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Reevaluating the evidence for a Hadean-Eoarchean dynamo

Author(s): Borlina, Cauê S; Weiss, Benjamin P; Lima, Eduardo A; Tang, Fengzai; Taylor, Richard JM; et al

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Abstract: The time of origin of the geodynamo has important implications for the thermal evolution of the planetary interior and the habitability of early Earth. It has been proposed that detrital zircon grains from Jack Hills, Western Australia, provide evidence for an active geodynamo as early as 4.2 billion years (Ga) ago. However, our combined paleomagnetic, geochemical, and mineralogical studies on Jack Hills zircons indicate that most have poor magnetic recording properties and secondary magnetization carriers that postdate the formation of the zircons. Therefore, the existence of the geodynamo before 3.5 Ga ago remains unknown.
Publication Date: 8-Apr-2020
Citation: Borlina, Cauê S., Benjamin P. Weiss, Eduardo A. Lima, Fengzai Tang, Richard JM Taylor, Joshua F. Einsle, Richard J. Harrison et al. "Reevaluating the evidence for a Hadean-Eoarchean dynamo." Science Advances 6, no. 15 (2020): eaav9634. doi:10.1126/sciadv.aav9634.
DOI: doi:10.1126/sciadv.aav9634
EISSN: 2375-2548
Pages: eaav9634 - ?
Language: eng
Type of Material: Journal Article
Journal/Proceeding Title: Science Advances
Version: Final published version. This is an open access article.

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