几内亚红土型铝土矿床地质特征

Geological characteristics of red clay type bauxite deposits in Guinea

几内亚铝土矿资源丰富,并具有品位高,富铝、高铁、低硅、易采、易选之特点,属富含三水铝石的红土型铝土矿。硅铝铁风化壳是本区的含矿岩系,主要矿石类型为蜂窝状、土状和块状铝土矿。矿体多赋存于山体顶部和坡度适中的斜坡上,地形平坦地段和沟谷部位矿体质量差或无矿体。几内亚属于湿热多雨和干湿交替的热带气候,为红土型铝土矿的形成提供了有利条件。广泛分布的富铝基性岩石是铝土矿的母岩,也是形成铝土矿的基本前提。

Guinea is rich in mineral resources of bauxites, the bauxite resources are characterized by wide distribution, high grade, high content of aluminum and iron, low content of silicon, easy exploitation and beneficiation, belonging to hydrargillite-enriched red clay type bauxites. The ore-bearing rock formations in the area are the weathered eluvial type sili- con, aluminum and iron weathered crusts, the main ore types are of honeycomb, earthy and massive structures. The ore bodies mostly lie at the topes and moderate-gradient slopes of mountainous areas, whereas in the flat grounds, ditches and valleys, the ore bodies are of low grade or even absent. The tropical climate in Guinea is characterized by damp and hot, great rainfall and alternation of arid and wet climates, providing beneficial conditions for the formation of red clay type bauxites. The wide distributed high aluminum basic rocks are the mother rocks of bauxites and are also the principle premise for the for- mation of bauxites. The appropriate geological and geographical conditions in Guinea are favorable to the formation of the world exceptional ultra-large scale red clay type bauxite deposits.