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固体有机物质保留了金属矿床成矿过程的重要信息。本文以黔西南烂泥沟和戈塘两个典型金矿床为例,系统研究了其中的固体有机物质的有机岩石学特征,并探讨了固体有机质与金矿化的关系。烂泥沟金矿固体有机质由原生煤系有机质和异源焦沥青组成。煤系有机质为原生有机质,与成岩黄铁矿关系密切,没有直接参与热液成矿作用。焦沥青沿石英脉壁粘附或在细脉和纹层中呈带状分布,是热液成矿期原油热液蚀变的产物,原油搬运Au,遭受热液蚀变并参与热化学还原,导致Au 的释放和沉淀。戈塘金矿床中有机质主要是煤系有机质碎屑,与上覆的含煤层有成因联系。这些有机质在热液过程中遭受热液蚀变,还原硫酸盐,为硫化物的沉淀提供还原硫。
Solid organic matter retains important information on metallogenic processes. Taking the two typical gold deposits of Lannigou and Getang in southwestern Guizhou Province as an example, the organic petrological characteristics of the solid organic matter in the study were systematically studied and the relationship between the solid organic matter and gold mineralization was discussed. Lan Ngau Gold Mine solid organic matter from the primary coal organic matter and heterogenous coke bitumen composition. Coal-bearing organic matter is a native organic matter, which is closely related to diagenetic pyrite and has no direct hydrothermal mineralization. The coke bitumen adheres along the quartz vein wall or zonally distributes in veins and veins. It is the product of hydrothermal alteration of hydrothermal mineralization. Crude oil is transported by Au and is subjected to hydrothermal alteration and is involved in thermochemical reduction. Lead to the release of Au and precipitation. The organic matter in the Getang gold deposit is mainly coal-bearing organic matter, which is related to the overlying coal seam. These organic species are subject to hydrothermal alteration during hydrothermal processes, reducing sulfate to provide reducing sulfur for sulfide precipitation.