Reevaluating the evidence for a Hadean-Eoarchean dynamo.
Published version
Peer-reviewed
Repository URI
Repository DOI
Change log
Authors
Borlina, Cauê S https://orcid.org/0000-0003-3456-232X
Weiss, Benjamin P https://orcid.org/0000-0003-3113-3415
Lima, Eduardo A https://orcid.org/0000-0002-5667-0033
Tang, Fengzai https://orcid.org/0000-0002-9937-0620
Taylor, Richard JM https://orcid.org/0000-0003-3013-9372
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.
Description
Keywords
37 Earth Sciences, 51 Physical Sciences, 3703 Geochemistry, 3705 Geology, 3706 Geophysics
Journal Title
Sci Adv
Conference Name
Journal ISSN
2375-2548
2375-2548
2375-2548
Volume Title
6
Publisher
American Association for the Advancement of Science (AAAS)
Publisher DOI
Sponsorship
Natural Environment Research Council (NE/P002498/1)
European Research Council (320750)
European Research Council (320750)
NERC and ERC