Synorogenic hydrothermal origin for giant Hamersley iron oxide ore bodies

C.MCA. Powell, N.H.S. Oliver, Zheng-Xiang Li, D.MCB. Martin, J Ronaszeki

    Research output: Contribution to journalArticle

    121 Citations (Scopus)

    Abstract

    Geologic mapping, basin analysis, and calculated fluid compositions indicate that giant orebodies of microplaty hematite, and possibly martite-goethite, in the Hamersley province of Western Australia, were formed by heated fluids driven by early Paleoproterozoic orogenesis, Detrital grains of microplaty hematite in the McGrath trough, a foreland basin in front of the northward-advancing Ophthalmian fold belt constrain the age of the earliest microplaty hematite ore formation to 200 degrees C and locally up to 400 degrees C were involved. Regional circulation of hydrothermal fluids, including heated surface water, through reduced banded iron formations occurred during or soon after the Ophthalmian orogeny. We speculate that martite-goethite orebodies, previously considered Mesozoic-Cenozoic, could also be related to heated Paleoproterozoic meteoric fluids migrating northward away from the Ophthalmian fold belt.
    Original languageEnglish
    Pages (from-to)175-178
    JournalGeology
    Volume27
    Issue number2
    DOIs
    Publication statusPublished - 1999

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