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Chapter 4.1b Antarctic Peninsula: petrology

View ORCID ProfileMalcolm J. Hole
Geological Society, London, Memoirs, 55, 327-343, 24 February 2021, https://doi.org/10.1144/M55-2018-40
Malcolm J. Hole
Department of Geology and Petroleum Geology, University of Aberdeen, Meston Building, King's College, Aberdeen AB24 3UE, UK
Roles: [Conceptualization (Lead)], [Writing – original draft (Lead)]
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Abstract

Scattered occurrences of Miocene–Recent volcanic rocks of the alkaline intraplate association represent one of the last expressions of magmatism along the Antarctic Peninsula. The volcanic rocks were erupted after the cessation of subduction which stopped following a series of northward-younging ridge crest–trench collisions. Volcanism has been linked to the development of a growing slab window beneath the extinct convergent margin. Geochemically, lavas range from olivine tholeiite through to basanite and tephrite. Previous studies have emphasized the slab-window tectonic setting as key to allowing melting of peridotite in the asthenospheric void caused by the passage of the slab beneath the locus of volcanism. This hypothesis is revisited in the light of more recent petrological research, and an origin from melting of subducted slab-hosted pyroxenite is considered here to be a more viable alternative for their petrogenesis. Because of the simple geometry of ridge subduction, and the well-established chronology of ridge crest–trench collisions, the Antarctic Peninsula remains a key region for understanding the transition from active to passive margin resulting from cessation of subduction. However, there are still some key issues relating to their tectonomagmatic association, and, principally, the poor geochronological control on the volcanic rocks requires urgent attention.

  • © 2021 The Author(s). Published by The Geological Society of London. All rights reserved
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Geological Society, London, Memoirs: 55 (1)
Geological Society, London, Memoirs
Volume 55
2021
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Chapter 4.1b Antarctic Peninsula: petrology

Malcolm J. Hole
Geological Society, London, Memoirs, 55, 327-343, 24 February 2021, https://doi.org/10.1144/M55-2018-40
Malcolm J. Hole
Department of Geology and Petroleum Geology, University of Aberdeen, Meston Building, King's College, Aberdeen AB24 3UE, UK
Roles: [Conceptualization (Lead)], [Writing – original draft (Lead)]
  • Find this author on Google Scholar
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  • ORCID record for Malcolm J. Hole

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Chapter 4.1b Antarctic Peninsula: petrology

Malcolm J. Hole
Geological Society, London, Memoirs, 55, 327-343, 24 February 2021, https://doi.org/10.1144/M55-2018-40
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    • Abstract
    • Distribution of the volcanic rocks and their tectonic setting
    • Petrology, geochemistry and petrogenesis
    • A slab-hosted pyroxenite source for the alkali basalts
    • Thermal structure before and after slab-window formation
    • Hydrous and anhydrous subducted slabs, and their relationship to magmatism
    • Remaining conundrums
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