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    New P–T and U–Pb constraints on Alpine Schist metamorphism in south Westland, New Zealand

    Access Status
    Fulltext not available
    Authors
    Scott, J.
    Auer, A.
    Muhling, J.
    Czertowicz, T.
    Cooper, A.
    Billia, M.
    Kennedy, Allen
    Date
    2015
    Type
    Journal Article
    
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    Citation
    Scott, J. and Auer, A. and Muhling, J. and Czertowicz, T. and Cooper, A. and Billia, M. and Kennedy, A. 2015. New P–T and U–Pb constraints on Alpine Schist metamorphism in south Westland, New Zealand. New Zealand Journal of Geology and Geophysics. 58 (4): pp. 385-397.
    Source Title
    New Zealand Journal of Geology and Geophysics
    DOI
    10.1080/00288306.2015.1093005
    ISSN
    0028-8306
    School
    Department of Physics and Astronomy
    URI
    http://hdl.handle.net/20.500.11937/28896
    Collection
    • Curtin Research Publications
    Abstract

    Metamorphic mineral compositions of a staurolite-bearing greyschist from the middle reaches of the Moeraki River valley in south Westland reveal peak equilibration at c. 558 ± 50 °C and c. 6.1 ± 1.2 kbar. Two c. 83 Ma U–Pb monazite age populations from the cores of monazite-apatite-allanite-epidote corona structures in mylonitised schists from near Fox Glacier confirm that Alpine Schist metamorphism occurred during the Late Cretaceous. The published spread in Late Cretaceous metamorphic ages indicates that metamorphism was diachronous or was a protracted event. Further dating is required to pin down the cryptic transition into the Jurassic–Early Cretaceous metamorphosed Otago Schist, but the Alpine Schist must extend at least 11 km east of the Alpine Fault in south Westland and overprint the suture between the Pounamu and Rakaia terranes. The P–T–t results imply that the Late Cretaceous crust represented by portions of the Alpine Schist was probably of similar thickness to that beneath the Southern Alps today, but with dehydration and partial melting occurring near the base. The crust under Westland and Otago may be dry and therefore strong.

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