Change of tectono-stratigraphic regime in the Australian plate during the 99 Ma (mid-Cretaceous) and 43 Ma (mid Eocene) swerves of the Pacific

J. J. Veevers*

*Corresponding author for this work

    Research output: Contribution to journalArticle

    76 Citations (Scopus)

    Abstract

    The clockwise bend at 99 Ma (mid-Cretaceous) in linear volcanic chains in the tropical Pacific coincides with a change from pre-99 Ma head-on Chilean-type subduction of the Pacific plate beneath eastern Gondwana to 99-43 Ma sinistral oblique Mariana-type subduction and strike-slip breakup by simple sea-floor spreading between Australia and Antarctica and by backarc spreading in the southwest Pacific. The 99 Ma breakup of Australia from Antarctica is documented by a mid-Cretaceous unconformity. This tectono-stratigraphic change founded modern Australia, with a mountain chain along an upper plate margin in the east and lowlands on the lower plate margin in the south. The counterclockwise bend at 43 Ma (mid-Eocene)-the Emperor-Hawaiian bend-coincides with the onset of structure in the Challenger Rift of New Zealand, the Eromanga-Cooper basin of central Australia, and the oil-shale grabens of coastal Queensland.

    Original languageEnglish
    Pages (from-to)47-50
    Number of pages4
    JournalGeology
    Volume28
    Issue number1
    DOIs
    Publication statusPublished - 2000

    Keywords

    • Australia
    • Hotspots bends
    • Mid-Cretaceous
    • Mid-Eocene
    • Pacific

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