Reassessment of continental growth during the accretionary history of the Central Asian Orogenic Belt

doi:10.1016/j.gr.2012.12.023

	Reassessment of continental growth during the accretionary history of the Central Asian Orogenic Belt
	Kroener, A.19; Kovach, V.; Belousova, E.; Hegner, E.; Armstrong, R.; Dolgopolova, A.; Seltmann, R.; Alexeiev, D. V.; Hoffmann, J. E.; Wong, J.
刊名	GONDWANA RESEARCH
	2014
卷号	25 期号:1 页码:103-125
关键词	Central Asian Orogenic Belt Nd-Hf isotopes Crustal growth Crustal reworking Juvenile crust
ISSN号	1342-937X
DOI	10.1016/j.gr.2012.12.023
英文摘要	We argue that the production of mantle-derived or juvenile continental crust during the accretionary history of the Central Asian Orogenic Belt (CAOB) has been grossly overestimated. This is because previous assessments only considered the Palaeozoic evolution of the belt, whereas its accretionary history already began in the latest Mesoproterozoic. Furthermore, much of the juvenile growth in Central Asia occurred in late Permian and Mesozoic times, after completion of CAOB evolution, and perhaps related to major plume activity. We demonstrate from zircon ages and Nd-Hf isotopic systematics from selected terranes within the CAOB that many Neoproterozoic to Palaeozoic granitoids in the accreted terranes of the belt are derived from melting of heterogeneous Precambrian crust or through mixing of old continental crust with juvenile or short-lived material, most likely in continental arc settings. At the same time, juvenile growth in the CAOB occurred during the latest Neoproterozoic to Palaeozoic in oceanic island arc settings and during accretion of oceanic, island arc, and Precambrian terranes. However, taking together, our data do not support unusually high crust-production rates during evolution of the CAOB. Significant variations in zircon epsilon(Hf) values at a given magmatic age suggest that granitoid magmas were assembled from small batches of melt that seem to mirror the isotopic characteristics of compositionally and chronologically heterogeneous crustal sources. We reiterate that the chemical characteristics of crustally-derived granitoids are inherited from their source(s) and cannot be used to reconstruct tectonic settings, and thus many tectonic models solely based on chemical data may need re-evaluation. Crustal evolution in the CAOB involved both juvenile material and abundant reworking of older crust with varying proportions throughout its accretionary history, and we see many similarities with the evolution of the SW Pacific and the Tasmanides of eastern Australia. (C) 2013 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.
学科主题	构造地质学
WOS关键词	ZIRCON U-PB ; PHANEROZOIC CRUSTAL GROWTH ; LARGE IGNEOUS PROVINCE ; ND ISOTOPIC EVIDENCE ; EARLY CALEDONIAN SUPERTERRANE ; EARLY EARTH DIFFERENTIATION ; PALEOASIAN OCEAN FORMATION ; ARABIAN-NUBIAN SHIELD ; TUVA-MONGOLIA MASSIF ; ISLAND-ARC SYSTEM
WOS研究方向	Geology
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000328099900005
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/41566]
专题	中国地质科学院地质研究所
作者单位	1.[Kroener, A.] Chinese Acad Geol Sci, Beijing SHRIMP Ctr, Beijing, Peoples R China 2.[Kroener, A.] Johannes Gutenberg Univ Mainz, Dept Geosci, Mainz, Germany 3.[Kovach, V. 4.Rytsk, E.] Russian Acad Sci, Inst Precambrian Geol & Geochronol, St Petersburg, Russia 5.[Belousova, E.] Macquarie Univ, Dept Earth & Planetary Sci, Australian Res Council Ctr Excellence Core Crust, Sydney, NSW 2109, Australia 6.[Hegner, E.] Univ Munich, Dept Geo & Environm Sci, D-81377 Munich, Germany 7.[Armstrong, R. 8.Dolgopolova, A. 9.Seltmann, R.] Nat Hist Museum, Dept Earth Sci, CERCAMS, London SW7 5BD, England 10.[Alexeiev, D. V.
推荐引用方式 GB/T 7714	Kroener, A.,Kovach, V.,Belousova, E.,et al. Reassessment of continental growth during the accretionary history of the Central Asian Orogenic Belt[J]. GONDWANA RESEARCH,2014,25(1):103-125.
APA	Kroener, A..,Kovach, V..,Belousova, E..,Hegner, E..,Armstrong, R..,...&Rytsk, E..(2014).Reassessment of continental growth during the accretionary history of the Central Asian Orogenic Belt.GONDWANA RESEARCH,25(1),103-125.
MLA	Kroener, A.,et al."Reassessment of continental growth during the accretionary history of the Central Asian Orogenic Belt".GONDWANA RESEARCH 25.1(2014):103-125.