Reevaluating the evidence for a Hadean-Eoarchean dynamo

Borlina, Cauê S. and Weiss, Benjamin P. and Lima, Eduardo A. and Tang, Fengzai and Taylor, Richard J. M. and Einsle, Joshua F. and Harrison, Richard J. and Fu, Roger R. and Bell, Elizabeth A. and Alexander, Ellen W. and Kirkpatrick, Heather M. and Wielicki, Matthew M. and Harrison, T. Mark and Ramezani, Jahandar and Maloof, Adam C. (2020) Reevaluating the evidence for a Hadean-Eoarchean dynamo. Science Advances, 6 (15). eaav9634. ISSN 2375-2548 DOI https://doi.org/10.1126/sciadv.aav9634

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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.

Item Type:	Article
Uncontrolled Keywords:	2020AREP; IA76
Subjects:	03 - Mineral Sciences
Divisions:	03 - Mineral Sciences 07 - Gold Open Access
Journal or Publication Title:	Science Advances
Volume:	6
Page Range:	eaav9634
Identification Number:	https://doi.org/10.1126/sciadv.aav9634
Depositing User:	Sarah Humbert
Date Deposited:	09 Apr 2020 17:18
Last Modified:	09 Apr 2020 17:18
URI:	http://eprints.esc.cam.ac.uk/id/eprint/4677

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