Tibetan basement rocks near Amdo reveal "missing" Mesozoic tectonism along the Bangong suture, central Tibet

doi:10.1130/G22453.1

	Tibetan basement rocks near Amdo reveal "missing" Mesozoic tectonism along the Bangong suture, central Tibet
	Guynn, JH ; Kapp, P ; Pullen, A ; Heizier, M ; Gehrels, G ; Ding, L
刊名	GEOLOGY
	2006-06-01
卷号	34 期号:6 页码:505-508
关键词	Tibet Bangong Suture terrane accretion continental arcs continental collision
ISSN号	0091-7613
DOI	10.1130/G22453.1
文献子类	Article
英文摘要	The U-Pb and Ar-40/Ar-31 studies of a unique exposure of crystalline basement along the Jurassic-Early Cretaceous Bangong suture of central Tibet reveal previously unrecognized records of Mesozoic metamorphism, magmatism, and exhumation. The basement includes Cambrian and older orthogneisses that underwent amphibolite facies metamorphism coeval with extensive granitoid emplacement at 185-170 Ma. The basement cooled to similar to 300 degrees C by 165 Ma and was exhumed to upper crustal levels in the hanging wall of a south-directed thrust system during Early Cretaceous time. We attribute Jurassic metamorphism and magmatism to the development of a continental arc during Bangong Ocean subduction, and Early Cretaceous exhumation to northward continental underthrusting of the Lhasa terrane beneath the Qiangtang terrane. We speculate that a Jurassic arc extended regionally along the length of the Bangong suture, but in all other places in Tibet has been buried, either depositionally or structurally, beneath supracrustal assemblages.
WOS关键词	DONQIAO OPHIOLITE ; GEOTRAVERSE ; LHASA ; EVOLUTION ; GOLMUD ; PLATEAU ; COLLISION ; ZONE
WOS研究方向	Geology
语种	英语
出版者	GEOLOGICAL SOC AMERICA, INC
WOS记录号	WOS:000238274100023
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/66936]
专题	中国科学院地质与地球物理研究所
通讯作者	Guynn, JH
作者单位	1.Univ Arizona, Dept Geosci, Tucson, AZ 85721 USA 2.New Mexico Inst Min & Technol, New Mexico Bur Geol & Mineral Resources, Socorro, NM 87801 USA 3.Chinese Acad Sci, Inst Tibetan Plateau Res, Beijing 100029, Peoples R China 4.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Guynn, JH,Kapp, P,Pullen, A,et al. Tibetan basement rocks near Amdo reveal "missing" Mesozoic tectonism along the Bangong suture, central Tibet[J]. GEOLOGY,2006,34(6):505-508.
APA	Guynn, JH,Kapp, P,Pullen, A,Heizier, M,Gehrels, G,&Ding, L.(2006).Tibetan basement rocks near Amdo reveal "missing" Mesozoic tectonism along the Bangong suture, central Tibet.GEOLOGY,34(6),505-508.
MLA	Guynn, JH,et al."Tibetan basement rocks near Amdo reveal "missing" Mesozoic tectonism along the Bangong suture, central Tibet".GEOLOGY 34.6(2006):505-508.