Bedout: A possible end-Permian impact crater offshore of northwestern Australia

L. Becker*, R. J. Poreda, A. R. Basu, K. O. Pope, T. M. Harrison, C. Nicholson, R. Iasky

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    183 Citations (Scopus)

    Abstract

    The Bedout High, located on the northwestern continental margin of Australia, has emerged as a prime candidate for an end-Permian impact structure. Seismic imaging, gravity data, and the identification of melt rocks and impact breccias from drill cores located on top of Bedout are consistent with the presence of a buried impact crater. The impact breccias contain nearly pure silica glass (SiO2), fractured and shock-melted plagioclases, and spherulitic glass. The distribution of glass and shocked minerals over hundreds of meters of core material implies that a melt sheet is present. Available gravity and seismic data suggest that the Bedout High represents the central uplift of a crater similar in size to Chicxulub. A plagioclase separate from the Lagrange-1 exploration well has an Ar/Ar age of 250.1 ± 4.5 million years. The location, size, and age of the Bedout crater can account for reported occurrences of impact debris in Permian-Triassic boundary sediments worldwide.

    Original languageEnglish
    Pages (from-to)1469-1476
    Number of pages8
    JournalScience
    Volume304
    Issue number5676
    DOIs
    Publication statusPublished - 4 Jun 2004

    Fingerprint

    Dive into the research topics of 'Bedout: A possible end-Permian impact crater offshore of northwestern Australia'. Together they form a unique fingerprint.

    Cite this