摘要
青山金矿床位于商丹缝合带及勉略缝合带之间的旬阳热水盆地边缘，矿体呈脉状、囊状、透镜状、似层状等产出，主要位于上泥盆统九里坪组黑色碳质板岩与下石炭统界河街组碳酸盐岩的接触带中。金矿石类型有原生的含金黄铁矿一菱铁矿型及铁帽型，矿石中主要金属矿物为菱铁矿、黄铁矿、褐铁矿、金，成矿元素以Au-Ag-As—Sb—Ba组合为特征。成矿流体氢、氧同位素值具“氧漂移”现象，成矿流体温度介于160～220℃，流体包裹体成分显示成矿流体为重碳酸盐-氯化钠型地下热卤水。由此推断，该矿床为泥盆系矿源层中的金在中生代受雨水来源的地下热泉水长期循环改造、富集、沉淀，在构造网络中、在浅成低温条件下形成的热泉型金矿床。
Qingshan gold deposit occurred in the hydrothermal basin margin which between the Shangdan suture zone and Mianlue suture zone. The orebodys occur as vein, cystic,lenticular and stratoid bed in the carbonaceous slate and carbonatite, which located above the disconformity between Jiuliping Group and Jiehejie Group. The ores are divided into primary gold bearing pyrite-siderite type and gossan type. The main metallic mineral in the ore are siderite, pyrite, limonite and gold. The element association is Au-Ag-As-Sb-Ba. Hydrogen and oxygen isotope values of the ore-forming fluids have the phenomenon of ＂oxygen drift＂. The metallogenic temperature ranges from 160 -220 ℃ ,the ore-forming fluid is underground thermal brine which is bicarbonate-sodium chloride type. It is suggested that Qingshan gold deposit is hot spring type, which is formed by the Mesozoic chronically repeated recycling in the Devonian System. The underground hot brine became progressively rich in gold and deposited in structure network.
出处
《黄金科学技术》
2009年第5期16-23,共8页
Gold Science and Technology
基金
成都理工大学科技服务项目(编号:HQ0013)资助
关键词
地球化学
地质特征
矿床成因
青山金矿
陕西省
Geochemical
Geological characteristics
Genesis of deposit
Qingshan gold deposit
Shaanxi province
