Some show of ore in Dongsheng sandstone-type uranium deposit and prospecting signifeance in Ordos basin, Inner Mongolia

In the North Ordos basin the sandstone-type uranium deposits developing in the system of sandstone beds of sedimentary facies of braided river course in Midde Jurassic Series,at the same time it happens some show of ore:the alteration zone of chloritization,bleaching decoloration and carbonation of epigenetic alteration,which show of ore are immediate and indirect for uranium mineralizing process.In this area are understanding differences uranium mineralizating relation between to those alteration.This paper preliminary analyse these show of ore,the formation,the genesis,relationship between the uranium mineralization and prospecting signifeance.