Author： Abbott M.B. Stafford Jr T.W.
Publisher： Academic Press
ISSN： 0033-5894
Source： Quaternary Research, Vol.45, Iss.3, 1996-05, pp. : 300-311
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Abstract
The accuracy of Arctic lake chronologies has been assessed by measuring the 14 C activities of modern carbon sources and applying these isotopic mass balances to dating fossil lake materials. Small (<1 km 2 ) shallow (<25 m) Arctic lakes with watersheds <12 km 2 have soil and peat stratigraphic sections with 14 C activities ranging from 98 to 51% Modern. The 14 C activity of particulate organic carbon, dissolved organic carbon, and dissolved inorganic carbon from lake and stream waters ranges from 121 to 95% Modern. The sediment-water interface of the studied lakes shows consistent 14 C ages of =~1000 14 C yr, although the 14 C activity of living aquatic vegetation is 115% Modern. Radiocarbon measurements of components of the lacustrine carbon pool imply that the =~1000 14 C yr age of the sediment-water interface results from deposition of 14 C-depleted organic matter derived from the watershed.
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