An andesitic source for Jack Hills zircon supports onset of plate tectonics in the Hadean

Simon Turner*, Simon Wilde, Gerhard Wörner, Bruce Schaefer, Yi-Jen Lai

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

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    The composition and origin of Earth’s early crust remains hotly debated. Here we use partition coefficients to invert the trace element composition of 4.3–3.3 Gyr Jack Hills zircons to calculate the composition of the melts from which they crystallised. Using this approach, the average SiO2 content of these melts was 59 ± 6 wt. % with Th/Nb, Dy/Yb and Sr/Y ratios of 2.7 ± 1.9, 0.9 ± 0.2 and 1.6 ± 0.7, respectively. Such features strongly indicate that the protolith for the Jack Hills zircons was not an intra-plate mafic rock, nor a TTG (tondjhemite-tonalite-granodiorite) or a Sudbury-like impact melt. Instead, the inferred equilibrium melts are much more similar to andesites formed in modern subduction settings. We find no evidence for any secular variation between 4.3 and 3.3 Gyr implying little change in the composition or tectonic affinity of the Earth's early crust from the Hadean to Mesoarchaean.
    Original languageEnglish
    Article number1241
    Pages (from-to)1-5
    Number of pages5
    JournalNature Communications
    Publication statusPublished - 6 Mar 2020

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