大兴安岭中南段燕山期两类不同成矿花岗岩类角闪石的化学成分及其成岩成矿意义  

MINERAL CHEMISTRY OF AMPHIBOLES FROM GRANITES RELATED TO DIFFERENT MINERALIZATION AND OCCURRED IN TWO STAGES OF YENSHANINA PERIOD IN SOUTH-MIDDLEPART OF THE DAXINGAN MOUNTAINS AND ITS GENETIC AND METALLOGENIC SIGNIFICANCE

作　　者：吕志成[1] 段国正[2] 郝立波[2] 李殿超[2] 

机构地区：[1]中国科学院地球化学研究所矿床地球化学开放实验室,贵州贵阳550002 [2]吉林大学,吉林长春130026

出　　处：《矿物岩石》2003年第1期5-10,共6页Mineralogy and Petrology

基　　金：教育部博士点基金 (No.970 1870 1)项目 ;国家攀登计划预选项目 (95 -预 -3 9) ;国家杰出科学家基金 (批准号 :4962 5 3 0 4)项目

摘　　要：大兴安岭中南段燕山期两类不同成矿花岗岩类岩体中角闪石主要为钙质角闪石。角闪石的主化学成分表明本区燕山早期早阶段与铜成矿有关的花岗岩类主要为壳幔型花岗岩 :而与 Sn多金属成矿有关的花岗岩类可能为壳源成因。燕山期两个不同期次不同成矿系列的花岗岩中角闪石的化学成分明显不同 ,燕山早期早阶段与铜成矿有关的斜长花岗斑岩其角闪石相对以富镁、硅贫铁为特征 ,M*变化于 0 .2 4～ 0 .5 4之间 ,平均值为0 .37;燕山晚期早阶段与锡、铅、锌多金属矿化有关的花岗斑岩类岩体角闪石以富铁贫硅、镁为特征。角闪石的 M* 为 0 .10～ 0 .2 7,平均值为 0 .19。角闪石的化学成分及不同成矿岩体的微量元素和同位素特征是区分区内两类不同成矿岩体的有效判别标志。The mineralogical composition study on amphibole in the Yenshanian granite in the south middle part of the Da Hinggan Mountains revealed that the amphibole belongs to calcic amphibole.The major composition of amphibole from early stage of early Yanshanian period and from early stage of late Yanshanian period show that their host rocks were mainly crust mantle type and crust type respectively.Major compositions of amphibole in granites were different and related to different mineralization.Amphibole in Cu mineralization related granite in early stage of early Yenshanian Period is characterized by high content of MgO, SiO 2, and its M * ranges from 0.24 to 0.54(0.37 on average). And the amphibole in Sn polymetal mineralization related granite in the early stage of late Yenshanian Period is rich in ΣFeO and poor in MgO and SiO 2,and its M * ranges from 0.10 to 0.27(0.19 on average). The major compositions of amphibole in the granites, trace element composition and isotopic composition of granites were effective index to distinguish different metallogenic granitic bodies.

关 键 词：角闪石 化学成分 成岩成矿意义 花岗岩 大兴安岭中南段 

分 类 号：P578.955[天文地球—矿物学]