GSTDTAP  > 地球科学
DOI10.1038/s41561-019-0408-5
Early continental crust generated by reworking of basalts variably silicified by seawater
Andre, Luc1,2; Abraham, Kathrin3; Hofmann, Axel4; Monin, Laurence1; Kleinhanns, Ilka C.5; Foley, Stephen6
2019-09-01
发表期刊NATURE GEOSCIENCE
ISSN1752-0894
EISSN1752-0908
出版年2019
卷号12期号:9页码:769-+
文章类型Article
语种英语
国家Belgium; England; South Africa; Germany; Australia
英文摘要

The Archaean continental crust comprises two major groups of silicon-rich granitoids: the tonalite-trondhjemite-granodiorite and granite-monzonite-syenite suites, which differ in their sodium-to-potassium ratios. How these felsic granitoids evolved from their mafic precursors remains elusive and the subject of great debate. Here, we present silicon isotopic constraints on the formation of representative trondhjemitic and granitic plutons from the Kaapvaal craton that range in age from 3.51-2.69 billion years ago. We identified very consistent silicon isotopic signatures, all uniformly 0.1-0.2 parts per thousand heavier than rocks of the modern continental crust. This unusual composition is explained by the melting of a mafic source that included significant proportions (15-35 wt%) of silicified basalts, which were common supracrustal rocks before 3 billion years ago. Before the melting event that formed the granitoid magmas at depth, portions of the mafic source rocks were enriched in silica by interaction with silica-saturated seawater. The addition of silica depresses the stability of amphibole at similar water activity, allowing trondhjemitic and granitic melt production at lower temperatures from protoliths with contrasting silica contents: 52-57 and >= 60 wt%, respectively. This explains why granitoids were able to form very early in Earth history but did not emerge in significant amounts on other rocky planets.


领域地球科学 ; 气候变化
收录类别SCI-E
WOS记录号WOS:000484058100019
WOS关键词SILICON ISOTOPE FRACTIONATION ; BARBERTON MOUNTAIN LAND ; EASTERN KAAPVAAL CRATON ; SI ; GROWTH ; INSIGHTS ; RECORD ; CONSTRAINTS ; EVOLUTION ; SWAZILAND
WOS类目Geosciences, Multidisciplinary
WOS研究方向Geology
引用统计
文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/186889
专题地球科学
气候变化
作者单位1.Royal Museum Cent Africa, Earth Sci Dept, Tervuren, Belgium;
2.Univ Libre Bruxelles, Dept Geosci Environm & Soc, Lab G Time, Brussels, Belgium;
3.United Kingdom Atom Energy Author, Tritium Sci Grp, Abingdon, Oxon, England;
4.Univ Johannesburg, Dept Geol, Johannesburg, South Africa;
5.Univ Tubingen, FB Geowissensch Isotopengeochem, Tubingen, Germany;
6.Macquarie Univ, Dept Earth & Planetary Sci, Sydney, NSW, Australia
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GB/T 7714
Andre, Luc,Abraham, Kathrin,Hofmann, Axel,et al. Early continental crust generated by reworking of basalts variably silicified by seawater[J]. NATURE GEOSCIENCE,2019,12(9):769-+.
APA Andre, Luc,Abraham, Kathrin,Hofmann, Axel,Monin, Laurence,Kleinhanns, Ilka C.,&Foley, Stephen.(2019).Early continental crust generated by reworking of basalts variably silicified by seawater.NATURE GEOSCIENCE,12(9),769-+.
MLA Andre, Luc,et al."Early continental crust generated by reworking of basalts variably silicified by seawater".NATURE GEOSCIENCE 12.9(2019):769-+.
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