Multiple sources for volcanic rocks dredged from the Western Australian rifted margin

Kelsie A. Dadd*, Laurent Kellerson, Irina Borissova, Gabriel Nelson

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    8 Citations (Scopus)

    Abstract

    Igneous rock samples recovered during the 2008-09 Australian Southwest Margin Marine Reconnaissance Survey (GA-2476), off the Western Australian coast from Perth to the Wallaby Plateau, come from a variety of tectonic settings reflecting a complex magmatic history of this margin. Cretaceous rhyolite and basaltic andesite samples most likely erupted in a continental extensional setting, while younger volcanic samples reflect a transition to a mature passive continental margin with the generation of mid-ocean ridge basalt. During the last phase of volcanism, a series of volcanic cones and mounds with ocean island basalt geochemical signatures formed along the margin. The pre-rift sedimentary rocks sampled on the Wallaby Plateau support the viewpoint that it is an extended block of continental crust, overlain by syn-rift and post-rift volcanic rocks.

    Original languageEnglish
    Pages (from-to)42-57
    Number of pages16
    JournalMarine Geology
    Volume368
    DOIs
    Publication statusPublished - 1 Oct 2015

    Keywords

    • Basalt geochemistry
    • Houtman Sub-basin
    • Sonne Ridge
    • Southwest Australian margin
    • Wallaby Plateau
    • Zeewyck Sub-basin

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