关键词: 铝土矿　矿床特征　成矿规律　找矿方向　几内亚

Abstract: Guinea is endowed with the world's richest and highest-quality bauxite resources and is currently the main supplier of bauxite to China. Studying the characteristics,mineralization regularity,and prospecting directions of bauxite in Guinea is of great significance for promoting the participation of Chinese enterprises in the exploration and development of bauxite resources in Guinea and ensuring the continuous supply of bauxite for China.Based on the summary of bauxite resource endowment and typical deposit characteristics in Guinea,this paper discusses the deposit types,spatial and temporal distribu tion of bauxite in Guinea,and divides the mineralization zones in detail.The results show that:① Guinea has the largest proven bauxite reserves in the world,mainly concentrated in the Boke region in the west,the Kogon-Tomini River and Fatala-Fria min eralization area,with good resource quality.② The deposits are classified into three types:lateritic,sedimentary-lateritic and accumulation types,with lateritic type being the dominant one.③ All bauxite occurs in laterite weathering crust,and the distri bution and deposit characteristics of bauxite are closely related to the topography and underlying ore-forming parent rocks.④ The main ore-forming parent rocks are Mesozoic basalt and gabbro,followed by Neoproterozoic and Paleozoic aluminium-rich argillite and silty mudstone etc.⑤ Mineralization began in the Late Cretaceous and continued to the Early Pleistocene at the latest,and the Middle to Late Miocene is the main metallogenic period.According to ore-forming conditions,metallogenic regu larity and development environment,the bauxite ore-forming unit in Guinea is further divided into three secondary mineraliza tion belts:the western Bové Basin,the central Fouta-Djallon Plateau,and the eastern Dinguiraye,as well as 12 mineralization areas (prospective potential areas).

Key words: bauxite,deposit characteristics,metallogenic regularity,prospecting direction,Guinea