Magmatic and Crustal Differentiation History of Granitic Rocks from Hf-O Isotopes in Zircon

AIS Kemp, Christopher John Hawkesworth, GL Foster, BA Paterson, JD Woodhead, JM Hergt, CM Gray, MJ Whitehouse

    Research output: Contribution to journalArticlepeer-review

    1308 Citations (Scopus)

    Abstract

    Granitic plutonism is the principal agent of crustal differentiation, but linking granite emplacement to crust formation requires knowledge of the magmatic evolution, which is notoriously difficult to reconstruct from bulk rock compositions. We unlocked the plutonic archive through hafnium (Hf) and oxygen (O) isotope analysis of zoned zircon crystals from the classic hornblende-bearing (I-type) granites of eastern Australia. This granite type forms by the reworking of sedimentary materials by mantle-like magmas instead of by remelting ancient metamorphosed igneous rocks as widely believed. I-type magmatism thus drives the coupled growth and differentiation of continental crust.

    Original languageEnglish
    Pages (from-to)980-983
    Number of pages4
    JournalScience
    Volume315
    Issue number5814
    DOIs
    Publication statusPublished - 16 Feb 2007

    Keywords

    • LACHLAN FOLD BELT
    • I-TYPE GRANITES
    • SOUTHEASTERN AUSTRALIA
    • CONTINENTAL-CRUST
    • SIERRA-NEVADA
    • MIXING MODEL
    • S-TYPE
    • CRYSTALLIZATION
    • ASSIMILATION
    • PHENOCRYSTS

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