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地质学报  2001 

伊犁京希―伊尔曼德金矿床的热液蚀变及成矿流体演化特征

, PP. 518-526

Keywords: 热液蚀变蚀变分带成矿流体演化金矿床矿床地质空间分布

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Abstract:

京希-伊尔曼德金矿床的热液蚀变在空间上有明显的分带性,中心蚀变带以强烈的硅化为主,典型的蚀变矿物组合为石英或玉髓和地开石,中间带为高级泥化带,以地开石-高岭石-石英或玉髓为特征;外带为以蒙脱石-高岭石-伊利石-其他粘土矿物等矿物组合为主的泥化带,蚀变强度和矿物组合的分带性是温度、压力和化学梯度的反映,是流体在不断的水或流体-岩石反应和成分交换的产物。该矿床成矿流体演化过程为:早期酸性(pH=2-3)含矿流体在沿断裂上升过程中,受围岩灰岩中的流体(pH为中性)缓冲,在其进入高渗透性的碎屑岩层时,流速和水-岩石或流休-岩石反应大大加快,并在与大气降水的混合作用下,pH值逐步升高(3-5),产生了流体的温度及成分梯度,在温度和压力迅速下降的条件下,金及蚀变矿物沉淀、结晶生长,形成了蚀变空间分带,中心带保存完好的多孔状石英和地开石等高级泥化矿物组合说明该矿床是高硫化热液体系作用下的产物。

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