The distribution of radioactive heat production in I- and S-type granites and residual source regions

Implications to high heat flow areas in the Lachlan Fold Belt, Australia

W. N. Sawka, B. W. Chappell

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    20 Citations (Scopus)

    Abstract

    An analysis of the uranium and thorium fractionation processes in various granites implies a direct dependence on processes of magmatic differentiation, the magma source materials, and residual accessory phases; suggesting that no universal, vertical heat-producing element distribution may be applied to all granite crust. Metaluminous I-type granites show evidence for downward decreases in heat-producing elements within the plutons. The heat-producing element content of I-type residual source regions is probably similar to that of the most mafic I-type granites. The fractionation trends of peraluminous S-type granite indicate that no significant change in heat-producing elements should occur with depth in the plutons. Geochemical evidence indicates that residual source regions of S-type granites will contain high concentrations of heat-producing elements and reside deep in the crust. Anomalously high heat flow in southeastern Australia corresponds to areas of S-type granites and may be largely due to deep crustal radioactivity, rather than Cainozoic mafic magmatism.

    Original languageEnglish
    Pages (from-to)107-118
    Number of pages12
    JournalAustralian Journal of Earth Sciences
    Volume33
    Issue number2
    DOIs
    Publication statusPublished - 1986

    Keywords

    • Accessory minerals
    • Granites
    • Heat flow
    • Radioactive heat production
    • Residual material

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