The subantarctic lithospheric mantle
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We present a summary of peridotite in the Subantarctic (46–60° S) surrounding the Antarctic Plate. Peridotite xenoliths occur on the Kerguelen Islands and Auckland Islands. The Kerguelen Islands are underlain by a plume, whereas the Auckland Islands are part of continental Zealandia, which is a Gondwana-rifted fragment. Small amounts of serpentinized peridotite has been dredged from fracture zones on the Southeast Indian Ridge, Southwest Indian Ridge and Pacific Antarctic Ridge, and represent upwelled asthenosphere accreted to form lith-osphere. Suprasubduction-zone peridotite was collected from two locations on the Sandwich Plate. Peridotites from most subantarctic occur-rences are moderately to highly depleted, and many show signs of subsequent metasomatic enrichment. Os isotopes indicate that subantarctic continental and oceanic lithospheric mantle contains ancient fragments that underwent depletion long before formation of the overlying crust.
Original language | English |
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Book series | Geological Society Memoir |
Volume | 56 |
Issue number | 1 |
Pages (from-to) | 115-132 |
Number of pages | 18 |
ISSN | 0435-4052 |
DOIs | |
Publication status | Published - 2023 |
Bibliographical note
Funding Information:
Funding The Kerguelen archipelago research was funded by CNRS, St Etienne and Toulouse III Universities research programmes, and the Paul Emile Victor Institute field campaigns (IPEV, France). The analytical data were obtained using instrumentation funded by DEST Systemic Infrastructure Grants, ARC LIEF, NCRIS/AuScope, industry partners and Macquarie University. The Auckland Islands research was funded by a Foundation for Science Research and Technology Fellowship (contract UOOX1004) to J.M. Scott, and a Canada Excellence Research Chair Funding to DGP and a 1000 Youth Talents Programme to J. Liu.
Publisher Copyright:
© 2021 The Author(s).
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