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地球化学和地球动力学揭示的冥古宙大陆地壳生长和岩石圈俯冲作用

Growth of continental crust and lithosphere subduction in the Hadean revealed by geochemistry and geodynamics.

作者信息

Vezinet Adrien, Chugunov Aleksandr V, Sobolev Alexander V, Jain Charitra, Sobolev Stephan V, Batanova Valentina G, Asafov Evgeny V, Koshlyakova Alina N, Arndt Nicholas T, Danyushevsky Leonid V, Valley John W

机构信息

Univ. Grenoble Alpes, Univ. Savoie Mont Blanc, CNRS, IRD, Univ. Gustave Eiffel, ISTerre, Grenoble, France.

GFZ Helmholtz Centre for Geosciences, Geodynamic Modelling Section, Potsdam, Germany.

出版信息

Nat Commun. 2025 Apr 25;16(1):3850. doi: 10.1038/s41467-025-59024-6.

DOI:10.1038/s41467-025-59024-6
PMID:40280901
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC12032353/
Abstract

The rates of continental crust growth and recycling on early Earth remain unclear due to the lack of information resulting from the extensive alteration of ancient rocks. Melt inclusions trapped and shielded from alteration in Archean high-Mg olivine crystals offer a solution to this problem. We report an unprecedented unradiogenic Sr mantle source component (Sr/Sr = 0.69932 ± 0.00024, 95% confidence interval) of melts included in olivine from 3.27 Ga komatiitic lava flows in the Barberton Greenstone Belt, South Africa. This component indicates a model age of 4.31 ± 0.19 Ga and significant chemical fractionation (Nb/U = 36.9 ± 1.5, Ce/Pb=16.7 ± 1.1), suggesting up to 80% ± 16% of the present-day continental crust's mass was extracted by the late Hadean from the whole mantle. Geodynamic models support this finding, explaining geochemical data by producing 40% to 70% of the present-day continental crust mass during the Hadean in a variable tectonic regime with tens of millions of years-long periods of massive impulsive subduction induced by mantle plumes.

摘要

由于古代岩石广泛蚀变导致信息缺失，早期地球大陆地壳的生长和再循环速率仍不明确。太古宙高镁橄榄石晶体中捕获并免受蚀变影响的熔体包裹体为解决这一问题提供了一种方法。我们报告了来自南非巴伯顿绿岩带32.7亿年科马提岩熔岩流中橄榄石所含熔体前所未有的非放射性锶地幔源成分（锶/锶=0.69932±0.00024，95%置信区间）。该成分表明其模式年龄为43.1±1.9亿年以及显著的化学分馏（铌/铀=36.9±1.5，铈/铅=16.7±1.1），这表明在冥古宙晚期，现今大陆地壳质量的80%±16%是从整个地幔中提取出来的。地球动力学模型支持这一发现，通过在地幔柱引发的长达数千万年的大规模脉冲式俯冲的可变构造环境中，在冥古宙期间产生现今大陆地壳质量的40%至70%来解释地球化学数据。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/28a5/12032353/8f9b7f2c54ce/41467_2025_59024_Fig9_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/28a5/12032353/754d07255562/41467_2025_59024_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/28a5/12032353/75404fe535f6/41467_2025_59024_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/28a5/12032353/ab686c805501/41467_2025_59024_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/28a5/12032353/cb5ee978cbaf/41467_2025_59024_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/28a5/12032353/be0f64c152c1/41467_2025_59024_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/28a5/12032353/2be61a5076a2/41467_2025_59024_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/28a5/12032353/f1195f8c02ec/41467_2025_59024_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/28a5/12032353/5371e6956daf/41467_2025_59024_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/28a5/12032353/8f9b7f2c54ce/41467_2025_59024_Fig9_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/28a5/12032353/754d07255562/41467_2025_59024_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/28a5/12032353/75404fe535f6/41467_2025_59024_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/28a5/12032353/ab686c805501/41467_2025_59024_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/28a5/12032353/cb5ee978cbaf/41467_2025_59024_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/28a5/12032353/be0f64c152c1/41467_2025_59024_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/28a5/12032353/2be61a5076a2/41467_2025_59024_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/28a5/12032353/f1195f8c02ec/41467_2025_59024_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/28a5/12032353/5371e6956daf/41467_2025_59024_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/28a5/12032353/8f9b7f2c54ce/41467_2025_59024_Fig9_HTML.jpg

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本文引用的文献

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Long-term preservation of Hadean protocrust in Earth's mantle.冥古宙原始地壳在地球地幔中的长期保存。
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Depth-dependent peridotite-melt interaction and the origin of variable silica in the cratonic mantle.深度依赖的橄榄岩-熔体相互作用与克拉通地幔中可变二氧化硅的起源
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