摘要:
依据在原划埃连卡特群花岗片麻岩中获得(1970±47)Ma(锆石U-Pb法)同位素年龄数据,结合岩石学、岩石地球化学及区域地层对比,从中解体出喀啦喀什岩群。通过岩石学、岩石地球化学、构造特征和变形变质特征、同位素年龄及成矿专属性研究,认为铁克里克断隆构造基底具双重构造基底特征,喀啦喀什岩群组成结晶基底,埃连卡特岩群、塞拉加兹塔格岩群组成过渡基底;蓟县纪的博查特塔格组、苏玛兰组及青白口纪的苏库勒克组及震旦系组成沉积盖层。喀啦喀什岩群对铁、铜、金多金属矿成矿有利。该成果对铁克里克断隆结晶基底的组成、发展和演化研究具有重要意义。
Abstract:
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.
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