Discussion of the Sedimentary Characters of Alluvial-proluvial Fan of Bauxite Series,Jiujialu Formation in Central Guizhou

By systemic study the alluvial-proluvial fan of Bauxite series,Jiujialu formation in middle Guizhou,it′s thought that this sediment is the continental deposit accumulated by the alluvial-proluvial process and lake process in the negative relief.The alluvial-proluvial fan is a normal kind of sediment of the alluvial-proluvial facies.Most of the big scale alumina deposit in the central Guizhou formed of the scalloped and sheetlike.