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

doi:10.1126/sciadv.aav9634

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

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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.

Original language	English (US)
Article number	eaav9634
Journal	Science Advances
Volume	6
Issue number	15
DOIs	https://doi.org/10.1126/sciadv.aav9634
State	Published - 2020

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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., Mark Harrison, T., Ramezani, J., & Maloof, A. C. (2020). Reevaluating the evidence for a Hadean-Eoarchean dynamo. Science Advances, 6(15), [eaav9634]. https://doi.org/10.1126/sciadv.aav9634

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title = "Reevaluating the evidence for a Hadean-Eoarchean dynamo",

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.",

author = "Borlina, {Cau{\^e} S.} and Weiss, {Benjamin P.} and Lima, {Eduardo A.} and Fengzai Tang and Taylor, {Richard J.M.} and Einsle, {Joshua F.} and Harrison, {Richard J.} and Fu, {Roger R.} and Bell, {Elizabeth A.} and Alexander, {Ellen W.} and Kirkpatrick, {Heather M.} and Wielicki, {Matthew M.} and {Mark Harrison}, T. and Jahandar Ramezani and Maloof, {Adam C.}",

note = "Funding Information: 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). Publisher Copyright: Copyright {\textcopyright} 2020 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).",

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AU - Einsle, Joshua F.

AU - Harrison, Richard J.

AU - Fu, Roger R.

AU - Bell, Elizabeth A.

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AU - Kirkpatrick, Heather M.

AU - Wielicki, Matthew M.

AU - Mark Harrison, T.

AU - Ramezani, Jahandar

AU - Maloof, Adam C.

N1 - Funding Information: 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). Publisher Copyright: Copyright © 2020 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).

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AB - 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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Reevaluating the evidence for a Hadean-Eoarchean dynamo

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