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

文献类型：期刊论文

作者Gong, Junfeng1; Ji, Jianqing1; Han, Baofu1; Chen, Jianjun1; Sun, Dongxia1; Li, Baolong1; Zhou, Jing1; Tu, Jiyao1; Zhong, Dalai2
刊名INTERNATIONAL GEOLOGY REVIEW
出版日期2012
卷号54期号:10页码:1184-1202
关键词high-pressure granulite subduction exhumation channel flow Greater Himalayan Sequence Yadong section
ISSN号0020-6814
DOI10.1080/00206814.2011.626604
文献子类Article
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.
WOS关键词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
WOS研究方向Geology
语种英语
WOS记录号WOS:000304452700004
出版者TAYLOR & FRANCIS INC
资助机构National Natural Science Foundation of China(40872149 ; National Natural Science Foundation of China(40872149 ; 41002067) ; 41002067) ; National Natural Science Foundation of China(40872149 ; National Natural Science Foundation of China(40872149 ; 41002067) ; 41002067) ; National Natural Science Foundation of China(40872149 ; National Natural Science Foundation of China(40872149 ; 41002067) ; 41002067) ; National Natural Science Foundation of China(40872149 ; National Natural Science Foundation of China(40872149 ; 41002067) ; 41002067)
源URL[http://ir.iggcas.ac.cn/handle/132A11/84788]  
专题中国科学院地质与地球物理研究所
通讯作者Ji, Jianqing
作者单位1.Peking Univ, Sch Earth & Space Sci, Beijing 100871, Peoples R China
2.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
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,2012,54(10):1184-1202.
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,54(10),1184-1202.
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 54.10(2012):1184-1202.

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来源：地质与地球物理研究所

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