摘要
康古尔构造带位于东天山觉罗塔格造山带北部,是构建中亚造山带晚古生代增生造山过程的关键。系统建立康古尔构造带的变形样式和变形条件,对进一步理解其构造背景和动力学机制具有重要意义。本文基于康古尔构造带红丘陵段构造解析、糜棱岩显微构造和石英c轴组构分析,厘定出2期构造变形:D1期为南北向挤压韧性剪切,变形温度为500~650℃;D2期为右行剪切,变形温度小于350℃。综合已有区域构造热年代学数据分析认为,D1期变形时间为294~280 Ma,形成于康古尔有限洋盆闭合后的中天山地块与吐哈地块南北向碰撞挤压过程,D2期右行剪切发生于276~242 Ma的后碰撞陆内缩短环境。本研究可为康古尔构造带晚古生代构造演化过程提供重要支撑。
The Kanggur tectonic zone is located in the north of the Jueluotage orogenic belt in the East Tianshan,which is the key to reconstruct the Late Paleozoic accretionary orogenic process of the Central Asian orogenic belt.The establishment of the deformation style and conditions of the Kangur tectonic belt is of great significance for further understanding its tectonic background and dynamic mechanism.Based on the structural analysis,mylonite microstructure and quartz c-axis fabric analysis of the Kanggur tectonic zone in Hongqiuling area,two stages of tectonic deformation are determined.Of them,stage D1 is a north-south compression ductile shear with the deformation temperature of about 500~650℃,and stage D2 is right-lateral shear with deformation temperature less than 350℃.The analysis of the existing regional tectonic thermochronological data suggests that the deformation time of the D1 period is 294~280 Ma,during the north-south collision and compression process of the Central Tianshan block and the Tuha block after the Kanggur limited ocean basin closed.The horizontal shear occurred in a post-collision intracontinental shortening environment during 276~242 Ma,which provides a constraint for the Late Paleozoic tectonic evolution of the Kangur tectonic zone.
作者
张海迪
罗彦军
郭伟立
张丹丹
康磊
刘生荣
任广利
ZHANG Haidi;LUO Yanjun;GUO Weili;ZHANG Dandan;KANG Lei;LIU Shengrong;REN Guangli(Xi’an Center of Geological Survey,Research Center for Orogenic Geology,Geological Survey of China,Xi'an,Shaanxi 710054)
出处
《地质与勘探》
CAS
CSCD
北大核心
2021年第6期1354-1365,共12页
Geology and Exploration
基金
中国地质调查局区域地质调查项目“东天山喀拉塔格-雅满苏一带戈壁荒漠浅覆盖区地质填图”(编号:DD20179607)
国家重点研发计划“深地资源勘查开采”重点专项“天山-阿尔泰增生造山带大宗矿产资源基地深部探测技术示范”(编号:2018YFC0604000)联合资助。
关键词
构造变形
韧性剪切带
显微构造
石英组构
红丘陵段
康古尔构造带
东天山
tectonic deformation
ductile shear zone
microstructure
quartz fabric
Hongqiuling area
Kanggur tectonic zone
East Tianshan
