闽西南地区燕山晚期花岗岩黑云母特征及成因意义

本文通过黑云母的电子探针方法测试，分析闽西南地区才溪岩体、四方岩体及罗卜岭岩体中黑云母的地球化学特征及其成因意义。测试结果表明，才溪二长花岗岩中的黑云母为高铁黑云母，而四方花岗闪长岩及罗卜岭花岗闪长斑岩中的黑云母为高镁黑云母，在由黑云母成分确定的物质来源图上，它们均落入壳-幔混合源区域，表明其成因类型都是壳-幔混源型花岗岩，但随着形成时代的逐渐变新，其物质组成成分中幔源组分逐渐增多。

Characteristics of biotites and their petrogenesis implication of late Yanshanian granites in southwestern Fujian province

Through the electron probe microanalysis of biotites from Caixi, Sifang and Luoboling plutons in southwestern Fujian Province, the paper discusses their geochemical characteristics and petrogenesis implication. The results indicate that the biotite in Caixi monz- ogranite can be classified into high-Fe type, and the biotite in Sifang and Luoboling granodiorites into high-Mg type. On the material source discrimination diagram, the compositions of biotites are plotted in the crust-mantle zone, implying that all of the plutons belong to the crust-mantle granitoids and that with the ages of the granitoids becoming younger more mantle constituents were mingled in their materials compositions during the formation of granitoids.