黔西南烂泥沟金矿构造控矿与成矿模拟实验

Tectonic ore-controlling and ore-forming research of Lannigou gold deposit in SW Guizhou:constraint from experiment simulations and scanning electron microscope

贵州西南部烂泥沟金矿属大型断裂破碎带控制的卡林型金矿。运用成矿模拟实验装置进行构造控矿模拟实验表明,在高温高压构造条件下,围岩产生了变形和破裂及成矿物质活化、迁移和聚集的过程。对实验前后样品进行背散射电子成像分析研究和选区成分分析研究,分析对比微观组织,研究主要赋金矿物迁移、富集过程,了解和解释了金的迁移和富集机制。研究表明,在该金矿围岩中,三轴高温高压作用可使其中与金相关的硅酸盐矿物、含As黄铁矿(主要的载金矿物)向围岩所产生的裂隙处迁移,富集。

The Lannigou gold deposit in southwestern Guizhou Province is a Carlin-type-gold deposit controlled by large typical fault.Carriying on the ore-forming simulations and experiments involving in ore-controlling tectonics,we have searched on wall-rock deformation and fracture,metallogenic material activation,mobilization,precipitation and accumulation under high T and P conditions caused by tectonic movement.Before and after experiments,the analyses of back scattered electron imaging and selection composition are made to observe mineral micro textures in order to explore the mobilization and enrichment of Au-rich minerals.The silicates and some minerals（enriched in Fe,S and As） of the host rocks would migrate to wall-rock fractures and subsequently precipitate.