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Correlation of boron isotopic composition with ultrastructure in the deep- sea coral Lophelia pertusa: Implications for biomineralization and paleo-pH
Provedor de dados: 5
Autores: Blamart, D.; Rollion-bard, C.; Meibom, A.; Cuif, J. -p.; Juillet-leclerc, A.; Dauphin, Y.
Using the CRPG-CNRS Cameca 1270 ion microprobe facility, we have measured boron isotopic compositions (B-11/B-10) in different ultrastructural components of the deep-sea aragonitic scleractinian coral Lophelia pertusa. We observe a systematic difference in B isotopic composition between the Early Mineralization Zone ( EMZ) and adjacent fibrous skeleton. In EMZ the measured delta(11) B values are consistently low. Fibrous aragonite is characterized by systematically higher delta(11) B values but also displays B isotopic heterogeneity associated with specific growth bands in the calyx wall. The magnitude of the observed B isotopic variations cannot be explained by changes in environmental conditions and is likely caused by biological processes involved in...
Tipo: Text
Palavras-chave: Boron isotopes; Deep-sea coral; Biomineralization; Aragonite; Microstructure; PH.
Ano: 2007
URL: https://archimer.ifremer.fr/doc/00235/34641/33060.pdf