Reevaluating the evidence for a Hadean-Eoarchean dynamo

Cauê S. Borlina, Benjamin P. Weiss, Eduardo A. Lima, Fengzai Tang, Richard J.M. Taylor, Joshua F. Einsle, Richard J. Harrison, Roger R. Fu, Elizabeth A. Bell, Ellen W. Alexander, Heather M. Kirkpatrick, Matthew M. Wielicki, T. Mark Harrison, Jahandar Ramezani, Adam C. Maloof

Research output: Contribution to journalArticlepeer-review

20 Scopus citations


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.

Original languageEnglish (US)
Article numbereaav9634
JournalScience Advances
Issue number15
StatePublished - 2020

All Science Journal Classification (ASJC) codes

  • General


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