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- W2895514860 abstract "ABSTRACT Measurements of the radiocarbon ( 14 C) and tritium ( 3 H) 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 14 C 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 3 H-based extrapolated ages of two shallow samples to the expected atmospheric signal an average 14 C reservoir bias of ~1500 BP was obtained for the insoluble organic fraction combusted at 400°C. The conventional 14 C 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." @default.
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- W2895514860 date "2018-10-01" @default.
- W2895514860 modified "2023-10-17" @default.
- W2895514860 title "Age Estimates on the Deposition of the Cave Ice Block in the Saarhalle Dachstein-Mammoth Cave (Mammuthöhle, Austria) based on <sup>3</sup>H and <sup>14</sup>C" @default.
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- W2895514860 doi "https://doi.org/10.1017/rdc.2018.96" @default.
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