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Radiocarbon Variations from Tasmanian Conifers: First Results from Late Pleistocene and Holocene Logs

Published online by Cambridge University Press:  18 July 2016

Mike Barbetti ,
Trevor Bird ,
George Dolezal ,
Gillian Taylor ,
Roger Francey ,
Edward Cook  and
Mike Peterson
Mike Barbetti
Affiliation:
The NWG Macintosh Centre for Quaternary Dating, Madsen Building F09, University of Sydney, Sydney NSW 2006 Australia
Trevor Bird
Affiliation:
Trades Hall, 219 New Town Road, New Town, Tasmania 7008 Australia
George Dolezal
Affiliation:
The NWG Macintosh Centre for Quaternary Dating, Madsen Building F09, University of Sydney, Sydney NSW 2006 Australia
Gillian Taylor
Affiliation:
The NWG Macintosh Centre for Quaternary Dating, Madsen Building F09, University of Sydney, Sydney NSW 2006 Australia
Roger Francey
Affiliation:
CSIRO Division of Atmospheric Research, Private Bag No. 1, Mordialloc, Victoria 3195 Australia
Edward Cook
Affiliation:
Lamont-Doherty Geological Observatory of Columbia University, Palisades, New York 10964 USA
Mike Peterson
Affiliation:
Forestry Commission, Hobart, Tasmania 7001 Australia
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Abstract

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Dendrochronological studies have begun on two conifer species in the Stanley River area of western Tasmania. The chronology extends to 273 BC for Huon pine (Lagarostrobos franklinii) and to AD 1450 for celery-top pine (Phyllocladus aspleniifolius). Apart from living or recently felled trees, sections have been taken from 58 logs preserved in floodplain sediments. Two of these logs have late Pleistocene ages, centered around 13.0 and 12.7 k 14C yr bp. Four logs are between 8 and 9 ka BP, and one is centered at 7.3 ka bp. The remaining logs have various ages between 6.2 ka BP and the present. 14C measurements have been performed on decadal samples from the two late Pleistocene logs, providing short (260-yr) records of atmospheric 14C variations when plotted against individual ring numbers. Decadal measurements on the 7300-yr-old log have been wiggle-matched with 14C calibration curves from German oak and bristlecone pine. Measurements for the period, AD 1600–1800, show good agreement with northern hemisphere results, and a nearly zero offset between the hemispheres.

Type
IV. Paleoclimatology
Information
Radiocarbon , Volume 34 , Issue 3: Proceedings of the 14th International Radiocarbon Conference , 1992 , pp. 806 - 817
Copyright
Copyright © The American Journal of Science 

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