Reevaluating the evidence for a Hadean-Eoarchean dynamo | Zendy

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

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Reevaluating the evidence for a Hadean-Eoarchean dynamo

Author(s) -

Cauê S. Borlina,

B. P. Weiss,

Eduardo A. Lima,

Fengzai Tang,

Richard Taylor,

Joshua F. Einsle,

R. J. Harrison,

Roger Fu,

Elizabeth A. Bell,

Ellen Alexander,

Heather M. Kirkpatrick,

M. M. Wielicki,

T. Mark Harrison,

Jahandar Ramezani,

Adam C. Maloof

Publication year - 2020

Publication title -

science advances

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 5.928

H-Index - 146

ISSN - 2375-2548

DOI - 10.1126/sciadv.aav9634

Subject(s) - hadean , dynamo , astrobiology , geology , biology , physics , paleontology , crust , quantum mechanics , magnetic field

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.

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