Crystal Basement Feature of Tiekelike Fault-Uplift at Southern Margin of Tarim Basin

Based on (1970±47) Ma (zircon U-Pb) isotopes age data obtained from the granite-gneiss,combining petrology,rock geochemistry and region stratigraphic correlation,we dismember Kalakashi rock-group from formerly Ailiankate group.Studying on petrology,rock geochemistry,structural feature,deformation metamorphic feature,isotopes age and metallogenetic specialization,it is suggested that the basement of Tiekelike fault-uplift is a double structure basement,and the crystal basement is formed by Kalakashi rock-group,the transitional basement is formed by Ailiankate rock-group and Sailajiacit age rock-group; the Sedimentary cover is composed of Bochatetage formation and Sumalan formation of the Jixianian system,Sukuleke formation of the Qingbaikou system,and strata of Sinian system.Kalakashi rock-group is conducive to the formation of iron-copper-gold polymetallic ore deposits.This result has important significant for researching on development and evolution of Tiekelike fault-uplift's crystal basement.