贵州某萤石矿地质特征及矿床成因

Geological features and origin of a fluorite deposit,Guizhou

贵州贞丰县新近开发的某萤石矿具有较大规模,萤石矿体形态呈现为层状、似层状,局部呈透镜状产出,矿体走向北西,长约3200 m,倾向与背斜轴两翼近似平行,沿倾向延深约200 m,矿体厚度2.00~6.90 m。文章通过对区域地质、矿区地质、矿体地质特征的研究和分析,认为该萤石矿的主要成矿要素为沉积盆地、灰岩、火山喷发活动、褶皱,在各成矿要素的共同作用下,形成了二叠系上统龙潭组第一段(P3l1)和二叠系中统茅口组(P2m)之间的构造蚀变体(Sbt),发育出了多种矿物的矿体,含萤石矿、锑矿、金矿等,是一处沉积改造型萤石矿。这些矿体的共同特点是沿断裂、背斜平行分布,以背斜轴部为中心,两侧延伸,为矿山的找矿工作指明了方向。

A fluorite mine newly developed has a large scale of resources in Zhenfeng,Guizhou Province. The fluorite ore body morphology is layered,similar layered,and partially lenticular. The ore body goes northwest,about 3200 m long,and tends to be approximately parallel with the anticline axis. The inclination is about 200 m along the trend. The thickness of the ore body is 2.00 m ~6.90 m. This paper studies and analyzes the regional geology,deposit geology and ore body geological features. It is believed that the main ore-forming elements of this fluorite deposit are sedimentary basins,limestones,volcanic eruptions,and folds. The tectonic-alteration layer (Sbt) between the Longtan Group of Upper Permian (P3l1) and the Maokou Group of Middle Permian (P2m) developed a variety of mineral ore bodies,including fluorite,antimony and gold. It is a sedimentary-modified fluorite deposit. The same features of these ore bodies are that they are distributed along the fault and the anticline in parallel,with the anticline axis as the center and extending on both sides,which indicates the direction of the mine’s prospecting work.