四川牦牛坪稀土矿床萤石Sr、Nd同位素对地幔成矿流体的指示意义  

Indicator of Fluorite Sr and Nd Isotope to Mantle-Derived Ore-Forming Fluids in Maoniuping REE Deposit, Sichuan Province, China

作　　者：许成[1] 黄智龙[1] 刘丛强[1] 漆亮[1] 李文博[1] 管涛[1] 

机构地区：[1]中国科学院地球化学研究所矿床地球化学开放研究实验室

出　　处：《地球科学（中国地质大学学报）》2003年第1期41-46,共6页Earth Science-Journal of China University of Geosciences

基　　金：国家攀登计划预选项目资助 (No .95 -预 -3 9)

摘　　要：萤石是四川牦牛坪稀土矿床主要的脉石矿物之一 ,其形成贯穿了整个稀土成矿过程 ,因此同位素的研究对探讨萤石和稀土成矿流体的来源具有重要的价值 .矿区 6件萤石样品的Sr、Nd同位素组成没有明显差异 .结合围岩 (碳酸岩 -正长岩 ,花岗岩 )同位素组成特征研究表明 ,不同颜色、来自不同矿石类型、具有不同REE类型的萤石为同源产物 ,稀土成矿流体来源于富集地幔 ,与区内碳酸岩Fluorite is main vein mineral in Maoniuping REE deposit, whose formation ran through the whole mineralization process. So the isotopic study plays an important role in probing the source of fluorite and REE ore-forming fluid. The Sr, Nd isotopic composition of 6 fluorite samples from Maoniuping orefield are similar. According to Sr, Nd isotopic data of the wall rocks ( carbonatite syenite, granite), it is shown: that different REE distribution fluorites from different colors and ore type are the products of the same source; REE ore forming fluids come from the enriched mantle and are closely related with magma action of carbonatite syenite.

关 键 词：四川 地幔 成矿流体 萤石 碳酸岩-正长岩 稀土矿床 锶同位素 钕同位素 岩浆活动 

分 类 号：P618.7[天文地球—矿床学] P597[天文地球—地质学]