Geochemistry of Archean shoshonitic lamprophyres from the Yilgarn Block, Western Australia: An abundance and association with gold mineralization

W.R. Taylor, N.M.S. Rock, David Groves, C.S. Perring, S.D. Golding

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    Abstract

    Spatial and temporal associations between Archean mesothermal gold deposits, shoshonitic minor intrusions (e.g. lamprophyre dikes), and crustal-scale fault systems are well recognized features of some Archean terranes. It has been proposed that the association may be due to a combination of genetic factors, including intrinsic Au enrichment of shoshonitic magmas, and tectono-structural factors arising from crustal-scale orogenic activity in the Late Archean. To determine the nature of the association in the highly mineralized Archean Yilgarn Block, the major, trace and precious metal geochemistry of a suite of 49 lamprophyres and related microdiorite porphyries, covering a range of alteration states and proximities to gold mineralization, were investigated. The lamprophyres exhibit rock fabrics indicative of partial to extensive metamorphic recrystallization, range from primitive to more evolved compositions (MgO approximately 9 to
    Original languageEnglish
    Pages (from-to)197-222
    JournalApplied Geochemistry
    Volume9
    DOIs
    Publication statusPublished - 1994

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