Paleomagnetism of the Brewer Conglomerate in central Australia, and fast movement of Gondwanaland during the Late Devonian

Z. Chen, Zheng-Xiang Li, C.MCA. Powell, Basil Balme

    Research output: Contribution to journalArticle

    36 Citations (Scopus)

    Abstract

    Palaeomagnetic analysis of 11 diamond-drill cores from the Late Devonian Brewer Conglomerate in the northeastern part of the Amadeus Basin, central Australia, yields three magnetic components: a drilling-induced remanence (C1) acquired during the industrial drilling process, a mid- to Late Carboniferous syn-deformational overprint (C2) acquired during the Alice Springs Orogeny, and a primary remanence (C3). C3 passes a fold test and gives a latest Devonian pole (BC) at 47.1-degrees-S, 041.0-degrees-E with A95=6.4-degrees. The revised APWP for Gondwanaland requires West Gondwanaland to drift across the South Pole during the Late Devonian with a speed of approximately 20 cm yr-1, while East Gondwanaland remained at low-latitude positions. It is suggested that fast plate movement occurred far more often during the Palaeozoic than has previously been thought.
    Original languageEnglish
    Pages (from-to)564-574
    JournalGeophysical Journal International
    Volume115
    DOIs
    Publication statusPublished - 1993

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