宁夏贺兰石矿地质特征及成因分析

Ningxia Helan quarry geological characteristics and genetic analysis

通过分析贺兰石矿的地质特征和演化过程,认为滨海-浅海相沉积为矿层的形成奠定了物质基础,后期的区域浅变质作用为矿层的形成提供了外部条件.该矿层赋存于中元古界长城系黄旗口组石英岩、石英砂岩夹砂质板岩地层中,岩性为粉砂质(砂质)泥质板岩,其原岩为滨海-浅海相沉积的粉砂质泥岩,后期经过区域热液活动使岩石发生了轻微的变质.

It is considered that deposition to seam from marina and shallow marine is material foundation, and regional metamorphism for formation of shallow seam provides external conditions through the analysis of Helan quarry geological characteristics and evolution processes. The ore-body is in Huangqikou group strata, Middle Proterozoic Changcheng System,which is mainly composed of quartzite, quartz sandstone, sandy-slate and silt-slate. Lithology is silty(sandy) argillite, the original rock littoral- shallow marine facies of silty mudstone, slight deterioration of the rock occurred in the late of area hydrothermal activity.