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Holocene Vegetation and Paleoclimatic and Paleomagnetic History from Lake Johnston, Tasmania

Published online by Cambridge University Press:  20 January 2017

Sharon A. Anker
Affiliation:
School of Geosciences, University of Newcastle, Callaghan, New South Wales, 2308, Australia
Eric A. Colhoun
Affiliation:
School of Geosciences, University of Newcastle, Callaghan, New South Wales, 2308, Australia
Charles E. Barton
Affiliation:
Australian Geological Survey Organisation, Canberra, ACT, 2601, Australia
Mike Peterson
Affiliation:
Department of Plant Science, University of Tasmania, Sandy Bay, Tasmania, 7005, Australia
Mike Barbetti
Affiliation:
Macintosh Centre for Quaternary Dating, University of Sydney, Sydney, New South Wales, 2006, Australia

Abstract

Lake Johnston cirque contains some of the best subalpine rainforest in Tasmania. Pollen from the sediments shows Lagarostrobos franklinii, which presently reaches 1040 m, may be a glacial relict. Nothofagus cunninghamii–Nothofagus gunnii subalpine rainforest developed between 9000 and 6000 14C yr B.P., with a maximum at 8700 14C yr B.P. After 6000 14C yr B.P. Nothofagus gunnii became more important, and from 3600 14C yr B.P. sclerophyll and heath components increased. Partial burning of the catchment occurred periodically. Early Holocene climate was warmer and wetter than late Holocene climate. The vegetation and climate changes are similar to those recorded from western South Island New Zealand and Chile. Radiocarbon dates give a sedimentation rate of 0.43 mm/yr. Cores are correlated by magnetic susceptibility. Magnetic ages are assigned by matching with the 14C-dated secular variation master curve for southeastern Australia. Magnetic ages are consistent with the 14C chronology when the former are adjusted by 350 years.

Type
Research Article
Copyright
University of Washington

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