| 江西雅山富氟高磷花岗岩中的磷酸盐矿物及其成因意义 |
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| 引用本文： | 黄小龙,王汝成,等.江西雅山富氟高磷花岗岩中的磷酸盐矿物及其成因意义[J].地质论评,2001,47(5):542-550. |
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| 作者姓名： | 黄小龙 王汝成 |
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| 作者单位： | 1. 中国科学院广州地球化学研究所,510640;南京大学地球科学系内生金属成矿作用国家重点实验室,210093
2. 南京大学地球科学系内生金属成矿作用国家重点实验室,210093 |
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| 基金项目： | 国家自然科学基金(编号40025209,40073009,49673183,49632080) |
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| 摘 要： | 江西雅山黄玉锂云母花岗岩属典型的华南富氟高磷花岗岩（P2O5＝0．15％－0．55％），表现为富氟（F＝1．07％－2．04％），强过铝性（A／NKC＝1．26－1．60），具有很高的Li,Rb,Cs,Be,Nb,Ta含量和很低的Y、REE含量.磷锂铝石是雅山黄玉锂云母花岗岩中的主要磷酸盐矿物，其产出与否同体的Li,Rb,Cs含量密切相关；磷锂铝石和长石矿物都是雅山黄玉锂云母花岗岩中磷的主要贮体，并且相互之间呈互补关系，当出现磷锂铝石时，磷锂铝石为全岩磷的主要贡献者，当无磷锂铝石晶出时，长石矿物为全岩磷的主要贡献者，体系的强过铝性以及很低的REE，Y，Ca含量使得磷灰石，独居石，磷钇矿都难以达到饱和结晶，磷灰石为少量出现，并且大部分为晚期形成；独居石和磷钇矿都为极少出现，反映出雅山岩体演化过程中具有独居石，磷钇矿等稀土磷酸盐矿物的结晶分离，铍磷酸盐矿物－羟磷铍钙石的出现反映了雅山黄玉锂云母花岗岩存在岩浆期后的含Be,Ca热液流体的作用。
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| 关 键 词： | 磷锂铝石 磷灰石 铍磷酸盐 富氟高磷花岗岩 江西 成因 |
Phosphate Minerals from the Yashan F- and P-rich Granite in Yichun, Jiangxi Province: Genetic Implications |
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| HUANG Xiaolong,WANG Rucheng,CHEN Xiaoming,LIU Changshi Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Wushan,Guangzhou,State Key laboratory of Mineral Deposits Research.Phosphate Minerals from the Yashan F- and P-rich Granite in Yichun, Jiangxi Province: Genetic Implications[J].Geological Review,2001,47(5):542-550. |
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| Authors: | HUANG Xiaolong WANG Rucheng CHEN Xiaoming LIU Changshi Guangzhou Institute of Geochemistry Chinese Academy of Sciences Wushan Guangzhou State Key laboratory of Mineral Deposits Research |
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| Institution: | HUANG Xiaolong,WANG Rucheng,CHEN Xiaoming,LIU Changshi Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Wushan,Guangzhou,State Key laboratory of Mineral Deposits Research,Department of Earth Sciences,Nanjing University,Nanjing |
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| Abstract: | The Yashan topaz-lepidolite granite contains high phosphorus (P2O5 = 0. 15%~0. 55%) and high fluorine (F = 1. 07%~2. 04%), and is one of the representative F- a nd P-rich granites in South China. It is strongly peraluminous (A /NKC=1. 26~1. 60), very high in Li, Rb, Cs, Be, Nb and Ta and very low in Y and REE. Atnblygonite is the most important phosphorus mineral of the Yashan topaz-lepidolite granite. Whether the amblygonite occurs or not is closely related to the Li, Rb and Cs contents of the melt. Both amblygonite and feldspars are the main hosts of whole-rock phosphorus in the Yashan topaz-lepidolite granite. If amblygonite is present in the granite, the mineral is the main contributor of whole-rock phosphorus and feldspars are the subordinate contributor; if no amblygonite crystallizes out, feldspars will be the main contributor of whole-rock phosphorus. Apatite, monazite and xenotime are very difficult to attain saturation under conditions of the strong peraluminous natureand very low REE, Y and Ca contents. Apatite in granite is present in small amount and mostly crystallizes in the late magmatic stage. Monazite and xenotime are rare in the topaz-lepidolite granite , which implies that there occurred differentiation of the REE phosphatic minerals such as monazite and xenotime during the magmatic evolution of the Yashan batholith. The occurrence of hydroxylherderite suggests that Be- and Ca-bearing hydrothermal fluids operated in the Yashan granite in the postmagmatic stage. |
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| Keywords: | amblygonite apatite Be-bearing phosphate F- and P-rich granite Yashan Jiangxi |
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