摘要
大兴安岭中南段主要铜矿类型为斑岩—热液脉型 ,其成矿与燕山早期浅定位中酸性侵入体有成因联系。成矿时代集中于 180Ma～ 16 0Ma ,与中生代早期岩石圈伸展背景下幔源岩浆底侵—同熔—分异作用有关 ,由于其形成于区域大规模火山喷发之前 ,深部岩浆来不及进行彻底分异 ,对铜的大规模成矿不利。因此 ,寻找大型以上规模的铜矿床必须综合考虑岩浆条件和矿源层两个主要因素。本区大规模岩浆作用晚期 (燕山晚期 )形成的紫金山式铜矿应是寻找大型铜矿的重要目标。
The main Cu-deposits in the middle-southern part of Da Hinggan Mts.are porphry-hydrothermal vein type which genetically related to intermediate-acidic intrusions formed in early Yanshanian stage.The main metallogenic age is l80 Ma～160 Ma.The Cu-deposits were formed by mantle-derived magma underplating-lower crust syntexis-magma differentiation during the early Mesozoic lithosphere extension period.Because the Cu-deposits formed before regional intense volcanic eruption,which mean no enough time to form perfect differentiated magma,it seems unfavorable to form large scale copper deposits.To explore large copper deposits in this area,the combination of magmatism with Cu-bearing sources beds must be considered.The another target for large Cu-deposits is the Zijinshan style formed in the late stage of intense magmatism(late Yanshanian).
出处
《地质与勘探》
CAS
CSCD
北大核心
2000年第5期1-4,共4页
Geology and Exploration
关键词
斑岩--热液脉型
铜矿床
动力学背景
找矿潜力
porphry-hydrothermal vein type,Cu-deposits,geodynamic setting,Da Hinggan Mts.
