Triassic tectonics of the Ailaoshan Belt (SW China): Early Triassic collision between the South China and Indochina Blocks, and Middle Triassic intracontinental shearing

doi:10.1016/j.tecto.2016.06.015

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	Triassic tectonics of the Ailaoshan Belt (SW China): Early Triassic collision between the South China and Indochina Blocks, and Middle Triassic intracontinental shearing
	Faure, Michel 1; Lin, Wei 2; Chu, Yang 2; Lepvrier, Claude 3
刊名	TECTONOPHYSICS
	2016-06-30
卷号	683 页码:27-42
关键词	Continental collision Ophiolitic melange Triassic tectonics Indosinian orogeny South China Indochina
DOI	10.1016/j.tecto.2016.06.015
文献子类	Article
英文摘要	In SE Yunnan, the Ailaoshan Belt has been extensively studied for the ductile shearing coeval with the left-lateral Cenozoic activity of the Red River fault. However, the Late Triassic unconformity of the continental red beds upon metamorphic and ductilely deformed rocks demonstrates that the Ailaoshan Belt was already built up by Early Mesozoic tectonics. From West to East, the belt is subdivided into Western, Central, Eastern Ailaoshan, and Jinping zones. The Western Ailaoshan and Central Ailaoshan zones correspond to a Carboniferous-Permian magmatic arc, and an ophiolitic melange, respectively. The Eastern Ailaoshan, and the Jinping zones consist of deformed Proterozoic basement and Paleozoic to Early Triassic sedimentary cover series both belonging to the South China Block. This litho-tectonic zonation indicates that the Ailaoshan Belt developed through a SW directed subduction followed by the collision between Indochina and South China blocks. Crustal thickening triggered per-aluminous magmatism dated at ca 247-240 Ma. Field and microscope-scale top-to-the-NE ductile shearing observed only in the pre-Late Triassic formations, but never in Late Triassic or younger formations, complies with this geodynamic polarity. Furthermore, the late collisional two-mica granitoids and felsic per-aluminous volcanites record a ductile deformation that argues for a continuing crustal shearing deformation after the Early Triassic collision up to the Middle Triassic. Therefore, a two-stage tectonic evolution accounts well for the documented structural and magmatic features. The Triassic architecture of the Ailaoshan Belt, and its geodynamic evolution, correlate well to the South and North with the North Vietnam orogens and the Jinshajiang Belt, respectively. (C) 2016 Elsevier B.V. All rights reserved.
WOS关键词	ZIRCON U-PB ; ARC/BACK-ARC ASSEMBLAGES ; PALEO-TETHYS OROGEN ; PLATE IGNEOUS ROCKS ; LEFT-LATERAL SHEAR ; TRUONG SON BELT ; NORTHERN VIETNAM ; NORTHEASTERN VIETNAM ; SE ASIA ; INDOSINIAN OROGENY
WOS研究方向	Geochemistry & Geophysics
语种	英语
WOS记录号	WOS:000382343700003
资助机构	"Strategic Priority Research Program" of the Chinese Academy of Science(XDB03010802) ; "Strategic Priority Research Program" of the Chinese Academy of Science(XDB03010802) ; National Natural Science Foundation of China(41472193 ; National Natural Science Foundation of China(41472193 ; 41225009 ; 41225009 ; 41202079) ; 41202079) ; "Strategic Priority Research Program" of the Chinese Academy of Science(XDB03010802) ; "Strategic Priority Research Program" of the Chinese Academy of Science(XDB03010802) ; National Natural Science Foundation of China(41472193 ; National Natural Science Foundation of China(41472193 ; 41225009 ; 41225009 ; 41202079) ; 41202079)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/53327]
专题	地质与地球物理研究所_岩石圈演化国家重点实验室
作者单位	1.Univ Orleans, Inst Sci Terre Orleans, CNRS, UMR 7327, Campus Geosci,1A Rue Ferollerie, F-45071 Orleans 2, France 2.Chinese Acad Sci, State Key Lab Lithospher Evolut, Inst Geol & Geophys, Beijing, Peoples R China 3.Univ Paris 06, Inst Sci Terre Paris, CNRS, UMR 7193, F-75252 Paris 5, France
推荐引用方式 GB/T 7714	Faure, Michel,Lin, Wei,Chu, Yang,et al. Triassic tectonics of the Ailaoshan Belt (SW China): Early Triassic collision between the South China and Indochina Blocks, and Middle Triassic intracontinental shearing[J]. TECTONOPHYSICS,2016,683:27-42.
APA	Faure, Michel,Lin, Wei,Chu, Yang,&Lepvrier, Claude.(2016).Triassic tectonics of the Ailaoshan Belt (SW China): Early Triassic collision between the South China and Indochina Blocks, and Middle Triassic intracontinental shearing.TECTONOPHYSICS,683,27-42.
MLA	Faure, Michel,et al."Triassic tectonics of the Ailaoshan Belt (SW China): Early Triassic collision between the South China and Indochina Blocks, and Middle Triassic intracontinental shearing".TECTONOPHYSICS 683(2016):27-42.