Age frequency distribution and revised stable isotope curves for New Zealand speleothems: Palaeoclimatic implications

Williams, Paul W., Nei, Helen L. and Zhao, Jian-Xin (2010) Age frequency distribution and revised stable isotope curves for New Zealand speleothems: Palaeoclimatic implications. International Journal of Speleology, 39 2: 99-112.

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Author Williams, Paul W.
Nei, Helen L.
Zhao, Jian-Xin
Title Age frequency distribution and revised stable isotope curves for New Zealand speleothems: Palaeoclimatic implications
Journal name International Journal of Speleology   Check publisher's open access policy
ISSN 0392-6672
Publication date 2010-07
Sub-type Article (original research)
Volume 39
Issue 2
Start page 99
End page 112
Total pages 14
Place of publication Bologna, Italy
Publisher Societa Speleologica Italiana
Collection year 2011
Language eng
Formatted abstract The occurrence of speleothems in New Zealand with reversed magnetism indicates that secondary calcite deposition in caves has occurred for more than 780 thousand years (ka). 394 uranium-series dates on 148 speleothems show that such deposition has taken place somewhere in the country with little interruption for more than 500 ka. A relative probability distribution of speleothem ages indicates that most growth occurred in mild, moist interglacial and interstadial intervals, a conclusion reinforced by comparing peaks and troughs in the distribution with time series curves of speleothem δ18O and δ13C values. The stable isotope time series were constructed using data from 15 speleothems from two different regions of the country. The greater the number of overlapping speleothem series (i.e. the greater the sample depth) for any one region, the more confidence is justified in considering the stacked record to be representative of the region. Revising and extending earlier work, composite records are produced for central-west North Island (CWNI) and north-west South Island (NWSI). Both demonstrate that over the last 15 ka the regions responded similarly to global climatic events, but that the North Island site was also influenced by the waxing and waning of regional subtropical marine influences that penetrated from the north but did not reach the higher latitudes of the South Island. Cooling marking the commencement of the last glacial maximum (LGM) was evident from about 28 ka. There was a mid-LGM interstadial at 23-21.7 ka and Termination 1 occurred around 18.1 ka. The glacial-interglacial transition was marked by a series of negative excursions in δ18O that coincide with dated recessional moraines in South Island glaciers. A late glacial cooling event, the NZ Late Glacial Reversal, occurred from 13.4-11.2 ka and this was followed by an early Holocene optimum at 10.8 ka. Comparison of δ18O records from NWSI and EPICA DML ice-core shows climatic events in New Zealand to lag those in Antarctica by several centuries to a thousand years. Waxing and waning of subantarctic and subtropical oceanic influences in the Tasman Sea are considered the immediate drivers of palaeoclimatic change.
Keyword New Zealand
Palaeoclimate
Speleothems
Stable isotopes
Uranium series
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2011 Collection
Centre for Microscopy and Microanalysis Publications
 
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Created: Tue, 08 Mar 2011, 15:36:25 EST by Professor Jian Zhao on behalf of Centre for Microscopy and Microanalysis