横断山区花岗岩类中角闪石的标型特征及其成因意义  

PECULIARITIES AND GENETIC SIGNIFICANCE OF HORNBLENDE FROM GRANITE IN THE HENGDUANSAN REGION

作　　者：谢应雯[1] 张玉泉[1] 

机构地区：[1]中国科学院地球化学研究所

出　　处：《矿物学报》1990年第1期35-45,共11页Acta Mineralogica Sinica

摘　　要：本文研究了横断山区不同成因类型花岗岩中角闪石的化学成分、微量元素、稀土元素、晶胞参数和物理性质等特征。按化学成分对角闪石作了晶体化学成因分类。在三种不同成因类型角闪石中,其M值[M=Mg/(Mg+Fe^(2+))]各不相同;幔型M>0.7,壳幔型M=0.7—0.5,壳型M<0.5。The chemical compositions, trace elements,REE,unit cell parameters and physical properties of hornblendes from different genetic types of granite in the Hengduanshan Region have been studied in this paper. Based on their chemical compositions,the crystallochemical genetic classification of hornblendes has been established.Their M values [M=Mg/(Mg+Fe^(2+)]are ariable for the three different genetic types of hornblende: 0.7 for the mantle type,0.5—0.7 for the crust-mantle type,and 0.5 for the crust type.Each Of the types is distinct in trace element,REE,unit cell parameter,DTA and refractive index.Therefore, these peculiarities of hornblende can be used as the criteria to distinguish different genetic types of granite.

关 键 词：角闪石 花岗岩 矿物标型特征 横断山区 成因 化学成分 晶胞参数 稀土元素 

分 类 号：P578.955[天文地球—矿物学] P588.121[天文地球—地质学]