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Radiocarbon Dating of Quaternary Loess Deposits, Banks Peninsula, Canterbury, New Zealand

Published online by Cambridge University Press:  20 January 2017

K.M. Goh ,
B.P.J. Molloy  and
T.A. Rafter
K.M. Goh
Affiliation:
Department of Soil Science, Lincoln College, Canterbury, New Zealand
B.P.J. Molloy
Affiliation:
Botany Division, DSIR, Christchurch, New Zealand
T.A. Rafter
Affiliation:
Institute of Nuclear Sciences, DSIR, Lower Hutt, New Zealand
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Abstract

Quaternary loess deposits containing charcoal and in situ organic matter constituents from Banks Peninsula, New Zealand, were subjected to various physical and chemical treatments before radiocarbon assay. A stepwide procedure was used in which each component was radiocarbon dated before and after the treatments were applied. The criterion adopted for judging the effectiveness of a treatment is an increase in the radiocarbon age of loess layer. On this basis the oldest and therefore the most reliable date was obtained from the intra-loess charcoal and its humic acid extract. By comparison, the radiocarbon ages of organic matter constituents of the whole or partitioned loess were much younger, and are considered to represent only average ages for the particular layers concerned. No advantage was gained by dating the carbon-enriched clay-humus fraction as opposed to whole loess samples. There is an apparent conflict between our dates and current interpretation of loess stratigraphy and chronology in the South Island of New Zealand, which requires further investigation. This uncertainty apart, the upper layers of multiple loess deposits are clearly much older than earlier reports indicate, and it follows that the correlation of these deposits with late-glacial events both within and beyond New Zealand is even more tenuous and unreliable than previously thought to be the case.

Type
Research Article
Information
Quaternary Research , Volume 7 , Issue 2 , March 1977 , pp. 177 - 196
Copyright
University of Washington

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