Record number :
2291539
Title of article :
Stable isotopes and sclerochronology of the bivalve Mesodesma donacium: Potential application to Peruvian paleoceanographic reconstructions
Author/Authors :
Carré، نويسنده , , Matthieu and Bentaleb، نويسنده , , Ilhem and Blamart، نويسنده , , Dominique and Ogle، نويسنده , , Neil and Cardenas، نويسنده , , Freddy and Zevallos، نويسنده , , Sheyla and Kalin، نويسنده , , Robert M. and Ortlieb، نويسنده , , Luc and Fontugne، نويسنده , , Michel، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2005
Pages :
22
From page :
4
To page :
25
Abstract :
Reconstructing the past ENSO (El Niño 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 δ18O, we calculated a linear SST–fractionation relationship for the 14–20 °C range: T ( ° C ) = ( 17.41 ± 1.15 ) − ( 3.66 ± 0.16 ) ∗ ( δ 18 O arag./PDB − δ 18 O wat./SMOW ) . fference 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 °C precision using M. donacium archaeological shells from southern Peru, giving potential insights into the problem of past ENSO behaviour.
Keywords :
ENSO , stable isotopes , Peru , palaeoclimatology , Mollusc , sclerochronology
Journal title :
Palaeogeography, Palaeoclimatology, Palaeoecology
Serial Year :
2005
Link To Document :
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