Unusual Hf contents in metamorphic zircon from coesite-bearing eclogites of the Dabie Mountains, east-central China: Implications for the dating of ultrahigh-pressure metamorphism

X. Wang*, W. L. Griffin

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    16 Citations (Scopus)

    Abstract

    Metamorphic zircon from coesite-bearing eclogites in the Dabie Mountains encloses high-P phases, and may have formed at the peak of ultrahigh-pressure (UHP) metamorphism. Morphologically, the metamorphic zircon typically occurs as small, multi-faceted, near-spherical grains with homogeneous internal structure and weak backscattered electron (BSE) luminescence. Geochemically, it is characterized by extremely high and relatively constant contents of hafnium (Hf) and very low contents of Y, U and Th, reflecting the contraction of the zircon lattice under the UHP conditions. High contents of Hf may be characteristic of zircon formed during UHP metamorphism, which has important consequences for interpretation of geochronological results. We propose that the metamorphic zircon extremely enriched in Hf may be used to date the peak of UHP metamorphism that produced the coesite-bearing eclogites in the Dabie Mountains, and potentially in other UHP terranes.

    Original languageEnglish
    Pages (from-to)629-637
    Number of pages9
    JournalJournal of Metamorphic Geology
    Volume22
    Issue number7
    DOIs
    Publication statusPublished - Sep 2004

    Fingerprint Dive into the research topics of 'Unusual Hf contents in metamorphic zircon from coesite-bearing eclogites of the Dabie Mountains, east-central China: Implications for the dating of ultrahigh-pressure metamorphism'. Together they form a unique fingerprint.

    Cite this