伊尔曼德金矿位于吐拉苏盆地奥陶系灰岩与中上泥盆统火山-沉积岩间的不整合面，赋矿围岩为蚀变凝灰岩、岩屑凝灰岩和凝灰质砂岩，矿石为热液角砾岩。矿石角砾成分复杂，胶结物为石英、黄铁矿和白铁矿。据矿石中脉体的切穿关系，将成矿作用划分为：硅化、黄铁矿化和绢云母化阶段（I）；角砾化、硅化、黄铁矿-白铁矿阶段（II）及重晶石-方解石阶段（III）。两期流体作用叠加形成高级泥化带的过程对应着金矿成矿过程。在研究伊尔曼德金矿成矿作用的基础上，建立新的成矿模式。%Yelmand gold deposit locates in Tulasu volcanic-sedimentary basin.The orebody lies on the unconformity be-tween the basement and Middle-Late Devonian volcanic-sedimentary strata. The wall-rocks are tuff, lithic tuff and tuffa-ceous sandstone.The orebody consists of hydrothermal breccias which were cemented by quartz and sulfides. Fluid evolu-tion can be divided into three stages:silicification,pyritization and sericitization (stage I);brecciation,silicification,and crystallization of pyrite and marcasite (II);crystallization of barite and calcite (III).The advanced argillization resulted from the combination of two-stage fluid,and this process plays a primary role in the formation of gold deposit.We estab-lished a metallogenic model for the Yelmand gold deposit based on previous studies and our new data.
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