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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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: | Articles |
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| 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). |
| Status: | Published |
| Refereed: | Yes |
| 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: | 2375-2548 |
| 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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