Re-evaluating the evidence for a Hadean-Eoarchean dynamo

Borlina, C.S. et al. (2020) Re-evaluating the evidence for a Hadean-Eoarchean dynamo. Science Advances, 6, eaav9634. (doi: 10.1126/sciadv.aav9634)

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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:Articles
Additional Information:Funding: This study was supported by the NSF (grants EAR 1647504, EAR 1847042, and DMS 1521765) and the European Research Council under the European Union’s Seventh Framework Programme (Grant FP/2007-2013)/European Research Council Grant Agreement 320750, Natural Environment Research Council Grant NE/P002498/1. The UCLA ion microprobe facility is partly supported by a grant from the Instrumentation and Facilities Program, Division of Earth Sciences, NSF (1339051).
Glasgow Author(s) Enlighten ID:Einsle, Dr Joshua Franz
Authors: Borlina, C.S., Weiss, B.P., Lima, E.A., Tang, F., Taylor, R.J.M., Einsle, J.F., Harrison, R.J., Fu, R.R., Bell, E.A., Alexander, E.W., Kirkpatrick, H.M., Wielicki, M.M., Harrison, T.M., Ramezani, J., and Maloof, A.C.
College/School:College of Science and Engineering > School of Geographical and Earth Sciences > Earth Sciences
Journal Name:Science Advances
Publisher:American Association for the Advancement of Science
ISSN (Online):2375-2548
Copyright Holders:Copyright © 2020 The Authors
First Published:First published in Science Advances 6:eaav9634
Publisher Policy:Reproduced under a Creative Commons license

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