桂林理工大学学报2018，Vol.38Issue(4)：712-717,6.DOI:10.3969/j.issn.1674-9057.2018.04.012
念青唐古拉山西缘拉布普韧性剪切带的厘定及其地质意义
Determination and geological significance of the Labupu ductile shear zone in western Nyainqentanglha range
摘要
Abstract
Based on the field geological investigation and microstructural observation,a NEE-striking sinistral detached ductile shear zone was determined in the Labupu area of western margin of Nyainqentanglha range, which dips NNW wards with angles of 30° - 55°. The Labupu ductile shear zone,about 30 km in length and 2 km in width,consists of several strong deformational zones and weak deformational domains. There occur many typical macroscopic structures and microstructures occured,such as mylonite series,foliation,stretching lineation, S - C fabrics,rotated porphyroclast system and domino structure in the strong deformational zone. The LAICP- MS zircon U - Pb age of the monzonitic granite involved in the shear zone is 13. 096 ± 0. 072 Ma,which represents the crystallization age of the monzonitic granite in the western margin of the Nyainqentanglha range. It also indicates that the shear deformation occurred after that. The macroscopic and microcosmic structures of the ductile shear zone,zircon U - Pb chronology,as well as regional geological data,suggest that it is a structural feature of the western NNS. The shear zone was created by extensional tectonics of Tibet Plateau in the Late Cenozoic, which was formed after Miocene. Thus,the determination of the Labupu ductile shear zone provides constraints on the Late Cenozoic tectonic evolution and Plateau uplift of the Nyainqentanglha area.关键词
拉布普韧性剪切带/晚新生代/伸展构造/念青唐古拉山Key words
Labupu ductile shear zone/Late Cenozoic/extensional tectonics/Nyainqentanglha range!分类
天文与地球科学引用本文复制引用
黄永高,李应栩,韩飞,贾小川,杨学俊,严刚,杨青松..念青唐古拉山西缘拉布普韧性剪切带的厘定及其地质意义[J].桂林理工大学学报,2018,38(4):712-717,6.基金项目
中国地质调查局项目(DD20160015) （DD20160015）
