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Showing 1–3 of 3 results
Advanced filters: Author: Aaron J. Cavosie Clear advanced filters

  • Geochemical data from zircons show that subduction-like processes were operating contemporaneously with stagnant-lid-like processes at different locations as early as 4.4 billion years ago on the Hadean Earth.

    • John W. Valley
    • Tyler B. Blum
    • Alexander V. Sobolev
    ResearchOpen Access
    Nature
    P: 1-6

  • The oldest minerals on Earth are thought to have formed in the Hadean eon, but the reliability of the dates has been questioned. Atom-probe tomography of an ancient zircon confirms that the mineral formed about 4.4 billion years ago, implying that any mixing event of the silicate Earth occurred before that time.

    • John W. Valley
    • Aaron J. Cavosie
    • Michael J. Spicuzza
    Research
    Nature Geoscience
    Volume: 7, P: 219-223

  • The ~70 km-diameter Yarrabubba impact structure in Western Australia has previously been regarded as among Earth’s oldest meteorite craters, but has hitherto lacked absolute age constraints. Here, the authors determine a precise impact age of 2229 ± 5 Ma, which extends the terrestrial cratering record back in time by > 200 million years and establishes Yarrabubba as the oldest recognised meteorite impact structure on Earth.

    • Timmons M. Erickson
    • Christopher L. Kirkland
    • Thomas M. Davison
    ResearchOpen Access
    Nature Communications
    Volume: 11, P: 1-8