SHRIMP U-Pb zircon geochronology of high-grade rocks and charnockites from the eastern Amery Ice Shelf and southwestern Prydz Bay, East Antarctica Constraints on Late Mesoproterozoic to Cambrian tectonothermal events related to supercontinent assembly

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	SHRIMP U-Pb zircon geochronology of high-grade rocks and charnockites from the eastern Amery Ice Shelf and southwestern Prydz Bay, East Antarctica Constraints on Late Mesoproterozoic to Cambrian tectonothermal events related to supercontinent assembly
	Liu, XC (Liu, Xiaochun); Zhao, Y (Zhao, Yue); Song, BA (Song, Biao); Liu, J (Liu, Jian); Cui, JJ (Cui, Jianjun)
刊名	GONDWANA RESEARCH
	2009
卷号	16 期号:2 特刊 SI 页码:342-361
关键词	Late Mesoproterozoic/Early Neoproterozoic Late Neoproterozoic/Cambrian Tectonothermal event Charnockite East Antarctica
ISSN号	1342-937X
英文摘要	The eastern Amery Ice Shelf (EAIS) and southwestern Prydz Bay are situated near the junction between the Late Neoproterozoic/Cambrian high-grade complex of the Prydz Belt and the Early Neoproterozoic Rayner Complex. The area contains an important geological section for understanding the tectonic evolution of East Antarctica. SHRIMP U-Pb analyses on zircons of felsic orthogneisses and mafic granulites from the area indicate that their protoliths were emplaced during four episodes of ca. 1380 Ma, ca. 1210-1170 Ma, ca. 1130-1120 Ma and ca. 1060-1020 Ma. Subsequently, these rocks experienced two episodes of high-grade metamorphism at >970 Ma and ca. 930-900 Ma, and furthermore, most of them (except for some from the Munro Kerr Mountains and Reinbolt Hills) were subjected to high-grade metamorphic recrystallization at ca. 535 Ma. Two suites of charnockite, i.e. the Reinbolt and Jennings chamockites, intrude the Late Mesoproterozoic/Early Neoproterozoic and Late Neoproterozoic/Cambrian high-grade complexes at >955 Ma and 500 Ma, respectively. These, together with associated granites of similar ages, reflect late-to-post-orogenic magmatism occurring during the two major orogenic events. The similarity in age patterns suggests that the EAIS-Prydz Bay region may have suffered from the same high-grade tectonothermal evolution with the Rayner Complex and the Eastern Chats of India. Three segments might constitute a previously unified Late Mesoproterozoic/Early Neoproterozoic orogen that resulted from the long-term magmatic accretion from ca. 1380 to 1020 Ma and eventual collision before ca. 900 Ma between India and the western portion of East Antarctica. The Prydz Belt may have developed on the eastern margin of the Indo-Antarctica continental block, and the Late Neoproterozoic/Cambrian suture assembling Indo-Antarctica and Australo-Antarctica continental blocks should be located southeastwards of the EAIS-Prydz Bay region. (c) 2009 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.
学科主题	前寒武纪地质
WOS关键词	PRINCE-CHARLES MOUNTAINS ; ZONE SOUTHERN ALPS ; LARSEMANN HILLS ; RAUER GROUP ; TH-PB ; GHATS BELT ; KEMP-LAND ; TEMPERATURE METAMORPHISM ; POLYMETAMORPHIC TERRANE ; METAPELITIC GRANULITES
WOS研究方向	Geology
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000269274000016
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/39085]
专题	中国地质调查局
作者单位	Chinese Acad Geol Sci, Inst Geol, Beijing SHRIMP Ctr, Beijing 100037, Peoples R China
推荐引用方式 GB/T 7714	Liu, XC ,Zhao, Y ,Song, BA ,et al. SHRIMP U-Pb zircon geochronology of high-grade rocks and charnockites from the eastern Amery Ice Shelf and southwestern Prydz Bay, East Antarctica Constraints on Late Mesoproterozoic to Cambrian tectonothermal events related to supercontinent assembly[J]. GONDWANA RESEARCH,2009,16(2 特刊 SI):342-361.
APA	Liu, XC ,Zhao, Y ,Song, BA ,Liu, J ,&Cui, JJ .(2009).SHRIMP U-Pb zircon geochronology of high-grade rocks and charnockites from the eastern Amery Ice Shelf and southwestern Prydz Bay, East Antarctica Constraints on Late Mesoproterozoic to Cambrian tectonothermal events related to supercontinent assembly.GONDWANA RESEARCH,16(2 特刊 SI),342-361.
MLA	Liu, XC ,et al."SHRIMP U-Pb zircon geochronology of high-grade rocks and charnockites from the eastern Amery Ice Shelf and southwestern Prydz Bay, East Antarctica Constraints on Late Mesoproterozoic to Cambrian tectonothermal events related to supercontinent assembly".GONDWANA RESEARCH 16.2 特刊 SI(2009):342-361.