福建上杭地区晚中生代花岗质岩体黑云母的地球化学特征及成因意义  

The Geochemical Characteristics of Biotite and Its Petrogenesis Implication in the Caixi Pluton and Sifang Pluton from Shanghang Area of Fujian Province

作　　者：赵希林[1] 毛建仁[1] 叶海敏[1] 许乃政[1] 胡青[1] 

机构地区：[1]南京地质矿产研究所,南京210016

出　　处：《矿物岩石地球化学通报》2009年第2期162-168,共7页Bulletin of Mineralogy, Petrology and Geochemistry

基　　金：中国地质调查局基础地质调查项目(1212010611805;300313000070)

摘　　要：用电子探针对福建省上杭地区才溪岩体、四方岩体中黑云母进行了分析。结果表明,才溪二长花岗岩中的黑云母介于高铁黑云母和高镁黑云母之间,而四方花岗闪长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,二者均落入壳幔混源区域,表明两个岩体都是壳-幔混源型花岗岩,但才溪花岗岩中的黑云母的MF值比四方花岗闪长岩中的黑云母的MF值低,显示后者形成过程中有更多幔源物质的加入,正因如此,使其成为紫金山矿床的含矿母岩。This paper analyzed the Zijinshan Cu-Au ore using Electron Probe mieroanalysis and discussed the petro- genic relationship among the deposits of Caixi pluton and Sifang pluton in the southwest of Fujian province. The results indicated that biotite in Caixi monzogranite varied from high-Fe biotite to high-Mg biotite, and biotite in Sifang granodiorite was categorized into high-Mg biotite. The compositions of the both biotite fell into crust-mantle zone on the relation diagram of the material sources of biotite implied that Caixi pluton and Sifang pluton belong to crustmantle granitoid. The MF value of Caixi granite biotite was lower than that of Sifang granodiorite biotite suggested that more mantle material were mingled during the formation of granodiorite. The increment of mantle material might be the genetic reason for Sifang pluton hosting Zijinshan ore deposit.

关 键 词：才溪岩体 四方岩体 黑云母 地球化学 

分 类 号：P578.959[天文地球—矿物学]