Sluggish Hadean geodynamics: Evidence from coupled 146,147Sm-142,143Nd systematics in Eoarchean supracrustal rocks of the Inukjuak domain (Québec)
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- 作者：G. Caroa ; b ; caro@crpg.cnrs-nancy.fr" class="auth_mail" title="E-mail the corresponding author ; P. Morinoa ; S.J. Mojzsisb ; c ; N.L. Catesb ; W. Bleekerd
- 关键词：146Sm&ndash ; 142Nd ; Hadean ; magma ocean ; sluggish tectonics ; Ukaliq ; Nuvvuagittuq
- 刊名：Earth and Planetary Science Letters
- 出版年：2017
- 出版时间：1 January 2017
- 年：2017
- 卷：457
- 期：Complete
- 页码：23-37
- 全文大小：1420 K
文摘
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Mafic rocks of the Ukaliq supracrustal belt display negative 142Nd anomalies.
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BIFs interleaved in the sequence show no evidence for in situ decay of 146Sm.
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142Nd anomalies are likely inherited from a metasomatically enriched mantle source.
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Sm–Nd systematics imply preservation of Earth's protocrust for >600 Myr.
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This suggests inefficient lithospheric recycling in the post magma ocean Earth.