气候变化领域集成服务门户(CCPortal): Tibetan basement rocks near Amdo reveal missing Mesozoic tectonism along the Bangong suture, central Tibet

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DOI	10.1130/G22453.1
	Tibetan basement rocks near Amdo reveal missing Mesozoic tectonism along the Bangong suture, central Tibet
	Guynn, Jerome H.; Kapp, Paul; Pullen, Alex; Heizier, Matthew; Gehrels, George; Ding, Lin
发表日期	2006
ISSN	0091-7613
EISSN	1943-2682
起始页码	505
结束页码	508
卷号	34 期号:6
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.
关键词	DONQIAO OPHIOLITE LHASA GEOTRAVERSE EVOLUTION COLLISION PLATEAU ZONE
英文关键词	Tibet; Bangong Suture; terrane accretion; continental arcs; continental collision
语种	英语
WOS研究方向	Geology
WOS类目	Geology
WOS记录号	WOS:000238274100023
来源期刊	GEOLOGY
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/257438
推荐引用方式 GB/T 7714	Guynn, Jerome H.,Kapp, Paul,Pullen, Alex,et al. Tibetan basement rocks near Amdo reveal missing Mesozoic tectonism along the Bangong suture, central Tibet[J]. 中国科学院青藏高原研究所,2006,34(6).
APA	Guynn, Jerome H.,Kapp, Paul,Pullen, Alex,Heizier, Matthew,Gehrels, George,&Ding, Lin.(2006).Tibetan basement rocks near Amdo reveal missing Mesozoic tectonism along the Bangong suture, central Tibet.GEOLOGY,34(6).
MLA	Guynn, Jerome H.,et al."Tibetan basement rocks near Amdo reveal missing Mesozoic tectonism along the Bangong suture, central Tibet".GEOLOGY 34.6(2006).