阿尔金中段塔什达坂韧性剪切带特征及其构造意义  

Characteristics of the Tashidaban Ductile shear zone in the Middle Section of Altun,and its Structural Significance

作　　者：李鹏霄 范天甲[1] 郭晓南[1] 孙中原 赵玉龙 王启 王延明 Li Peng-xiao;Fan Tian-jia;Guo Xiao-nan;Sun Zhong-yuan;Zhao Yu-long;Wang Qi;Wang Yan-ming(Second Geological Exploration Institute,Henan Bureau of Geo-exploration&Mineral Development Zhengzhou 450000)

机构地区：[1]河南省地质矿产勘查开发局第二地质勘查院

出　　处：《西部资源》2019年第6期50-52,共3页Western Resources

基　　金：新疆阿尔金塔什达坂一带三幅1∶5万区域地质矿产调查（项目编号K15-1-LQ11）

摘　　要：阿尔金中段塔什达坂韧性剪切带的研究发现,下盘贝壳滩组至少经历三期面理置换。且在韧性剪切带主期面理(Sn+2)形成之前已在阿尔金弧盆系结晶基底发生一期区域性的右旋剪切运动(Sn+1置换Sn+0)。对塔什达坂西二长花岗岩的LA-ICP-MS锆石U-Pb同位素分析,获得加权平均年龄为466.5±3.0Ma(MSWD=3.2),代表塔什达坂韧性剪切带形成下限。通过区域对比及结合前人的研究成果,认为性剪切带形成时代在中奥陶世至晚志留世之间。According to the research finding of the Tashidaban Ductile shear zone,Undergo at least three stages of surface displacement in heading side Beiketan Group.The results indicate that a regional dextral shear movement occurred in the Altun arc basin system crystal basement before the formation of ductile shear zone.By LA-ICP-MS zircon U-Pb dating analysis was carried Tashidaban west granite monzonite,acquisition its crystallization ages is 466.5±3.0Ma,represents the lower limit of Tashidaban ductile shear zone.Through regional comparison and combined with previous research results,It is believed that the formation age of sexual shear zone was between middle ordovician and late Silurian.

关 键 词：韧性变形 右旋剪切 锆石U-PB测年 塔什达坂 

分 类 号：P61[天文地球—矿床学]