Age determination of recent cave deposits using excess Pb-210 - A new technique

Details Age determination of recent cave deposits using excess Pb-210 - A new technique Age determination of recent cave deposits using excess Pb-210 - A new technique

Apr 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20..603b&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 7, p. 603-606.

Physics

4

Calcite, Caves, Deposits, Paleoclimatology, Radioactive Age Determination, Chemical Analysis, Chemical Composition, Growth, Lead Isotopes, Oxygen Isotopes

Scientific paper

We show that speleothems contain high concentrations of excess Pb-210 and that this Pb-210 excess can be successfully employed to obtain growth rates of speleothems deposited during the last 100 years. Of two specimens analyzed, a tubular 'soda straw' stalactite yielded a longitudinal growth rate of 1.1 mm/yr, while a normal icicle-shaped stalactite had a lateral growth rate of 0.028 mm/yr. The mass growth rates of these two speleothems (149 and 78 mg/yr respectively) are comparable within a factor of two. Studies of fine-scale variations in the isotopic composition of recent speleothems will help to corroborate the validity of palaeoclimate records obtained using longer lived isotopes and extending back into Pleistocene.

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