Early subduction-exhumation and late channel flow of the Greater   Himalayan Sequence: implications from the Yadong section in the eastern   Himalaya

doi:10.1080/00206814.2011.626604

CORC > 北京大学 > 地球与空间科学学院

	Early subduction-exhumation and late channel flow of the Greater Himalayan Sequence: implications from the Yadong section in the eastern Himalaya
	Gong, Junfeng ; Ji, Jianqing ; Han, Baofu ; Chen, Jianjun ; Sun, Dongxia ; Li, Baolong ; Zhou, Jing ; Tu, Jiyao ; Zhong, Dalai
刊名	international geology review
	2012
关键词	high-pressure granulite subduction exhumation channel flow Greater Himalayan Sequence Yadong section U-PB ZIRCON HIGH-PRESSURE GRANULITES FISSION-TRACK THERMOCHRONOLOGY SOUTH TIBETAN DETACHMENT TECTONIC EVOLUTION DUCTILE EXTRUSION AR-40/AR-39 GEOCHRONOLOGY CONTINENTAL SUBDUCTION STRUCTURAL GEOMETRY NEPALESE HIMALAYA
DOI	10.1080/00206814.2011.626604
英文摘要	Based on metamorphic studies of the Yadong high-pressure (HP) granulite and multiple thermochronological investigations of granitoids from both upper and lower parts, the Yadong section in the eastern Himalaya constrains the Cenozoic tectonic evolution of the Greater Himalayan Sequence (GHS). The Yadong HP granulite, located at the top of the GHS, underwent a peak-stage HP granulite facies metamorphism and two stages of retrograde metamorphism. Granulite and hornblende facies retrograde metamorphism took place at 48.5 and 31.8 Ma, respectively, marking the time of exhumation of the subducted Indian slab to lower and middle crustal levels. Subsequently, an average young zircon U-Pb age obtained from the Yadong HP granulite indicated that this unit was captured by its surroundings in a partially molten condition at 16.9 Ma. In addition, three granitoids from both the lower and the upper parts of the GHS yielded biotite Ar-40/Ar-39 ages of 11.0, 11.3, and 11.5 million years. These consistent ages suggest that the GHS along the Yadong section was laterally extruded and synchronously cooled to similar to 300 degrees C at similar to 11.3 Ma. Furthermore, the granitic gneisses yield apatite fission track ages of similar to 7 million years, documenting the cooling of the GHS to similar to 110 degrees C. A two-stage model describes the Cenozoic tectonic evolution of the GHS: (1) the Indian slab had subducted under Tibet before similar to 55 Ma, and was exhumed to the lower crust (50-40 km) at 48.5 Ma, and to the middle crust (22-15 km) at 31.8 Ma; and (2) the partial melting occurred at middle crustal levels during the period 31.8 to 16.9 Ma, causing channel flow. In the late stage, the GHS was laterally extruded by ductile mid-crustal flow during the period 16.9 to similar to 7 Ma, characterized by a fast cooling rate of similar to 2 mm per year.; http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000304452700004&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701 ; Geology; SCI(E); 5; ARTICLE; 10; 1184-1202; 54
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/155740]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Gong, Junfeng,Ji, Jianqing,Han, Baofu,et al. Early subduction-exhumation and late channel flow of the Greater Himalayan Sequence: implications from the Yadong section in the eastern Himalaya[J]. international geology review,2012.
APA	Gong, Junfeng.,Ji, Jianqing.,Han, Baofu.,Chen, Jianjun.,Sun, Dongxia.,...&Zhong, Dalai.(2012).Early subduction-exhumation and late channel flow of the Greater Himalayan Sequence: implications from the Yadong section in the eastern Himalaya.international geology review.
MLA	Gong, Junfeng,et al."Early subduction-exhumation and late channel flow of the Greater Himalayan Sequence: implications from the Yadong section in the eastern Himalaya".international geology review (2012).