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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
The mineralogical and geochemical characteristics of biotite from the granites in the central-southern section of the Greater Xing’an Mountains show that the biotite Mg in the Hercynian granites is high in Fe2 +, Mg +0.6, Fe2 + +1.1, and Yanshanian γ5 2 - 3 rock biotite Mg atoms <0.6, Fe2 + atoms> 1.1, Yanshanian γ5 3 - 1 rock biotite Mg atoms <0.4, Fe2 + atoms> 1.9, the region The characteristics of biotite are between two families of South China, which have some characteristics of two series, indicating the crust-mantle mixed source characteristics of granites in this area. In the southern part of this area, the biotite in the γ5 2 - 3 rock associated with the W and Sn mineralization is characterized by rich Si and Fe poor Mg, trace elements rich in Sn with an average mass fraction of 92.5 × 10 -6, and north The mass fraction of Si O2 in the biotite of γ5 2 - 3 rock associated with the mineralization of Cu, Pb and Zn is lower than that of the Sn ore - bearing rock mass, the average trace element Sn is 49.4 × 10 - 6, while the contents of Cu, Pb and Zn Which is 5 to 10 times higher than the mass fraction of rock mass, and the variance is large, which is obviously higher than that of Sn-rich granite. The mass fraction of Sn, Cu, Pb and Zn in γ5 3 - 1 granite biotite related to the metallogenesis of Sn polymetallic deposit Higher than the corresponding rock mass fraction of 5 to 10 times