生。为研究该地区绿色萤石中的稀土元素及其特征,对采自湖南香花岭地区矽卡岩中的5件绿色萤石样品,使用LA-ICP-MS进行了稀土元素测试分析。结果表明:①该地区绿色萤石稀土元素含量丰富,w(ΣREE)为(298.95～3 135.42)×10~(-6),并且REE含量变化大,但却有相同的REE分配模式,即轻重稀土分馏相对明显,轻稀土富集、重稀土相对亏损;②绿色萤石表现出强烈的Eu负异常,在一定程度上反映了绿色萤石是在富含稀土元素的还原环境中成矿。
Xianghualing tin polymetallic deposit in Hunan Province developed abundant fluorites with different colors, which are closely related to metallic mineralization.The purple-red fluorite is closely associated with hsianghualite,and the green fluorite is closely associated with chlorite and mica.In order to study the rare earth elements and their characteristics in the green fluorites in this region,five samples are selected and taken from the skarn in the Xianghualing in Hunan Province The rare earth element(REE) contents of fluorite samples are analyzed by using LA-ICP-MS.The study results show that:①the green fluorite samples are rich in rare earth elements,w(ΣREE) is from 298.95×10~(-6) to 3 135.42×10~(-6) in different samples,although the REE concentrations changes greatly,these samples show similar REE distribution patterns,that is,the fractionations of light and heavy REEs are relatively obvious,enrich in the light REEs and deplete in the heavy REEs;②these green fluorites show strong Eu negative anomalies,which reflects that the green fluorites are crystalized in a reducing,REEs rich environment.
Xianghualing tin polymetallic deposit in Hunan Province developed abundant fluorites with different colors, which are closely related to metallic mineralization.The purple-red fluorite is closely associated with hsianghualite,and the green fluorite is closely associated with chlorite and mica.In order to study the rare earth elements and their characteristics in the green fluorites in this region,five samples are selected and taken from the skarn in the Xianghualing in Hunan Province The rare earth element(REE) contents of fluorite samples are analyzed by using LA-ICP-MS.The study results show that:①the green fluorite samples are rich in rare earth elements,w(ΣREE) is from 298.95×10~(-6) to 3 135.42×10~(-6) in different samples,although the REE concentrations changes greatly,these samples show similar REE distribution patterns,that is,the fractionations of light and heavy REEs are relatively obvious,enrich in the light REEs and deplete in the heavy REEs;②these green fluorites show strong Eu negative anomalies,which reflects that the green fluorites are crystalized in a reducing,REEs rich environment.
引文
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[2] 刘晓菲,袁顺达,吴胜华,等.湖南金船塘锡铋矿床矿物化学特征及其地质意义[J].中国地质,2012,39(6):1759-1777.
[3] 罗卫,李文光,周涛,等.湘南香花岭锡多金属矿田地质地球化学特征及成因探讨[J].地质调查与研究,2010,33(1):1-11.
[4] 王汝成,朱金初,张文兰,等.南岭地区钨锡花岗岩的成矿矿物学:概念与实例[J].高校地质学报,2008,14(4):485-495.
[5] 钟江临,李楚平.湖南香花岭矽卡岩型锡矿床地质特征及控矿因素分析[J].矿产与地质,2006,20(2):147-151.
[6] 彭建堂,胡瑞忠,漆亮,等.晴隆锑矿床中萤石的稀土元素特征及其指示意义[J].地质科学,2002,37(3):277-287.
[7] MINEYEV D A.Geochemical differentiation of rare-earth elements[J].Geochemistry,1963,12:1129-1149.
[8] MORGAN J W,WANDLESS G A.Rare earth element distribution in some hydrothermal minerals:evidence for crystallographic control[J].Geochimica et Cosmochimica Acta,1980,44:973-980.
[9] WOOD S A.The aqueous geochemistry of the rare-earth elements and yttrium:review of available low-temperature data for inorganic complexes and inorganic REE speciation of natural waters[J].Chemical Geology,1990,82:159-186.
[10] HASS J R,SHOCK E,SASSANI D C.Rare-earth elements in hydrothermal systems:estimates of standard partial molal thermodynamic properties of aqueous complex of the rare-earth elements at high pressures and temperatures[J].Geochimica et Cosmochimica Acta,1995,59:4329-4350.