Late Pleistocene and Holocene climate and environmental evolution of a subantarctic fjord ingression basin in the southwest Pacific

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dc.contributor.authorGreer, Gen_AU
dc.contributor.authorMoy, CMen_AU
dc.contributor.authorRiesselman, CRen_AU
dc.contributor.authorVandergoes, MJen_AU
dc.contributor.authorJacobsen, GEen_AU
dc.contributor.authorGorman, ARen_AU
dc.contributor.authorTidey, EJen_AU
dc.contributor.authorWilson, GSen_AU
dc.date.accessioned2021-06-28T22:19:58Zen_AU
dc.date.available2021-06-28T22:19:58Zen_AU
dc.date.issued2021-02-01en_AU
dc.date.statistics2021-06-18en_AU
dc.description.abstractSubantarctic islands are located at a critical latitude for reconstructing past changes in ocean-atmosphere interactions. Currently, there is a lack of high-resolution records from the Pacific sector of the Southern Ocean that can be used to reconstruct climate since the Last Glacial Maximum (LGM). Here, we present a reconstruction of environmental change from a fjord ingression basin at New Zealand’s subantarctic Auckland Islands (50.5°S) over the last ∼19 ka cal BP. Using sedimentological and geochemical analysis of cores collected along a depth transect in Norman Inlet we find evidence for four different stages of environmental history: deglacial, lacustrine, marine transgression, and marine. Glaciers retreated from their maximum extent before 19.4 ka cal BP during a period of ice retreat that appears synchronous across the Pacific basin, likely due to southward migration of the Subtropical Front. However, in contrast to other glaciated regions, we see no evidence for ice re-advance, and a proglacial lake was present in the basin until 15.7 ka cal BP. Following deglaciation, organic-rich sedimentation dominated the lacustrine environment until post-glacial sea-level rise flooded the depositional basin at 8.8 ka cal BP. Deposition of organic-rich sediment continued during the Antarctic Cold Reversal and we find no evidence for a glacial re-advance. Mixing of terrestrial and marine organic matter during the marine transgression (8.8–6.7 ka cal BP) indicates significant erosion and re-working of sediment in the catchment as seawater overtopped the sill. Modern fjord circulation commenced ∼6.7 ka cal BP when sea level reached its maximum in the early Holocene. This well-dated, high-resolution record constrains the timing of deglaciation, sea-level rise, and subantarctic environmental change following the LGM that expands our understanding of the key drives of climate change in the middle to high southern latitudes. © 2020 Elsevier Ltd.en_AU
dc.identifier.articlenumber106698en_AU
dc.identifier.citationGilmer, G., Moy, C. M., Riesselman, C. R., Vandergoes, M., Jacobsen, G., Gorman, A. R., Tidey, E. J. & Wilson, G. S. (2021). Late Pleistocene and Holocene climate and environmental evolution of a subantarctic fjord ingression basin in the southwest Pacific. Quaternary Science Reviews, 253, 106698. doi:10.1016/j.quascirev.2020.106698en_AU
dc.identifier.issn0277-3791en_AU
dc.identifier.journaltitleQuaternary Science Reviewsen_AU
dc.identifier.urihttps://doi.org/10.1016/j.quascirev.2020.106698en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/10926en_AU
dc.identifier.volume253en_AU
dc.language.isoenen_AU
dc.publisherElsevieren_AU
dc.subjectQuaternary perioden_AU
dc.subjectPleistocene epochen_AU
dc.subjectPaleoclimatologyen_AU
dc.subjectClimatesen_AU
dc.subjectGlaciersen_AU
dc.subjectStable isotopesen_AU
dc.subjectPacific Oceanen_AU
dc.subjectIslandsen_AU
dc.titleLate Pleistocene and Holocene climate and environmental evolution of a subantarctic fjord ingression basin in the southwest Pacificen_AU
dc.typeJournal Articleen_AU
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