Publications des scientifiques de l'IRD

Soubiès François, Seidel A., Mangin A., Genty D., Ronchail J., Plagnes V., Hirooka S., Santos R. (2005). A fifty-year climatic signal in three Holocene stalagmite records from Mato Grosso, Brazil. Quaternary International, 135, p. 115-129. ISSN 1040-6182.

Titre du document
A fifty-year climatic signal in three Holocene stalagmite records from Mato Grosso, Brazil
Année de publication
2005
Type de document
Article référencé dans le Web of Science WOS:000228350100010
Auteurs
Soubiès François, Seidel A., Mangin A., Genty D., Ronchail J., Plagnes V., Hirooka S., Santos R.
Source
Quaternary International, 2005, 135, p. 115-129 ISSN 1040-6182
Three stalagmites were collected in the "Perolas" cave, 150 km NW of Cuiaba, Mato Grosso, Brazil, in order to reconstruct the climate history of the surrounding region. These stalagmites were similarly formed by stacking of thousands of calcitic pairs of laminae. Microphotographs of polished thin sections were used to count the laminae pairs and measure their width. A reasonable fit was found between the counting results and U/Th and C-14 geochronological data, proving that these pairs are annually deposited; and correlations were also found between the annual growth rate of the stalagmites and the annual water excess in the Perolas region, proving that the former parameter could be used as a climatic proxy. Three files of climatic proxy data covering 256 years were thus obtained and statistically treated to restore the historical fluctuations of the climate. Apart from well-documented periodicities, a still poorly known but very strong half-century climatic oscillation appeared in the results. (c) 2004 Published by Elsevier Ltd.
Plan de classement
Sciences du milieu [021] ; Géologie et formations superficielles [064]
Localisation
Fonds IRD [F B010042947]
Identifiant IRD
fdi:010042947
Contact