中国北方超大型热水沉积硫化物矿床基本特征及形成条件研究  

MAJOR CHARACTERISTICS AND FORMATION CONDITIONS OF SUPER LARGE SEDIMENTARY HYDROTHERMAL SULFIDE ORE DEPOSITS IN NORTH CHINA

作　　者：李英[1] 祁思敬[1] 马国良[1] 张振飞[1] 

机构地区：[1]西安工程学院资源与材料工程系,陕西西安710054

出　　处：《西安工程学院学报》1999年第4期19-24,共6页Journal of Xi'an Engineering University

基　　金：国家攀登项目

摘　　要：中国北方超大型热水沉积硫化物矿床产于秦岭中段和阴山西段两区，主要类型为多金属及硫铁矿床。地质地球化学特征与世界中元古界和古生界（ 主要为泥盆系） 中的ＳＥＤＥＸ 硫化物矿床基本相同：成矿时代为１－４ ～１－２ Ｇａ 和０－４ ～０－３ Ｇａ， 均产于克拉通边缘盆地中；矿体延长达千米以上，具多层性特征；富硫化物矿石为块状条带状，矿物组合简单，有显著分带性；硫同位素组成为海相硫酸盐型，铅同位素为混合程度较高的均匀性铅等。研究表明，中国北方的ＳＥＤＥＸ 矿床与世界同类矿床有相似的形成条件，即形成于大陆边缘演化中的破裂晚期至聚合初期，受地热异常岩浆侵入冷却退变质作用系统控制。同生期热水沉积成矿形成了矿床的基本规模。后生期成矿元素的活化富集及矿体的加厚作用，对于形成巨大规模和高品位矿石的超大型矿床是重要的。Super large type sedimentary hydrothermal sulfide ore deposits, located in middle Qinling and west Yinshan mountains, has shown the multi metal and pyrite type deposit The deposits are shown sililay geo geochemistry characteristics to SEDEX sulfide deposits in middle Proterozoic and Paleeozoic Era(Devonain period) in the world, i e , ore forming age were 1 4～1 2 Ga and 0 4～0 3 Ga ore bodies show more than 1 000 m long and multi layered distribution, the ore of sulfide rich show massive banded structure; mineral assemblage is simple and zonation, sulfur isotopic composition is marine sulfate type, Pb isotope composition shows homogeneous Pb mixed to a certain extent The studies indicate that the SEDEX ore deposit in north China shows similar ore forming conditions to the same type deposits in the world, that is to say, these deposits were formed late period of fracturing to initial period of convergent during continental marginal evoluation, these deposit were controlled by the system consisted of geothermal anomaly magma intrusion cooling demetamorphic processes Further research has shown that the basic scale of the deposit was formed in syngenetic sedimentary hydrothermal period, activity and richment of ore forming elements as well as thicked process of orebodies were formed in epigenetic period These process are very important condition to form super large deposit that were massive orebodies and a great quantity of high grade ore [

关 键 词：超大型矿床 大陆边缘盆地 热历史 硫化物矿床 

分 类 号：P618.202[天文地球—矿床学]