Abstract
Bauxite rocks of the pre-Jurassic complex of the Urmano- Archinskaya area of the West Siberian Plate are considered, which were formed mainly due to proluvial-deluvial-alluvial redeposition of weathering products into karst traps. The parent rocks could be volcanic rock of intermediate composition and clay deposits, drilled by wells into erosion-tectonic uplift of the basement to the north-east of the study area. The reservoir properties and alumina enrichment of study sediments are due to the leaching by hydrothermal solutions of bauxite rocks during deep-burial diagenesis.
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