Geological Characteristics of Bauxite Deposits in Wuchuan-Zheng′an-Daozhen Area, Guizhou Province

The Wuchuan-Zheng′an-Daozhen bauxite metallogenic belt is an important bauxite concentration area in Guizhou, and even in China. Up to today, 2 super large scale deposits, 9 super scale deposits and 14 medium scale deposits have been explored in this belt, while the calculated resource reserve has increased to more than 700 million tons. According to palaeo-pollens, the ore-bearing rock series is Upper Carboniferous, and it is unconformable with overlying Middle Permian Liangshan Formation; according to fossils. The ore-bearing rock series are mainly composed of clay rock, bauxite rock ferriferous rock. The ore bodies coexist with bauxite and clay rocks, and distribute in middle-upper section of Upper Carboniferous Dazhuyuan Formation. The ore bodies emerge as bedded, parabedded, lenticular shapes and are consistent with the occurrence of their surrounding rocks. The natural types of the bauxite are hoary and grayish clastic-earthy bauxite, gray and dark gray dense bauxite and gray pisolitic bauxite. The ore textures include clastic texture, oolitic texture, mud grain texture, powder grain texture, clastic- pisolitic composite texture; the ore structures include massive structure and semi-earthy structure. The geological characteristics of bauxite deposits have been summarized basing on comprehensive studies of metallogenic epoch, rock types, profile types, thickness variation, floor limestone changes, ore bodies morphology, ore textures and ore structures in Wuchuan-Zheng′an-Daozhen bauxite metallogenic belt.