摘要
燕山地区金、银矿主要分布于十个金、银矿化集中区内.这些金银矿化集中区受中生代构造-岩浆带所控制,大部分金、银矿床与中生代中酸性岩浆活动有成因联系.区内主要金、银矿化类型有:岩浆热液硫化合物石英脉型、火山-次火山岩型金、银矿化与蚀变岩型、斑岩型、古砾岩型金矿化.据矿石混合铅多阶段模式、蚀变矿物的K-Ar法与Rb-Sr等时线法等直接同位素年代学方法结合地质推断法.确定了区内主要金、银矿形成于燕山期,少数几个金矿形成于吕梁期与海西—印支期;太古宙—早元古代、中元古代早期存在微弱金、银矿化,没有形成工业矿体.
More than one hundred gold and silver ore deposits are distributed in ten gold-silver mineralized districts in Yanshan area. Since the mineralized districts controlled by the Mesozoic tectonic-mag-matic zone,most gold and silver ore deposits are related to Mesozoic rnagmatic activity. The sulfide-bearing quartz vein-type, volcanic-type, altered rock-type, porphyry-type and palaeo-conglomerate-type gold and silver deposits were found in this area. The mineralization epochs are determined by lead isotope multi-stage model dating and altered mineral K-Ar and Rb-Sr dating. The results show that five regional mineralization periods occurred in Yanshan area (Archean to Early Proterozoic and Middle Proterozoic era,Luliangian stage, Variscian to Indosinian stage and Yanshanian stage). Most commercial gold and silver ore deposits were formed in Yanshanian stage, and a few gold oredeposits were formed in the other four periods.
出处
《地质科技情报》
CAS
CSCD
北大核心
1991年第3期49-55,共7页
Geological Science and Technology Information
