【摘要】 大兴安岭中南段花岗岩中黑云母的矿物学和地球化学特征研究表明 ,海西晚期花岗岩岩体黑云母 Mg高 Fe2 +低 ,Mg原子数 >0 .6 ,Fe2 +原子数 <1.1,而燕山期 γ5 2 - 3岩体黑云母 Mg原子数 <0 .6 ,Fe2 + 原子数 >1.1,燕山晚期 γ5 3 - 1 岩体黑云母 Mg原子数 <0 .4,Fe2 + 原子数 >1.9,本区黑云母成分特征介于华南二成因系列之间 ,兼具二系列的某些特点 ,表明本区花岗岩的壳幔混源特点。本区南部地区与 W,Sn成矿有关的 γ5 2 - 3岩体中黑云母以富 Si,Fe贫 Mg为特点 ,微量元素富 Sn,平均质量分数为 92 .5× 10 - 6 ,而北区与Cu,Pb,Zn成矿有关的γ5 2 - 3 岩体黑云母中 Si O2 质量分数较 Sn成矿岩体为低 ,微量元素Sn平均为 49.4× 10 - 6 ,而 Cu,Pb,Zn高出岩体质量分数 5～ 10倍 ,且方差大 ,明显较富 Sn花岗岩为高 ,与 Sn多金属矿床成矿有关的γ5 3 - 1 花岗岩黑云母中 Sn,Cu,Pb,Zn质量分数均高出相应岩体质量分数的 5～ 10倍更多还原

【Abstract】 The mineralogical and geochemical studies of biotite occurring in the granite in the south middle part of the Great Xing’an Mountains, show that the biotite in the late Hercynian granite,is characterized by high content of Mg and low content of Fe 2+ .While the biotite in the late middle Yenshanian granite are both characterized by high content of Fe 2+ and low content of Mg. The chemical composition of biotite in the granite in the region is similar to the biotite in the Nanling granite series and to the biotite in the Middle low reaches of the Yangtze river granite series,and manifests the granite in the region is mantle crust mixing type. In the southern part of the region,the biotite in the late middle Yanshanian granite related to the W,Sn mineralization is rich in Si and Fe and poor in Mg.While in the northern part of the region,the content of SiO 2 in the biotite in the late middle Yanshanian granite related to the Cu,Pb,Zn mineralization is lower than the granite,and the contents of Cu,Pb,Zn are as much as 5~10 times higher than granite.更多还原