摘要
次火山岩型矿床的成矿作用受次火山活动控制。铜多金属矿床与中酸性岩类有成因联系,银多金属矿床与酸性岩类关系更密切。中酸性火山—次火山岩Cu的丰度值较高,酸性岩类Pb、Zn、Ag丰度值高,各自代表原始岩浆为富含矿源质的。稀土元素表明,与铜矿有关的岩浆为同熔型,而与银多金属矿有关的为地壳重熔型。矿床是在中低温、低盐度条件下形成的。其成矿时代为燕山早期晚阶段或燕山晚期。
The metallogenesis of sub-volcanic deposits is controlled by sub-volcanic activities.The copper polymetallic deposits are genetically related to intermediate-acidic rocks,and the silver polymetallic deposits are more closely related to acidic rocks.The abundance of copper in intermediate-acidic volcanic rocks and sub-volcanic rocks is relatively high,but the abundances of Pb, Zn,Ag in acidic rocks are high,representing metallogenetic elements rich inoriginal magmas.The study of REE shows that the magma type related to copper deposits is syntectic type,and that to silver polymetallic deposits is mainly re-melting type.The deposits were formed under medium-low temperature and low salinity. The metallogenic times are the late stage of early Yanshanian period or late Yanshanian period with the dating data of 78 Ma～147 Ma.
出处
《地质与勘探》
CAS
CSCD
北大核心
2000年第1期10-13,共4页
Geology and Exploration
关键词
次火山岩
银矿床
地球化学
铜矿床
矿床成矿
sub-volcanic rocks,copper silver deposits,geochemistry,eastern China
