The last deglaciation in New Zealand ; new 10Be production rates from Misery moraines, Arthur’s Pass, Southern Alps

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dc.contributor.authorFink, Den_AU
dc.contributor.authorRother, Hen_AU
dc.contributor.authorWoodward, Cen_AU
dc.contributor.authorSchulmeister, Jen_AU
dc.contributor.authorWilcken, KMen_AU
dc.contributor.authorFujioka, Ten_AU
dc.date.accessioned2023-06-14T01:56:11Zen_AU
dc.date.available2023-06-14T01:56:11Zen_AU
dc.date.issued2019-07-29en_AU
dc.date.statistics2023-04-12en_AU
dc.description.abstractRecent debate on mid-latitude New Zealand glaciation has focused on reconstructing paleo-climate conditions leading into the (global) Last Glacial Maximum and subsequent deglaciation dynamics during the last termination. Paleo-environmental evidence coupled with reliable glacial chronologies confirms significant differences from that observed in northern hemisphere signatures of glacial change. The New Zealand glacial record does not show glacial readvance and strong cooling commensurate with Younger Dryas timing (~11.7-12.9 ka) and many lake pollen records suggest a minor cooling or hiatus in warming during the period from ~14.5 – 12.0 ka that is more commonly associated with the Antarctic Cold Reversal (ACR) (~14.7 - 13.0 ka). The Arthur’s Pass Moraine complex at 950 masl, deposited by an alpine glacier advancing out of the Otira Valley splaying east and westward over the divide of the Southern Alps in New Zealand, exhibits a full post-LGM glacial chronology. We have determined paired 10-Be and 26-Al exposure ages from 58 greywacke samples taken from all major moraines. Calculated exposure ages (using accepted local NZ production rates) show that the Arthur’s Pass moraine system spans a period of 19.5 ka to 12.0 ka with mean recessional moraine ages in chrono-stratigraphic sequence. The overall timing of deglaciation after peak LGM conditions is similar to the glacial systems we have dated in the Rakaia, Waimakariri and Rangitata Valleys. The Misery sequence shows ice retreat at the end of the ACR and no major advance during the YD period. Multiple cores from two intermorainal bog (Lances and Misery Tarns), separated by ~1 km and constrained by the terminal Dobson and Misery moraines, have been recovered for paleo-climate study. Basal glacial silts and organic matter have provided radiocarbon ages representing a minimum age for glacial retreat. Combined with the Misery moraine cosmogenic concentrations, new 10Be and 26Al production rate calibrations can be made for New Zealand to improve exposure age accuracy.en_AU
dc.identifier.citationFink, D., Rother, H., Woodward, C., Schilmeister, J., Wilcken, K., Fujioka, T. (2019). The last deglaciation in New Zealand ; new 10Be production rates from Misery moraines, Arthur’s Pass, Southern Alps. Paper presented to the 20th INQUA Congress, Dublin, Ireland, 25th - 31st July 2019. Retrieved from: https://virtual.oxfordabstracts.com/#/event/public/574/submission/1535en_AU
dc.identifier.conferenceenddate31 July 2019en_AU
dc.identifier.conferencename20th INQUA Congressen_AU
dc.identifier.conferenceplaceDublin, Irelanden_AU
dc.identifier.conferencestartdate25 July 2019en_AU
dc.identifier.urihttps://virtual.oxfordabstracts.com/#/event/public/574/submission/1535en_AU
dc.identifier.urihttps://apo.ansto.gov.au/handle/10238/15054en_AU
dc.language.isoenen_AU
dc.publisherInternational Union for Quaternary Research (INQUA)en_AU
dc.subjectGlaciersen_AU
dc.subjectNew Zealanden_AU
dc.subjectClimatic changeen_AU
dc.subjectEnvironmenten_AU
dc.subjectMorainesen_AU
dc.subjectBeryllium 10en_AU
dc.subjectAluminium 26en_AU
dc.subjectSouthern Hemisphereen_AU
dc.subjectNorthern Hemisphereen_AU
dc.titleThe last deglaciation in New Zealand ; new 10Be production rates from Misery moraines, Arthur’s Pass, Southern Alpsen_AU
dc.typeConference Abstracten_AU
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