Journal
SCIENCE ADVANCES
Volume 6, Issue 15, Pages -Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.aav9634
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Funding
- NSF [1339051, EAR 1647504, EAR 1847042, DMS 1521765]
- European Research Council under the European Union's Seventh Framework Programme/European Research Council Grant [FP/2007-2013, 320750]
- Natural Environment Research Council [NE/P002498/1]
- Instrumentation and Facilities Program, Division of Earth Sciences, NSF [1339051]
- NERC [NE/P002498/1] Funding Source: UKRI
- Division Of Earth Sciences
- Directorate For Geosciences [1339051] Funding Source: National Science Foundation
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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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