大兴安岭中生代两期成岩成矿作用的元素、同位素特征及其形成环境  

Two Stages of Mesozoic Lithogenesis and Mineralization in Daxing'anling Mountains

作　　者：祝洪臣[1] 张炯飞[1] 权恒[1] 

机构地区：[1]沈阳地质矿产研究所,辽宁沈阳110032

出　　处：《吉林大学学报（地球科学版）》2005年第4期436-442,共7页Journal of Jilin University：Earth Science Edition

基　　金：中国地质调查局项目(200110200018)

摘　　要：从成岩成矿方面论证了大兴安岭地区存在两期岩浆成矿作用,它们分别形成于早、中侏罗世和晚侏罗世早白垩世。早期构造岩浆成矿作用形成于造山环境,成岩、成矿物质来源较深,以幔源为主,成矿主岩为钙碱系列中酸性浅成侵入岩,主要矿种为Cu;晚期构造岩浆成矿作用形成于伸展环境,成岩、成矿物质来源较浅,以壳源为主,成矿主岩为酸性浅成侵入岩,主要矿种为Sn。From the perspective of lithogenesis and mineralization, two stages of lithogenesis and mineralization in Daxing＇anling Mountains have been studied. They were J1-J2 and J3-K1. The hydrothermal deposits which are mainly copper deposits formed in the early orogenic setting, and those mainly stannum deposits formed in late extending setting. The matter formed rocks and deposits in early stage mainly came from the earth mantle, and that in late stage was mainly from the crustal layer. The host rocks formed in early stage, which belong to calc-alkali series, were acid and neutral hypabyssal ones, and those formed in late stage were acid hypabyssal ones belonging to calc-alkali series.

关 键 词：大兴安岭 中生代 两期成岩成矿作用 

分 类 号：P617.23[天文地球—矿床学]