Crustal rejuvenation stabilised Earth’s first cratons

Jacob A. Mulder (), Oliver Nebel, Nicholas J. Gardiner, Peter A. Cawood, Ashlea N. Wainwright and Timothy J. Ivanic
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Jacob A. Mulder: Monash University
Oliver Nebel: Monash University
Nicholas J. Gardiner: Monash University
Peter A. Cawood: Monash University
Ashlea N. Wainwright: University of Melbourne
Timothy J. Ivanic: Geological Survey of Western Australia, Department of Mines, Industry Regulation and Safety

Nature Communications, 2021, vol. 12, issue 1, 1-7

Abstract: Abstract The formation of stable, evolved (silica-rich) crust was essential in constructing Earth’s first cratons, the ancient nuclei of continents. Eoarchaean (4000–3600 million years ago, Ma) evolved crust occurs on most continents, yet evidence for older, Hadean evolved crust is mostly limited to rare Hadean zircons recycled into younger rocks. Resolving why the preserved volume of evolved crust increased in the Eoarchaean is key to understanding how the first cratons stabilised. Here we report new zircon uranium-lead and hafnium isotope data from the Yilgarn Craton, Australia, which provides an extensive record of Hadean–Eoarchaean evolved magmatism. These data reveal that the first stable, evolved rocks in the Yilgarn Craton formed during an influx of juvenile (recently extracted from the mantle) magmatic source material into the craton. The concurrent shift to juvenile sources and onset of crustal preservation links craton stabilisation to the accumulation of enduring rafts of buoyant, melt-depleted mantle.

Date: 2021
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DOI: 10.1038/s41467-021-23805-6

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