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新疆阿尔泰可可托海3号伟晶岩脉磷灰石矿物中稀土元素“四分组效应”及其意义
引用本文:张辉,刘丛强.新疆阿尔泰可可托海3号伟晶岩脉磷灰石矿物中稀土元素“四分组效应”及其意义[J].地球化学,2001,30(4):323-334.
作者姓名:张辉  刘丛强
作者单位:中国科学院地球化学研究所
基金项目:国家杰出青年科学基金(49625304),国家攀登计划项目95预39,国家自然科学基金49903002
摘    要:新疆阿尔泰可可托海3号伟晶岩脉磷灰石矿物中稀土元素(REE)和其他微量元素的ICP-MS分析结果表明,Y/Ho,Zr/Hf和Nb/Ta明显偏离球粒陨石中对应的比值,并存在显著的REE“四分组效应”,REE“四分组效应”量化特征参数TE3,4主要与Y/Ho,Nb/Ta分异程度有关,与δEu负异常演化程度相一致,锰铝榴石也呈现REE“四分组效应”和Y/Ho,Nb/Ta显著分异,指示REE“四分组效应”是形成伟晶岩熔体的一个基本特征,并不是由富LREE矿物(如独居石)和富HREE矿物(如四榴子石)结晶引起的残余熔体REE含量的异常变化,其机制可能是富F,B和P的过铝质窝本与含水流体间相互作用,REE在流体相/熔体相的分配受温度,压力和流体相组成复合控制的综合结果。

关 键 词:伟晶岩  磷灰石  元素分异  新疆维吾尔自治区  稀土元素“四分组效应”  形成机制  存在方式  岩浆演化
文章编号:0379-1726(2001)04-0323-12
修稿时间:2000年10月16

Tetrad effect of REE in apatites from pegmatite No. 3, Altay, Xinjiang and its implications
ZHANG Hui,LIU Cong-qiang.Tetrad effect of REE in apatites from pegmatite No. 3, Altay, Xinjiang and its implications[J].Geochimica,2001,30(4):323-334.
Authors:ZHANG Hui  LIU Cong-qiang
Abstract:REE and other trace elements content s in apatites from pegmatite No.3,Al tay,determined by ICP-MS,indicate that there exist REE tetrad effect in apatites,and ratios of Y /H o,Zr /Hf and Nb /Ta in apatites are contrasting difference from those i n chondrite.The degrees of tetrad effect(TE 3,4 )correlate linearly with Y /Ho and Nb /Ta,and its variety is consistent with the developing trend of depleti on degree of europium.For there are a lso REE tetrad effect and significant fr actionation of Y-Ho,Zr-Hf and Nb-Ta in spessartites(paragenous with apatites in the same zones),it is put forward that the REE tetrad effect is one of the fundamental features in pegmatite-forming melts,and its mechanism of REE tetra d effect is due to the interaction of F,B,P-richened peraluminous melt /magmatic fluid,and cannot be caused by the crystallization of monazite(LREE-rich mineral)and spessartite(HREE-rich mineral).That is,the partition behaviors of individual REEs and isovalent trace elements in fluid /melt are controlled comprehensively by temperature,pressure and the composition of fluid phase.
Keywords:REE tetrad effect  pegmatite  apati tes  fractionation of element  Xinj iang Uygur Zizhiqu
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