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Stable isotopes and sclerochronology of the bivalve Mesodesma donacium: Potential application to Peruvian paleoceanographic reconstructions

Carre, M. and Bentaleb, I. and Blamart, D. and Ogle, N. and Cardenas, F. and Zevallos, S. and Kalin, R.M. and Ortlieb, L. and Fontugne, M. (2005) Stable isotopes and sclerochronology of the bivalve Mesodesma donacium: Potential application to Peruvian paleoceanographic reconstructions. Palaeogeography, Palaeoclimatology, Palaeoecology, 228 (1-2). pp. 4-25.

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Reconstructing the past ENSO (El Nino Southern Oscillation) interannual variability requires very high resolution sea surface temperature (SST) proxies. In order to compensate for the lack of coral archive in the Eastern Pacific cold tongue, we studied the potentiality of the bivalve species Mesodesma donacium as a SST tracer for the Peruvian coast. Biomineralisation cycles and growth line formation in the shells are shown to be controlled by tides. The sclerochronology based on fortnightly cycles allowed us to compare local SST data with high resolution shell records. As a result of the high correlation between SST and aragonite delta(18)O, we calculated a linear SST-fractionation relationship for the 14-20 degrees C range: T(degrees C) = (17.41 +/- 1.15) - (3.66 +/- 0.16)* (delta(18)O(arag./PDB) - delta(18)O(wat./SMOW)). The difference from the commonly used Grossman and Ku (1986) [Grossman, E.L., Ku, T.L., 1986. Oxygen and carbon fractionation in biogenic aragonite: temperature effect. Chemical Geology 59, 59-74] equation suggests the potential existence of a species dependence of vital effect within bivalves. This preliminary equation allows monthly-scale SST reconstructions with a +/- 1.5 degrees C precision using M. donacium archaeological shells from southern Peru, giving potential insights into the problem of past ENSO behaviour. (c) 2005 Elsevier B.V. All rights reserved.

Item type: Article
ID code: 31917
Notes: Ocean Science Meeting of the American-Geophysical-Union, Portland, OR, 2004
Keywords: mollusc, sclerochronology, stable isotopes, palaeoclimatology, Peru, ENSO, Palaeontology, Ecology, Evolution, Behavior and Systematics, Earth-Surface Processes, Oceanography
Department: Faculty of Engineering > Civil and Environmental Engineering
Depositing user: Pure Administrator
Date Deposited: 27 Jun 2011 15:23
Last modified: 10 Dec 2015 20:10
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