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Chapter 2.2b Palmer Land and Graham Land volcanic groups (Antarctic Peninsula): petrology

View ORCID ProfileTeal R. Riley and View ORCID ProfilePhilip T. Leat
Geological Society, London, Memoirs, 55, 139-156, 19 January 2021, https://doi.org/10.1144/M55-2018-51
Teal R. Riley
British Antarctic Survey, High Cross, Madingley Road, Cambridge CB3 0ET, UK
Roles: [Conceptualization (Lead)], [Writing – original draft (Lead)], [Writing – review & editing (Lead)]
  • Find this author on Google Scholar
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  • ORCID record for Teal R. Riley
  • For correspondence: [email protected]
Philip T. Leat
British Antarctic Survey, High Cross, Madingley Road, Cambridge CB3 0ET, UK
Roles: [Writing – original draft (Supporting)], [Writing – review & editing (Supporting)]
  • Find this author on Google Scholar
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Abstract

Large-volume rhyolitic volcanism along the proto-Pacific margin of Gondwana consists of three major episodes of magmatism or ‘flare-ups’. The initial episode (V1) overlaps with the Karoo–Ferrar large igneous provinces at c. 183 Ma. A second (V2) episode was erupted in the interval 171–167 Ma, and a third episode (V3) was emplaced in the interval 157–153 Ma. The magmatic events of the V1 and V2 episodes of the Antarctic Peninsula are reviewed here describing major and trace elements, and isotopic (Sr, Nd, O) data from rhyolitic volcanic rocks and more minor basaltic magmatism. An isotopically uniform intermediate magma developed as a result of anatexis of hydrous mafic lower crust, which can be linked to earlier, arc-related underplating. The subsequent lower-crust partial melts mixed with fractionated mafic underplate, followed by mid-crust storage and homogenization. Early Jurassic (V1) volcanic rocks of the southern Antarctic Peninsula are derived from the isotopically uniform magma, but they have mixed with melts of upper-crustal paragneiss in high-level magma chambers. The V2 rhyolites from the northern Antarctic Peninsula are the result of assimilation and fractional crystallization of the isotopically uniform magma. This process took place in upper-crust magma reservoirs involving crustal assimilants with an isotopic composition akin to that of the magma. A continental margin-arc setting was critical in allowing the development of an hydrous, fusible lower crust. Lower-crustal anatexis was in response to mafic underplating associated with the mantle plume thought to be responsible for the contemporaneous Karoo magmatic province and rifting associated with the initial break-up of Gondwana.

  • © 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 2.2b Palmer Land and Graham Land volcanic groups (Antarctic Peninsula): petrology

Teal R. Riley and Philip T. Leat
Geological Society, London, Memoirs, 55, 139-156, 19 January 2021, https://doi.org/10.1144/M55-2018-51
Teal R. Riley
British Antarctic Survey, High Cross, Madingley Road, Cambridge CB3 0ET, UK
Roles: [Conceptualization (Lead)], [Writing – original draft (Lead)], [Writing – review & editing (Lead)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • ORCID record for Teal R. Riley
  • For correspondence: [email protected]
Philip T. Leat
British Antarctic Survey, High Cross, Madingley Road, Cambridge CB3 0ET, UK
Roles: [Writing – original draft (Supporting)], [Writing – review & editing (Supporting)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • ORCID record for Philip T. Leat

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Chapter 2.2b Palmer Land and Graham Land volcanic groups (Antarctic Peninsula): petrology

Teal R. Riley and Philip T. Leat
Geological Society, London, Memoirs, 55, 139-156, 19 January 2021, https://doi.org/10.1144/M55-2018-51
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    • Abstract
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