Cosmogenic 10Be and 26Al exposure ages of moraines in the Rakaia Valley, New Zealand and the nature of the last termination in New Zealand glacial systems

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dc.contributor.authorShulmeister, Jen_AU
dc.contributor.authorFink, Den_AU
dc.contributor.authorHyatt, OMen_AU
dc.contributor.authorThackray, GDen_AU
dc.contributor.authorRother, Hen_AU
dc.date.accessioned2010-09-13T02:26:10Zen_AU
dc.date.available2010-09-13T02:26:10Zen_AU
dc.date.issued2010-09-01en_AU
dc.date.statistics2010-09-01en_AU
dc.description.abstractNew Zealand glaciers reached their last glacial maximum position at or before ~ 25 ka, and, as early as 23 ka, commenced a slow and continual retreat. New cosmogenic exposure ages and field mapping from the Rakaia Valley in the South Island suggest that extensive ice survived well into the latter half of the Last Glacial–Interglacial Transition (18–11 ka), with the post-15 ka period inferred to have near Holocene climate conditions based on ecological proxy data. By as late as ~ 15.5 ka, glacier termini had retreated as little as 5–10 km from glacial maximum positions. Numerous minor ice still-stand positions and oscillations are recognized, but the record specifically excludes evidence for either a major climatic amelioration at ~ 15–16 ka or a significant glacial re-advance during the Antarctic Cold Reversal (ACR) or the Younger Dryas (YD). We conclude that the currently widespread interpretation of an episodic New Zealand glacial record since the LGM is an artifact of valley-dependent retreat processes. Pro-glacial lake formation and local site conditions combined to give an apparent, but misleading, picture of glacial retreat punctuated by major, climatically driven, re-advances. © 2010, Elsevier Ltd.en_AU
dc.identifier.citationShulmeister, J., Fink, D., Hyatt, O. M., Thackray, G. D., & Rother, H. (2010). Cosmogenic 10Be and 26Al exposure ages of moraines in the Rakaia Valley, New Zealand and the nature of the last termination in New Zealand glacial systems. Earth and Planetary Science Letters, 297(3-4), 558-566. doi:10.1016/j.epsl.2010.07.007en_AU
dc.identifier.govdoc2664en_AU
dc.identifier.issn0012-821Xen_AU
dc.identifier.issue3-4en_AU
dc.identifier.journaltitleEarth and Planetary Science Lettersen_AU
dc.identifier.pagination558-566en_AU
dc.identifier.urihttp://dx.doi.org/10.1016/j.epsl.2010.07.007en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/2504en_AU
dc.identifier.volume297en_AU
dc.language.isoenen_AU
dc.publisherElsevieren_AU
dc.subjectNew Zealanden_AU
dc.subjectIsotope datingen_AU
dc.subjectMorainesen_AU
dc.subjectGlaciersen_AU
dc.subjectEnvironmental exposureen_AU
dc.subjectClimatic changeen_AU
dc.titleCosmogenic 10Be and 26Al exposure ages of moraines in the Rakaia Valley, New Zealand and the nature of the last termination in New Zealand glacial systemsen_AU
dc.typeJournal Articleen_AU
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