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野外地质和室内光学显微镜、EPMA和XRD分析研究表明,贵州烂泥沟金矿矿石中存在4种不同成因的层状硅酸盐矿物(云母类),即碎屑成因白云母、成岩或变质成因水云母、基质热液蚀变交代成因伊利石和热液脉状充填成因绢云母。后两类矿物与金成矿过程中的热液蚀变有关,其中热液脉状充填绢云母形成于第四成矿阶段,其39Ar4-0Ar阶段升温测年法获得坪年龄为(194.6±2)Ma,代表了成矿末期热液蚀变的年龄,即成矿时代的上限。
Field geology and indoor optical microscopy, EPMA and XRD analysis indicate that there are four kinds of layered silicate minerals (micas) of different origin in the Lannigou gold deposit in Guizhou Province, namely, clastic origin muscovite, diagenetic or metamorphic origin water Mica, matrix hydrothermal alteration metasomatism illite and hydrothermal veins filling sericite. The latter two types of minerals are related to the hydrothermal alteration during gold mineralization. Hydrothermal vein-filling sericite was formed in the fourth metallogenic stage, and the 39Ar4-0Ar stage temperature dating obtained a mean age of (194.6 ± 2) Ma, representing the age of hydrothermal alteration at the end of the metallogenesis, the upper limit of the metallogenic epoch.