HR: 1340h
AN: PP33B-0921    [Abstracts]
TI: The glacial record of New Zealand's Southern Alps
AU: * Schaefer, J M
EM: schaefer@ldeo.columbia.edu
AF: Lamont-Doherty Earth Observatory, Geochemistry, Palisades, NY 10964 United States
AU: Denton, G
EM: denton@um.edu
AF: University of Maine, Geological Sciences, Orono, ME 04469 United States
AU: Lowell, T
EM: thomas.lowell@uc.edu
AF: University of Cincinnati, Geology, Cincinnati, OH 45221 United States
AU: Anderson, B
EM: anderson@uon.nw
AF: University of Oslo, Geology, Oslo, 10000 Norway
AU: Rinterknecht, V
EM: vincent@ldeo.columbia.edu
AF: Lamont-Doherty Earth Observatory, Geochemistry, Palisades, NY 10964 United States
AU: Schlosser, P
EM: peters@ldeo.columbia.edu
AF: Lamont-Doherty Earth Observatory, Geochemistry, Palisades, NY 10964 United States
AU: Ivy-Ochs, S
EM: ivy@phys.ethz.ch
AF: ETH Zuerich, Geography, Zuerich, 8092 Switzerland
AU: Kubik, P
EM: kubik@particle.phis.ethz.ch
AF: ETH Zuerich, Geography, Zuerich, 8092 Switzerland
AU: Schluechter, C
EM: schleuchter@geologie.unibe.ch
AF: University of Berne, Geology, Berne, 3012 Switzerland
AU: Chinn, T
EM: chinn@nzonline.nz
AF: Institute of Geology and Nuclear Sciences, Dunedin Research Center, Dunedin, 764 New Zealand
AU: Barrell, D
EM: D.Barrell@gns.cri.nz
AF: Institute of Geology and Nuclear Sciences, Dunedin Research Center, Dunedin, 764 New Zealand
AU: Lifton, N
EM: lifton@geo.arizona.edu
AF: University of Arizona, AMS Laboratory, Tucson, AZ 85721 United States
AU: Jull, T
EM: jull@email.arizona.edu
AF: University of Arizona, Geology, Tucson, AZ 85721 United States
AB: We present detailed mapping and surface exposure dating using in-situ Be-10 and C-14 of the moraine set of Lake Pukaki, New Zealand's Southern Alps, spanning from the penultimate glaciation, over several Last Glacial Maximum (LGM) moraines, the late glacial event to Holocene glacial advances. New Zealand, a mountain ridge in the middle of the Southern Ocean, has one of the best preserved moraine records world-wide, offering the opportunity to reconstruct amplitude and timing of climate changes from Southern mid-latitudes, an area where paleoclimate data is scarce. The extensive mapping effort by G. Denton and colleagues (http://wyvern.gns.cri.nz/website/csigg/) provides a unique background for sample selection for Surface Exposure Dating. Our extensive data set (>40 samples analyzed so far) indicate that (i) the LGM in New Zealand terminated clearly prior to the Boelling/Alleroed warming, (ii) the late glacial advance is within uncertainties consistent with the timing of the Younger Dryas cold reversal; (iii) there occurred an early Holocene glacial event of the same amplitude than the Little Ice Age. This latter event is the first Holocene glacial event from the Southern Hemisphere dated by in-situ Be-10 and C-14.
DE: 1824 Geomorphology (1625)
DE: 1827 Glaciology (1863)
DE: 1035 Geochronology
DE: 1620 Climate dynamics (3309)
SC: Paleoceanography and Paleoclimatology [PP]
MN: 2004 AGU Fall Meeting