Volume 2 · Issue 6 (2025)
Geological characteristics and prospecting potential of Andranovato bauxite in Madagascar
Liu Yang1, Gong Cheng2, Weijian Zhou1,2, Dan Wang1
1 Hunan Vocational College of Engineering, Changsha, Hunan 410151, China
2 Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring（Ministry of Education), School of Geosciences and Info-physics, Central South University, Changsha 410083, China
Corresponding Author: Weijian Zhou (476341099@qq.com)
Abstract: Madagascar is rich and underdeveloped in bauxite, the Andranovato bauxite is a laterite-type bauxite. The primary rock is aluminum-rich quartz syenite. The ore body occurs in the Neogene strata, covering the plateau, with irregular shape and mostly controlled by topography. There are four layers of red soil, bauxite, semi-weathered layer and bedrock. The ore has high quartz content and is earthen, sandy, honeycomb, nodular, bean shaped, etc., which is cemented by aluminum-bearing minerals under leaching action. The main ore minerals have been altered into bauxite, kaolinite, goethite, and hematite. The aluminum-rich protolith, hot and humid climate, favorable topographic features, good drainage system and plant desilication provide favorable conditions for the Andranovato bauxite mineralization.
Keywords: Madagascar; Bauxite; Geological Characteristics; Metallogenic Regularities
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