Evidence that excess 210Pb flux varies with sediment accumulation rate and implications for dating recent sediments

Autor: José-María Abril, Gregg J. Brunskill
Rok vydání: 2014
Předmět:
Zdroj: Journal of Paleolimnology. 52:121-137
ISSN: 1573-0417
0921-2728
Popis: Most 210Pb dating models assume that atmospheric flux of excess 210Pb (210Pbexc) to the sediment–water interface remains constant over time. We revisited this assumption using statistical analysis of a database of laminated sediments and evaluated the implications for radiometric dating of recent deposits. A bibliographic survey enabled us to create a database with 10 annually laminated sediment cores from a variety of aquatic systems. The database has records of 210Pbexc flux, initial 210Pbexc activity, and sediment accumulation rate (SAR). 210Pbexc flux to sediments varied with time, and 1/3 of the data had relative deviations from the mean value >25 %. There was no statistically significant correlation between activities at the core top and SAR, whereas a statistically significant (p
Databáze: OpenAIRE
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