Reevaluating the evidence for a Hadean-Eoarchean dynamo
Name
eaav9634.full.pdf
Description
Published version
Size
654.18 KB
Format
Adobe PDF
Checksum (MD5)
93b41a2b8d499e95d35f2000866fcc1b
Author(s)
Borlina, Cauê S
Weiss, Benjamin P
Lima, Eduardo A
Tang, Fengzai
Taylor, Richard JM
Einsle, Joshua F
Harrison, Richard J
Fu, Roger R
Bell, Elizabeth A
Alexander, Ellen W
Date Issued
2020
Journal
Science Advances
Publisher
American Association for the Advancement of Science (AAAS)
Version
Final published version
Abstract
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). 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.
MIT Department
Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences
Terms of Use
Creative Commons Attribution NonCommercial License 4.0
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1126/sciadv.aav9634
