The subantarctic lithospheric mantle

Abstract We present a summary of peridotite in the Subantarctic (46–60° S) surrounding Antarctic Plate. Peridotite xenoliths occur on Kerguelen Islands and Auckland Islands. The are underlain by plume, whereas part continental Zealandia, which is Gondwana-rifted fragment. Small amounts serpentinized has been dredged from fracture zones Southeast Indian Ridge, Southwest Ridge Pacific represent upwelled asthenosphere accreted to form lithosphere. Suprasubduction-zone was collected two locations Sandwich Peridotites most subantarctic occurrences moderately highly depleted, many show signs subsequent metasomatic enrichment. Os isotopes indicate that oceanic lithospheric mantle contains ancient fragments underwent depletion long before formation overlying crust.