气候变化领域集成服务门户(CCPortal): Paleotethyan evolution of the Indochina Block as deduced from granites in northern Laos

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DOI	10.1016/j.gr.2015.11.011
	Paleotethyan evolution of the Indochina Block as deduced from granites in northern Laos
	Wang, Shifeng; Mo, Yasi; Wang, Chao; Ye, Peisheng
通讯作者	Wang, SF (通讯作者)
发表日期	2016
ISSN	1342-937X
EISSN	1878-0571
起始页码	183
结束页码	196
卷号	38
英文摘要	The Paleotethyan evolution of the Southeast Asia has become better understood in recent years. Questions remain, however, over the role of the Dien Bien Phu Suture Zone in the evolution of the Indochina Block and whether the Song Ma Suture represents the boundary between the Indochina Block and the South China Block. Granitoid geochronological and geochemical data obtained in northern Laos provide new information vis-a-vis these arguments. Zircon U-Pb ages togetherwith whole rock, trace and rare earth element data from 27 granitic rocks from five complexes allow us to conclude that these granites are typical of I-type Indosinian volcanic arc granites. However, the 234-256 Ma I-type granites mismatch the initiation age obtained from the ductile shear zone of the Dien Bien Phu Fault, thus repudiating the existence of the Dien Bien Phu Suture Zone. This then implies that the Qamdo-Simao and Indochina blocks were united. The geochemical and geochronological data further suggest that the main crust in the Indochina Block formed in the Late Paleoproterozoic to Early Mesoproterozoic, much later than the Archean crustal formation age identified east of the SongMa Suture. Moreover, the 440-404Ma and 234-256 Ma I-type granites suggest that the boundary between Indochina and South China should be the Jinsha River Suture-SongMaSuture-KontumMassif, instead of the Jinsha River Suture-Song Chay Suture. Finally, the Emeishan basalt and granite complexes both formpart of the South China tectonic units subducting westward under the Qamdo-Simao and Indochina blocks. (C) 2015 The Authors. Published by Elsevier B. V. on behalf of International Association for Gondwana Research.
关键词	U-PB GEOCHRONOLOGY TRUONG SON BELT BIEN-PHU FAULT PLUME-LITHOSPHERE INTERACTION EMEISHAN FLOOD BASALTS PLATE TECTONIC MODEL RIVER SHEAR ZONE A-TYPE GRANITES CENTRAL VIETNAM SOUTHEAST-ASIA
英文关键词	Granite; Laos; Zircon U-Pb age; Lu-Hf; Whole-rock major; Trace and rare earth elements
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000397872600012
来源期刊	GONDWANA RESEARCH
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/258656
推荐引用方式 GB/T 7714	Wang, Shifeng,Mo, Yasi,Wang, Chao,et al. Paleotethyan evolution of the Indochina Block as deduced from granites in northern Laos[J]. 中国科学院青藏高原研究所,2016,38.
APA	Wang, Shifeng,Mo, Yasi,Wang, Chao,&Ye, Peisheng.(2016).Paleotethyan evolution of the Indochina Block as deduced from granites in northern Laos.GONDWANA RESEARCH,38.
MLA	Wang, Shifeng,et al."Paleotethyan evolution of the Indochina Block as deduced from granites in northern Laos".GONDWANA RESEARCH 38(2016).