新疆阿舍勒铜锌块状硫化物矿床成矿条件和成矿特点

阿舍勒铜锌矿床是一个典型的火山岩型块状硫化物矿床。大陆边缘裂谷带是矿床形成的大地构造环境。早中泥盆世火山活动形成了含矿的双峰式火山岩套。矿床产于近喷发间歇期的石英角斑质角砾凝灰岩中，受火山洼地和同生断裂控制。矿床有双层结构，下部有强烈的围岩蚀变分带，矿体内有矿化分带。成矿以喷气－沉积作用为主，经历了后期变质改造、岩浆热液叠加和表生氧化作用，具有岩浆热液与裂谷海水对流循环成矿模式

METALLOGENIC CONDITIONS AND CHARACTERISTICS OF THE ASHELE MASSIVE Cu-Zn SULFIDE DEPOSIT

The Ashele Cu-Zn deposit is one of the typical massive sulfide ones hosted in volcanics. It is located in the rift of continental margin. The bimodel volcanic suites were formed in the Early-Middle Dervonian volcanic activity. The deposit occurs in quartz keratophyric breccia and tuffs formed in intermittent period,and controlled by volcanic depression and synchronous fractures. It shows a double-layed structure with extensive alteration zoning at bottom of ore bodies and mineralization zoning within ore bodies. Predominantly featured by exhalation-sedimentation, it was reformed by later metamorphism,superimposed by process of magmatic hydrothermal fluids and supergenously oxidized. The metallogenic model is characterized by convection and circulation of magmatic fluid and sea water.