Age of the Mt Boggola volcanic succession and further geochronological constraint on the Ashburton Basin, Western Australia

Keith Sircombe

    Research output: Contribution to journalArticle

    10 Citations (Scopus)

    Abstract

    The age of strata in the Palaeoproterozoic Ashburton Basin is not well constrained, particularly the generally homogeneous, turbiditic and thick Ashburton Formation containing only a small fraction of volcanics suitable for geochronological examination. The Mt Boggola volcanic succession is one of these rare occurrences, consisting of mafic pillow lavas and breccia overlain by BIF chert, ferruginous pelite, mafic volcaniclastics and possible felsic tuffs identified in the course of mineral exploration. A locality proximal to the volcanic succession is interpreted as a fragmental volcaniclastic unit derived with minimal reworking from a tuff. Zircon extracted from this unit has yielded a SHRIMP Pb-207/Pb-206 weighted-mean age of 1829 +/- 5 Ma (95% conf.: chi(2) 1.0). This age is significantly older than that of the June Hill Volcanics in the northwest of the Ashburton Basin that had previously been surmised to be potentially coeval, and provides a further constraint on the evolution and diachroneity of the Ashburton Formation.
    Original languageEnglish
    Pages (from-to)967-974
    JournalAustralian Journal of Earth Sciences
    Volume50
    DOIs
    Publication statusPublished - 2003

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