甘肃西部及邻区铀矿化特征和找矿方向

区内铀矿床分为6种类型:伟晶状白岗岩型、钠交代岩型、花岗岩型、火山岩型、碳硅泥岩型和砂岩型。本区铀矿主成矿期为海西期,其次为燕山期和中条期。矿床、矿点主要集中分布于冷龙岭、龙首山、潮水等6条成矿带。铀成矿主要受裂谷带及与之相邻的拱断带、夹持于花岗岩带之间的中新生代盆地、富碱的酸性侵入岩和火山岩、断裂构造、沉积相、氧化还原分带等因素的控制。潮水盆地、雅布赖盆地、巴丹吉林盆地等是找矿的主要远景区。

Minerogenetic charactetristic and exploration direction of uranium in western Gansu province and adjacent area

Uranium deposits in the area are divided to six types.(1)Pegma-alaskite type.(2)Albite-metasomatite type.(3)Granite type.(4)Volcanic rock type.(5)carbonaceous-siliceous mudstone type.(6)Sandstone type.Primary uranium metallogenic epoch is Hercynian Period,Yanshan Period and Zhongtiao Period are secondary in this area.Uranium deposits and occurrences concentrately distribute in six metallogenic belts of Lenglongling,Longshoushan,Chaoshui,etc..Uranium metallogenesis is controlled by factors as follows:rift valley and adjacent archgenesisfaulting belt,Meso-Cenozoic basin set between granite belts,alkali-riched acid instrusive rock and volcanic rock,fracture,sedimentary facies,redox zoning,etc.It is proposed that the basins of Chaoshui,Yabulai,Badanjilin are potential areas for metallogenesis.