Identification of mantle peridotite as a possible Iapetan ophiolite sliver in south Shetland, Scottish Caledonides

James M. D. Day, Brian O'Driscoll, Rob A. Strachan, J. Stephen Daly, Richard J. Walker

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    Abstract

    The Neoproterozoic Dunrossness Spilite Subgroup of south Shetland, Scotland, has been interpreted as a series of komatiitic and mafic lava flows formed in a marginal basin in response to Laurentian continental margin rifting. We show that ultramafic rocks previously identified as komatiites are depleted mantle peridotites that experienced seafloor hydrothermal alteration. The presence of positive Bouguer gravity and aeromagnetic anomalies extending from the Dunrossness Spilite Subgroup northward to the Shetland Ophiolite Complex suggests instead that these rocks may form part of an extensive ophiolite sliver, obducted during Iapetus Ocean closure in a forearc setting.
    Original languageEnglish
    Pages (from-to)88-92
    JournalJournal of the Geological Society
    Volume174
    Early online date22 Sep 2016
    DOIs
    Publication statusPublished - Jan 2017

    Keywords

    • seafloor hydrothermal alteration
    • Iapetan ophiolite silver
    • mantle peridotite
    • Iapetus Ocean closure
    • Scottish Caledonides
    • Dunrossness Spilite Subgroup
    • Neoproterozoic Dunrossness Spilite Subgroup
    • aeromagnetic anomalies
    • Bouguer gravity
    • Setland Ophiolite Complex
    • ultramafic rocks
    • margin rifting
    • ophiolite sliver

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