产子坪铀矿床的成矿构造特点与矿床成因

ON THE CHARACTERISTICS OF METALLOTECT FEATURES AND ORIGIN OF CHANZIPING URANIUM DEPOSIT

The deposit is a big one.It is one of the representative uranium deposits which lie in the Lower Cambrian Qingxi Formation in China,Chiefly composed of black shale formation.The mineral- ization is largely controlled by the U-rich strata and bedding-plane faults.The former is the source of ore and ore-bearing wallrock;the latter controls the distributions of ore bodies,and is the source of force for remobilization,and mineralization of uranium and other metallogenctic elements.The forma- tion of this deposit approximately undergoes the following 4 stages; 1.Preliminary enrichment of sedimentary uranium source layer in the Qingxi Formation; 2.Further uranium enrichment during the deformation and metamorphism of strata;3.Formation of hydrothermal(thermal water)uranium deposit(main metallogenetic epoch)due to dynamic differenta- tion and thermodybnamic metamorphism;4.Formation of rich multiple ore bodies due to the secondary leaching and enrichment.Then,the deposit,which Contains strata-bound features.becomes a polygenet- ic compound uranium deposit.These characteristics may be used as the rules for searching for uranium deposits of this type.