The multi-stage tectonic evolution of the Xitieshan terrane, North   Qaidam orogen, western China: From Grenville-age orogeny to   early-Paleozoic ultrahigh-pressure metamorphism

doi:10.1016/j.gr.2015.04.011

CORC > 北京大学 > 地球与空间科学学院

	The multi-stage tectonic evolution of the Xitieshan terrane, North Qaidam orogen, western China: From Grenville-age orogeny to early-Paleozoic ultrahigh-pressure metamorphism
	Zhang, Cong ; Bader, Thomas ; Zhang, Lifei ; van Roermund, Herman
刊名	GONDWANA RESEARCH
	2017
关键词	Neoproterozoic orogeny U-Pb zircon geochronology Tectonic evolution Xitieshan North Qaidam UHP metamorphic belt U-PB GEOCHRONOLOGY NW CHINA CONTINENTAL COLLISION TIBETAN PLATEAU UHPM BELT HP/UHP TERRANE OCEANIC-CRUST SOUTH CHINA NORTHWESTERN CHINA GARNET PERIDOTITE
DOI	10.1016/j.gr.2015.04.011
英文摘要	The geodynamic evolution of the early Paleozoic ultrahigh-pressure metamorphic belt in North Qaidam, western China, is controversial due to ambiguous interpretations concerning the nature and ages of the eclogitic protoliths. Within this framework, we present newLA-ICP-MS U-Pb zircon ages from eclogites and their country rock gneisses from the Xitieshan terrane, located in the central part of the North Qaidam UHP metamorphic belt. Xitieshan terrane contains clearly different protolith characteristics of eclogites and as such provides a natural laboratory to investigate the geodynamic evolution of the North Qaidam UHP metamorphic terrane. LA-ICP-MS U-Pb zircon dating of three phengite-bearing eclogites and two country rock gneiss samples from the Xitieshan terrane yielded 424-427 Ma and 917-920 Ma ages, respectively. The age of 424-427 Ma from eclogite probably reflects continental lithosphere subduction post-dating oceanic lithosphere subduction at similar to 440-460 Ma. The 0.91-0.92 Ga metamorphic ages from gneiss and associated metamorphic mineral assemblages are interpreted as evidence for the occurrence of a Grenville-age orogeny in the North Qaidam UHPM belt. Using internal microstructure, geochemistry and U-Pb ages of zircon in this study, combined with the petrological and geochemical investigations on the eclogites of previous literature's data, three types of eclogitic protoliths are identified in the Xitieshan terrane i.e. 1) Subducted early Paleozoic oceanic crust (440-460 Ma), 2) Neoproterozoic oceanic crust material emplaced onto micro-continental fragments ahead of the main, early Paleozoic, collision event (440-420 Ma) and 3) Neoproterozoic mafic dikes intruded in continental fragments (rifted away from the former supercontinent Rodinia). These results demonstrate that the basement rocks of the North Qaidam terrane formed part of the former supercontinent Rodinia, attached to the Yangtze Craton and/or the Qinling microcontinent, and recorded a complex tectono-metamorphic evolution that involved Neoproterozoic and Early Paleozoic orogenies. (C) 2015 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.; National Nature Science Foundation of China [41202034, 41350110224]; Basic Geological Survey Program of China Geological Survey [1212011121258, 12120115026801]; Basic Outlay of Scientific Research Work from the Ministry of Science and Technology [J1518]; SCI(E); ARTICLE; 290-300; 41
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/476137]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Zhang, Cong,Bader, Thomas,Zhang, Lifei,et al. The multi-stage tectonic evolution of the Xitieshan terrane, North Qaidam orogen, western China: From Grenville-age orogeny to early-Paleozoic ultrahigh-pressure metamorphism[J]. GONDWANA RESEARCH,2017.
APA	Zhang, Cong,Bader, Thomas,Zhang, Lifei,&van Roermund, Herman.(2017).The multi-stage tectonic evolution of the Xitieshan terrane, North Qaidam orogen, western China: From Grenville-age orogeny to early-Paleozoic ultrahigh-pressure metamorphism.GONDWANA RESEARCH.
MLA	Zhang, Cong,et al."The multi-stage tectonic evolution of the Xitieshan terrane, North Qaidam orogen, western China: From Grenville-age orogeny to early-Paleozoic ultrahigh-pressure metamorphism".GONDWANA RESEARCH (2017).