Trace element partitioning during high-P partial melting and melt-rock interaction; an example from northern Fiordland, New Zealand

F. C. Schröter*, J. A. Stevenson, N. R. Daczko, G. L. Clarke, N. J. Pearson, K. A. Klepeis

*Corresponding author for this work

    Research output: Contribution to journalArticle

    22 Citations (Scopus)

    Abstract

    Pods of granulite facies dioritic gneiss in the Pembroke Valley, Milford Sound, New Zealand, preserve peritectic garnet surrounded by trondhjemitic leucosome and vein networks, that are evidence of high-P partial melting. Garnet-bearing trondjemitic veins extend into host gabbroic gneiss, where they are spatially linked with the recrystallization of comparatively low-P two-pyroxene-hornblende granulite to fine-grained high-P garnet granulite assemblages in garnet reaction zones. New data acquired using a Laser Ablation Inductively Coupled Plasma Mass Spectrometer (LA-ICPMS) for minerals in various textural settings indicate differences in the partitioning of trace elements in the transition of the two rock types to garnet granulite, mostly due to the presence or absence of clinozoisite. Garnet in the garnet reaction zone (gabbroic gneiss) has a distinct trace element pattern, inherited from reactant gabbroic gneiss hornblende. Peritectic garnet in the dioritic gneiss and garnet in trondhjemitic veins from the Pembroke Granulite have trace element patterns inherited from the melt-producing reaction in the dioritic gneiss. The distinct trace element patterns of garnet link the trondhjemitic veins geochemically to sites of partial melting in the dioritic gneiss.

    Original languageEnglish
    Pages (from-to)443-457
    Number of pages15
    JournalJournal of Metamorphic Geology
    Volume22
    Issue number5
    DOIs
    Publication statusPublished - Jun 2004

    Fingerprint Dive into the research topics of 'Trace element partitioning during high-P partial melting and melt-rock interaction; an example from northern Fiordland, New Zealand'. Together they form a unique fingerprint.

  • Cite this