A first last glacial maximum stalagmite record from southern Portugal

Veiga-Pires, C.; Ghaleb, Bassam; Hélie, Jean-François; Moura, Delminda; Luis, Joaquim; Hillaire-Marcel, C.

http://hdl.handle.net/10400.1/3236

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Abstract(s)

A newly launched research program permitted the sampling of speleothem deposits in the Algarve area (Southern Portugal). Unfortunately, this stalagmite yielded very small amounts of U (~ 20 ppb), making the setting of a U-series chronology difficult due to both the relative importance of a detrital contaminating fraction and the lack of precision on overall 230Th measurements. Nevertheless, based on the top and most recent sample, we extracted a first order estimate for the 230Th/232Th ratio of the contaminating fraction and for its 234U/232Th and 238U/232Th ratios as well, assuming a secular equilibrium between 234U and 238U in this fraction.

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http://hdl.handle.net/10400.1/3236

Citation

Veiga-Pires, Cristina Carvalho; Ghaleb, Bassam; Hélie, Jean-François; Moura, Delminda; Luis, Joaquim; Hillaire-Marcel, Claude. A first Last Glacial Maximum stalagmite record from southern Portugal, Trabalho apresentado em INQUA 2011, In INQUA2011, Bern, Swizerland, 2011.