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    Partial melting of metabasic rocks in Val Strona di Omegna, Ivrea Zone, northern Italy

    225273_225273.pdf (2.660Mb)
    Access Status
    Open access
    Authors
    Kunz, B.
    Johnson, Tim
    White, R.
    Redler, C.
    Date
    2014
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Kunz, B. and Johnson, T. and White, R. and Redler, C. 2014. Partial melting of metabasic rocks in Val Strona di Omegna, Ivrea Zone, northern Italy. Lithos. 190-191: pp. 1-12.
    Source Title
    Lithos
    DOI
    10.1016/j.lithos.2013.11.015
    ISSN
    0024-4937
    Remarks

    NOTICE: this is the author’s version of a work that was accepted for publication in Lithos. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Lithos, Vol.190-191, (2014). DOI: 10.1016/j.lithos.2013.11.015

    URI
    http://hdl.handle.net/20.500.11937/14040
    Collection
    • Curtin Research Publications
    Abstract

    Field and petrographic observations combined with major and trace element bulk rock geochemistry show that metabasic rocks within Val Strona di Omegna in the central Ivrea Zone partially melted during granulite facies regional metamorphism. A transition from granoblastic amphibolite facies metabasic rocks at the lowest metamorphic grades to metatexitic and diatexitic migmatites in the granulite facies records the effects of in situ fluid-absent partial melting. Coarse-grained euhedral clinopyroxene porphyroblasts within leucosomes are consistent with anatexis via incongruent fluid-absent melting reactions consuming hornblende, plagioclase and quartz to form clinopyroxene and melt. Field observations are supported by bulk rock geochemistry, in which high-grade samples are generally depleted in mobile elements relative to unmigmatised mid amphibolite facies rocks that may approximate pre-melting protolith compositions. Many of the metabasic rocks at the highest-grade parts of Val Strona di Omegna probably belong to the Kinzigite Formation and are unlikely to be part of the younger Mafic Complex as previously proposed.

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