New Zealand Journal of Geology and Geophysics abstracts
A late Quaternary pollen record from marine core P69, southeastern
North Island, New Zealand
MATTHEW S. MCGLONE
Landcare Research
P.O. Box 69
Lincoln, New Zealand
Abstract Marine core P69 (115 km off the southeastern North
Island) has already yielded a 26 000 yr record of carbonate and silica
influx, δO18 stratigraphy, foraminifera, and sea-surface
temperatures. A pollen analysis of the core is presented here. The full-glacial
(25 000-15 000 yr BP) pollen assemblages reflect a southern North
Island landscape largely covered with scrub and grassland, but only limited
areas of cool-temperate forest. Abundant reworked Tertiary pollen types
indicate increased erosion at this time. Rapid spread of podocarp-dominant
forest occurred between 15 000 and 11 500 yr BP, an event that
relates only in a general way to increasing sea-surface temperatures, but
coincides exactly with a sharp reduction of wind-induced upwelling and
terrestrially sourced quartz. The abrupt movement southwards of the glacially
expanded zone of strong westerlies at c. 15 000 yr BP, rather than
warming, appears to be the main factor controlling postglacial
reafforestation.
Keywords Last Glaciation; postglacial; late Quaternary;
palynology; paleoceanography; vegetation history; climate change; Hawke's Bay;
North Island; New Zealand
New Zealand Journal of Geology & Geophysics, 2001, Vol. 44: 69-77
0028-8306/01/4401-0069 $7.00/0 (c) The Royal Society of New Zealand
2001
PDF file of entire paper: medium quality (985K); (scanned from paper original: notes about this process)
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