Intra-continental transpression and gneiss doming in an obliquely   convergent regime in SE Asia

doi:10.1016/j.jsg.2017.02.010

CORC > 北京大学 > 地球与空间科学学院

	Intra-continental transpression and gneiss doming in an obliquely convergent regime in SE Asia
	Zhang, Bo ; Chai, Zhi ; Yin, Cong Yuan ; Huang, Wen Tao ; Wang, Yang ; Zhang, Jin Jiang ; Wang, Xiao Xian ; Cao, Kai
刊名	JOURNAL OF STRUCTURAL GEOLOGY
	2017
关键词	Tengchong Dome Oblique collision Cenozoic Strike-slip shear zone Transpression RIVER SHEAR ZONE METAMORPHIC CORE COMPLEXES U-PB AGES AILAO SHAN WESTERN YUNNAN STRUCTURAL EVOLUTION TIBETAN PLATEAU CHINA DEFORMATION DOMES
DOI	10.1016/j.jsg.2017.02.010
英文摘要	The Tengchong terrane comprises a sequence of linear dome-like zones, cored by granite and migmatitic layers. These cores are mantled by predominantly gneiss and subordinate schist sequences, decreasing in deformation intensity outward from extensive mylonitization to weak mylonitization. The pre-doming deformation was characterized by the formation of large-scale top-to-the-east shearing (D1) in the gneiss terrane, locally preserved flat-lying foliation (S1), weak folding (F1) and emplacement of the Mangbang granite during the Cretaceous (114-104 Ma). The second stage of deformation (D2) consisted of map-scale east-verging folds (F2, dome amplification) and minor lateral strike-slip shear zones between the anticlines in the gneiss and migmatitic sequences. Extensive partial melting and emplacement of 67-30 Ma synkinematic granitoid bodies/veins occurred, leading to the emplacement of wedges of granite into the easterly directed F2 fold cores. These wedges formed kilometer-scale granitoid domes. The post-doming D3 deformation with transpression recorded strain partitioning with simple shear dominated high-strain zones along the Gaoligong and Nabang dextral lateral strike-slip shear zones (active during 30-11 Ma). Late transtensional deformation (D4) during cooling of the entire terrane involved the localized low-temperature Gaoligong west and east detachment faults that controlled the late exhumation of the Gaoligong metamorphic zone (since 10 Ma). Our structural observations, combined with previous studies, suggest that this style of doming is a representative type of intra-continental deformation in the Cenozoic during the oblique India-Asia collision. The actual dome shapes reflect formation of antiforms during compression-dominated transpression, prior to localized strike-slip shearing, in the accommodation belt around the Eastern Himalayan Syntaxis. Vertical exhumation of crustal material by contractional doming played an important role in absorbing the vast majority of the internal deformation of crustal fragments during oblique collision. (C) 2017 Elsevier Ltd. All rights reserved.; Excellent young scientist foundation of the National Science Foundation of China (NSFC) [41422206]; NSFC [41272217]; SCI(E); ARTICLE; 48-70; 97
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/474183]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Zhang, Bo,Chai, Zhi,Yin, Cong Yuan,et al. Intra-continental transpression and gneiss doming in an obliquely convergent regime in SE Asia[J]. JOURNAL OF STRUCTURAL GEOLOGY,2017.
APA	Zhang, Bo.,Chai, Zhi.,Yin, Cong Yuan.,Huang, Wen Tao.,Wang, Yang.,...&Cao, Kai.(2017).Intra-continental transpression and gneiss doming in an obliquely convergent regime in SE Asia.JOURNAL OF STRUCTURAL GEOLOGY.
MLA	Zhang, Bo,et al."Intra-continental transpression and gneiss doming in an obliquely convergent regime in SE Asia".JOURNAL OF STRUCTURAL GEOLOGY (2017).