Zircon SHRIMP dating confirms a Palaeoarchaean supracrustal terrain in the southeastern Kaapvaal Craton, southern Africa

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	Zircon SHRIMP dating confirms a Palaeoarchaean supracrustal terrain in the southeastern Kaapvaal Craton, southern Africa
	Xie, HQ (Xie, Hangqiang); Hofmann, A (Hofmann, Axel); Hegner, E (Hegner, Ernst); Wilson, A (Wilson, Allan); Wan, YS (Wan, Yusheng); Liu, DY (Liu, Dunyi)
刊名	GONDWANA RESEARCH
	2012
卷号	21 期号:4 页码:818-828
关键词	Zircon SHRIMP geochronology Nondweni Greenstone Belt Archaean Kaapvaal Craton Early life
ISSN号	1342-937X
英文摘要	We report SHRIMP zircon ages for felsic volcanic rocks of the early Archaean Nondweni greenstone belt (NGB) located in northern KwaZulu-Natal Province, South Africa. The NGB is part of a chain of greenstone belt remnants that occurs south of the well-known Barberton greenstone belt (BGB). Two samples of felsic volcanic rocks of the basal Toggekry Formation yielded zircon ages of similar to 3.53 Ga, whereas significantly younger ages of similar to 3.41 Ga were obtained for two samples of felsic rocks from near the top of the Witkop Formation. The latter date now constrains the age of stromatolite-like structures in cherts associated with the felsic rocks, which probably represent some of the oldest preserved evidence of life on Earth. The zircon ages also indicate that the NGB correlates well chronologically with the BGB and is one of the oldest volcano-sedimentary successions in the southeastern Kaapvaal Craton. Geochemical data for the felsic NGB rocks suggest formation by partial melting or crystal fractionation of a mafic source that was contaminated by older crust, possibly in a back-arc environment. Initial epsilon(Nd) values for NGB rocks range from -1.2 to +0.3 and suggest involvement of pre-greenstone continental crust that was possibly extensive in the southeastern part of the Kaapvaal Craton during Palaeoarchaean times. (C) 2011 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.
学科主题	地质年代学
WOS关键词	NONDWENI GREENSTONE-BELT ; TRACE-ELEMENT ; BARBERTON KOMATIITES ; DEPLETED KOMATIITES ; CRUST-FORMATION ; VOLCANIC-ROCKS ; SM-ND ; CONSTRAINTS ; MANTLE ; GEOCHRONOLOGY
WOS研究方向	Geology
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000303284100009
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/39707]
专题	中国地质调查局
作者单位	Univ Witwatersrand, Sch Geosci, ZA-2050 Wits, Johannesburg, South Africa
推荐引用方式 GB/T 7714	Xie, HQ ,Hofmann, A ,Hegner, E ,et al. Zircon SHRIMP dating confirms a Palaeoarchaean supracrustal terrain in the southeastern Kaapvaal Craton, southern Africa[J]. GONDWANA RESEARCH,2012,21(4):818-828.
APA	Xie, HQ ,Hofmann, A ,Hegner, E ,Wilson, A ,Wan, YS ,&Liu, DY .(2012).Zircon SHRIMP dating confirms a Palaeoarchaean supracrustal terrain in the southeastern Kaapvaal Craton, southern Africa.GONDWANA RESEARCH,21(4),818-828.
MLA	Xie, HQ ,et al."Zircon SHRIMP dating confirms a Palaeoarchaean supracrustal terrain in the southeastern Kaapvaal Craton, southern Africa".GONDWANA RESEARCH 21.4(2012):818-828.