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- W2004365789 abstract "Whereas the method based on the decrease of excess 210Pb has already been used to date young (< 120 yr) speleothems (e.g. [M. Baskaran, T. M. Iliffe, Age determination of recent cave deposits using excess 210Pb — A new technique, Geophys. Res. Lett. 20 (1993) 603–606.]), this paper presents the first dating of a speleothem through the 226Ra–210Pb method. Dating of a young hydrothermal stalagmite from the Mt Cornadore cave (St Nectaire, French Massif Central) was made possible by the high 226Ra and negligible 210Pb contents of such carbonates, formed by precipitation from CO2-rich thermal waters. (210Pb/226Ra) ratios regularly increase with depth along the axis of the 33 cm long stalagmite. The age–depth relationship can be interpreted by two main phases of growth, with high but variable axial growth rates of 5.3 mm/yr from 1909 to 1967, and 2.6 mm/yr from 1967 to 1989 (alternatively, the oldest phase can be subdivided in three episodes with growth rates varying from 2 to 7 mm/yr). Thin-section examination reveals the presence of numerous laminae, indicating infra-annual variations. We suggest that this fine layered structure might reflect short-term fluctuations in drip waters, possibly induced by near-surface mixing between thermal and ground waters, and ultimately linked to the pluviometry. A detailed examination of this laminated structure combined with 226Ra–210Pb dating could thus provide a high-resolution record of local paleohydrological fluctuations." @default.
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- W2004365789 date "2006-10-15" @default.
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- W2004365789 title "First 226Ra–210Pb dating of a young speleothem" @default.
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- W2004365789 doi "https://doi.org/10.1016/j.epsl.2006.06.012" @default.
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