贵州省铝土矿矿床特征分析

铝是地壳上最丰富的元素之一,要形成矿床必须有独特的地质背景和成矿条件,加里东晚期—海西早期运动产生裂陷背景下的大陆裂谷盆地,造就了黔中泻湖海盆、凯里海湾和渝南—黔北半封闭泻湖海湾的湿热古地理环境。使早古生代—晚古生代早期各类岩石接受风化剥蚀,达到前期的"排杂"使铝得到初步富集,搬运到泻湖海盆沉积和后期的"降硅沉铁"作用"脱颖而出"并沉积形成铝土矿矿床。中新生代的印支燕山—喜山运动造就的挤压背景—隆升背景,产生的前陆盆地—山间盆地,改变了成矿条件,不再形成铝土矿。铝土矿属沉积型矿床产于特定地层中,在省内有可能存在新的隐伏大型—超大型矿集区,在全国范围内更有可能存在相近大规模的铝土矿矿集区。

Analysis of bauxite characteristics in Guizhou Province

Aluminum is one of the most abundant elements in the earth''s crust. The formation of deposits must have a unique geological setting and metallogenic conditions. The continental rift basin under the background of rifting caused by the late Caledonian Hercynian movement has created the hydrothermal paleogeographic environment of the lagoon basin in the middle of Guizhou Province, Kaili Bay in Guizhou Province and the semi closed lagoon Bay in the south of Chongqing north of Guizhou Province. All kinds of rocks from early Paleozoic to early Late Paleozoic were weathered and denuded to reach the "discharge of impurities" in the early stage, therefore,aluminum was initially enriched, transported to the lagoon basin for deposition and later "siliceous matter moved out, iron was settled to the bottom" and "aluminum retained" and deposited to form bauxite deposits. The compression and uplifting background was created by the IndosinianYanshan Himalayan movement in the Mesozoic and Cenozoic, and the foreland basin intermontane basin, which changed the metallogenic conditions, could not form bauxite. Bauxite is a sedimentary type deposit, which occurs in a specific stratum. There may be new concealed large-scale and super large-scale ore concentration areas in Guizhou Province, and there may be similar large-scale bauxite concentration areas in China.