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Age Estimates on the Deposition of the Cave Ice Block in the Saarhalle Dachstein-Mammoth Cave (Mammuthöhle, Austria) based on 3H and 14C

Published online by Cambridge University Press:  02 October 2018

Z Kern*
Affiliation:
Institute for Geological and Geochemical Research, Research Centre for Astronomy and Earth Sciences, MTA, Budaörsi út 45, Budapest, H-1112, Hungary Isotope Climatology and Environmental Research Centre (ICER), MTA ATOMKI, Bem tér 18/c, Debrecen, Hungary
L Palcsu
Affiliation:
Isotope Climatology and Environmental Research Centre (ICER), MTA ATOMKI, Bem tér 18/c, Debrecen, Hungary
R Pavuza
Affiliation:
Working Group of Karst and Cave Science at the Natural History Museum Vienna, Burgring 7, Vienna, Austria
M Molnár
Affiliation:
Isotope Climatology and Environmental Research Centre (ICER), MTA ATOMKI, Bem tér 18/c, Debrecen, Hungary
*
*Corresponding author. Email: kern.zoltan@csfk.mta.hu.

Abstract

Measurements of the radiocarbon (14C) and tritium (3H) activity in a 5.8-m-long ice core from the Saarhalle, Dachstein-Mammoth Cave allowed a substantial revision of previous opinions concerning the age of the ice block, and provide useful experience that may be applied to future 14C dating of cave ice deposits. The stepped combustion technique results in a remarkably older radiocarbon age for the 800°C than for the 400°C fractions of the carbonaceous matter from ice layer samples. The highest tritium activity (37.2±1.2 TU) can be linked to the period of anthropogenically increased tritium activity of atmospheric precipitation at the mid-1960s, providing a well-dated radiochemical reference horizon. Compared the 3H-based extrapolated ages of two shallow samples to the expected atmospheric signal an average 14C reservoir bias of ~1500 BP was obtained for the insoluble organic fraction combusted at 400°C. The conventional 14C age measured for the 400°C fraction of the deeper samples has been corrected with the average reservoir bias. The median calibrated age of the deepest analyzed sample of the ice profile is ~1830 cal BC and a linear extrapolation to the bottom ice layer gave 2590 cal BC, making the Saarhalle ice block among the oldest dated cave ice deposits known in the Alpine domain.

Type
Soil
Copyright
© 2018 by the Arizona Board of Regents on behalf of the University of Arizona 

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Footnotes

Selected Papers from the 2nd Radiocarbon in the Environment Conference, Debrecen,Hungary, 3–7 July 2017

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