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

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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
Early online date22 Sep 2016
Publication statusPublished - Jan 2017


  • Identification of mantle peridotite

    Rights statement: Journal of the Geological Society, 174, © Geological Society of London 2016.

    Accepted author manuscript (Post-print), 879 KB, PDF document

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