不同来源两个系列Li-F花岗岩的同位素组成区别  

Isotopic components of two series of Li-F granite derived from different magma sources

作　　者：王联魁[1] 王慧芬[1] 黄智龙[2] 

机构地区：[1]中国科学院广州地球化学研究所,广东广州510640 [2]中国科学院地球化学研究所,贵州贵阳550002

出　　处：《华南地质与矿产》2002年第3期58-65,共8页Geology and Mineral Resources of South China

基　　金：国家自然科学基金资助项目"花岗岩液态分离的研究"

摘　　要：根据地质和地球化学特点 ,特别是同位素组成 ,将Li-F花岗岩划分为浅源南岭系列 (系列Ⅰ )和深源长江系列 (系列Ⅱ )。系列Ⅰ的δO18>10‰ ,ISr>0 710 0 ,εNd(t) <- 6 ,在2 0 7Pb/ 2 0 4Pb- 2 0 6Pb/ 2 0 4Pb铅同位素构造图上位于上地壳线附近 ;系列Ⅱ的δ18O <10‰ ,ISr<0 710 0 ,εNd(t) >- 6 ,在2 0 7Pb/ 2 0 4Pb - 2 0 6Pb/ 2 0 4铅同位素构造图上位于地幔线与造山带线之间。说明浅源南岭系列Li-F花岗岩物质来源比较浅 ,以上地壳 (再循环地壳 )物质为主 ,而深源长江系列Li-F花岗岩物质来源比较深 ,以地幔、下地壳和造山带 (原生地壳 )According to their geological and geochemical features,especially the oxygen isotopic components,the Li F granites in China can be divided into hypabyssal Nanling series(Series Ⅰ) with δ 18 O>10‰,I Sr > 0.7100 , ε Nd ( t )<-6 and locating near the upper crust evolution line on the 207 Pb/ 204 Pb 206 Pb/ 204 Pb plot;and abyssal Yangtze series(SeriesⅡ) with δ 18 O<10‰,I Sr <0.7100, ε Nd ( t )>-6 and locating between the mantle evolution line and the orogenic evolution line on the 207 Pb/ 204 Pb 206 Pb/ 204 Pb plot,which suggests that the hypabyssal Nanling series Li F granite was derived mainly from upper crust(recycling)materials and the abyssal Yangtze series Li F granite was derived mainly from the mantle,lower crust and orogenic belt(primary crust).

关 键 词：Li-F花岗岩 同位素地球化学 成因 稀有元素花岗岩 地幔 下地壳 适山带 

分 类 号：P588.121[天文地球—岩石学]