贵州天柱大河边超大型重晶石矿床地质特征及成矿机制探讨

通过天柱大河边重晶石矿床的地质特征、矿石特征、矿物组分、矿物的形成途径、成矿古地理和成矿盆地沉积特征的研究分析,认为区内重晶石矿床形成于雪峰运动后,扬子陆块发生裂解形成雪峰期裂谷盆地,在裂谷盆地边缘常发生同生断裂,形成东西向次级断陷盆地,成矿盆地类型属地垫式盆地。成矿盆地可能形成于埃迪卡拉纪—寒武纪时期。区内重晶石矿床的分布、规模、形态及矿床特征严格受成矿盆地的制约,根据成矿盆地的矿体厚度、品位、结构构造特征划分为中心相、过渡相和边缘相。中心相:矿体厚度大,品位富,以块状、条带状、花斑状及结核状重晶石为主,分带明显;过渡相:矿体厚度一般不大,品位中等,以条带状、结核状重晶石为主,分带不明显;边缘相:矿体厚度薄,品位差,仅有结核状矿石,无分带。通过天柱大河成矿盆地的沉积相带和含矿岩系分布研究,认为区内重晶石矿床形成于雪峰运动后,成矿盆地类型属地垫式盆地,成矿盆地可能形成于埃迪卡拉纪寒武纪时期。区内重晶石矿床的分布、规模、形态及矿床特征严格受成矿盆地的制约,根据成矿盆地的矿体厚度、品位、结构构造特征划分为中心相、过渡相和边缘相,预测天柱贡溪向斜深部仍有较大找矿潜力,下步找矿应围绕古沉积盆地开展。

Geological characteristics and metallogenic mechanism of the Dahebian superlarge barite deposit in Tianzhu County, Guizhou Provine

Based on the research and analysis of the geological characteristics, ore characteristics, mineral composition, mineral formation pathways, metallogenic palaeogeography and sedimentary characteristics of the metallogenic basin, it is believed that the barite deposits in the area were formed in the snow after the peak movement, the Yangtze block cracked to form a rift basin in the Xuefeng period. Syngenetic faults often occur at the edge of the rift basin, forming an east-west secondary fault basin. The type of mineralization basin is a cushion basin. The mineralization basin may have formed in the Ediacaran-Cambrian period. The distribution, scale, morphology and characteristics of barite deposits in the area are strictly restricted by the mineralization basin. According to the thickness, grade, and structural characteristics of the mineralization basin, they are divided into central phase, transitional phase and marginal phase. Phase: The ore body is thick and rich in grade, mainly massive, banded, variegated and nodular barite, with obvious zoning; transition phase: the ore body is generally not thick, medium grade, and banded, Nodular barite is the main, and the zoning is not obvious; the marginal phase: the thickness of the ore body is thin, the grade is poor, only nodular ore, no zoning. Based on the study of the sedimentary facies belt and the distribution of the ore-bearing rock series in the Tianzhu Dahe Metallogenic Basin, this article believes that the barite deposits in the area were formed after the Xuefeng Movement. Dicara Period-Cambrian Period. The distribution, scale, shape and characteristics of barite deposits in the area are strictly restricted by the mineralization basin. According to the thickness, grade, structure and structure of the mineralization basin, they are divided into central facies, transitional facies and marginal facies. It is predicted that there is still great potential for prospecting in the deep part of the Tianzhu Gongxi syncline, and the next step of prospecting should be carried out around the paleo-sedimentary basin.