On pediplanation influence on the bauxite boulder-like ores formation at North Viet-Nam

Abstract

As the analysis of boulder-like bauxite ores revealed, they are products of repeated redeposition of substance of eroded bauxite layers. A considerable volume of essentially clayey matter had been formed due to limestones dissolving, weathered alumosilicates desintegration from the roof of primary bauxite layers, repeated grinding of allitic and bauxite formations themselves, the clay mass forms the cement in the bauxite boulder-like ores. The ore deposits are located mostly within the limits of anticlinal structures. Schemes in the paper illustrate the pediplanation progress and the present-day topography formation.