Constraining calcium isotope fractionation (delta Ca-44/40) in modern and fossil scleractinian coral skeleton
| Type | : | ACL |
|---|---|---|
| Nature | : | Production scientifique |
| Au bénéfice du Laboratoire | : | Oui |
| Statut de publication | : | Publié |
| Année de publication | : | 2013 |
| Auteurs (9) | : | PRETET C SAMANKASSOU E FELIS T REYNAUD S BÖHM F EISENHAUER A FERRIER-PAGÈS Christine GATTUSO Jean-pierre CAMOIN G |
| Revue scientifique | : | Chemical Geology |
| Volume | : | 340 |
| Fascicule | : | |
| Pages | : | 49-58 |
| DOI | : | 10.1016/j.chemgeo.2012.12.006 |
| URL | : | <go to isi>://wos:000319238900006 |
| Abstract | : | The present study investigates the influence of environmental (temperature, salinity) and biological (growth rate, inter-generic variations) parameters on calcium isotope fractionation (delta Ca-44/40) in scleractinian coral skeleton to better constrain this record. Previous studies focused on the delta Ca-44/40 record in different marine organisms to reconstruct seawater composition or temperature, but only few studies investigated corals. This study presents measurements performed on modern corals from natural environments (from the Maldives for modem and from Tahiti for fossil corals) as well as from laboratory cultures (Centre Scientifique de Monaco). Measurements on Porites sp., Acropora sp., Montipora verrucosa and Stylophora pistillata allow constraining inter-generic variability. Our results show that the fractionation of delta Ca-44/40 ranges from 0.6 to 0.1%., independent of the genus or the environmental conditions. No significant relationship between the rate of calcification and delta Ca-44/40 was found. The weak temperature dependence reported in earlier studies is most probably not the only parameter that is responsible for the fractionation. Indeed, sub-seasonal temperature variations reconstructed by delta O-18 and Sr/Ca ratio using a multi-proxy approach, are not mirrored in the coral's delta Ca-44/40 variations. The intergeneric variability and intrageneric variability among the studied samples are weak except for S. pistillate, which shows calcium isotopic values increasing with salinity. The variability between samples cultured at a salinity of 40 is higher than those cultured at a salinity of 36 for this species. The present study reveals a strong biological control of the skeletal calcium isotope composition by the polyp and a weak influence of environmental factors, specifically temperature and salinity (except for S. pistillate). Vital effects have to be investigated in situ to better constrain their influence on-the calcium isotopic signal. If vital effects could be extracted from the isotopic signal, the calcium isotopic composition of coral skeletons could provide reliable information on the calcium composition and budget in ocean. (c) 2012 Elsevier B.V. All rights reserved. |
| Mots-clés | : | Calcium isotopes Modem/fossil scleractinian corals Sea surface salinity Sea surface temperature Biomineralization sea-surface temperature reef-building corals planktonic-foraminifera stylophora-pistillata zooxanthellate coral hermatypic corals variability oxygen delta-o-18 salinity Geochemistry & Geophysics |
| Commentaire | : | ISI Document Delivery No.: 148IV Times Cited: 2 Cited Reference Count: 86 Pretet, Chloe Samankassou, Elias Felis, Thomas Reynaud, Stephanie Boehm, Florian Eisenhauer, Anton Ferrier-Pages, Christine Gattuso, Jean-Pierre Camoin, Gilbert Felis, Thomas/G-6670-2011 Felis, Thomas/0000-0003-1417-9657 Swiss National Science Foundation (SNF) [20MA21-115944, 200020_140618]; Deutsche Forschungsgemeinschaft (DFG) [FE 615/2-1]; European Community's Seventh Framework Programme (FP7) [211384] This research used samples provided by IODP, drilled on a mission-specific platform expedition conducted by the European Consortium for Ocean Research Drilling (ECORD) Science Operator (ESO). We would like to thank A. Kolevica (GEOMAR, Kiel, Germany) for technical support during calcium isotope measurements and B. Grobety (University of Fribourg, Switzerland) for XRD analyses. We acknowledge S. Rigaud and M. Gretz (University of Geneva, Switzerland) for logistic help in the field. This research was part of the European Science Foundation (FSF) EUROCORES Program EuroMARC supported by the Swiss National Science Foundation (SNF) through grants 20MA21-115944, and 200020_140618 and by the Deutsche Forschungsgemeinschaft (DFG) through grant FE 615/2-1. This work is a contribution to the 'European Project on Ocean Acidification' (EPOCA) which received funding from the European Community's Seventh Framework Programme (FP7/2007-2013) under grant agreement no. 211384. This manuscript was greatly improved by comments and suggestions from two anonymous reviewers. 2 Elsevier science bv Amsterdam Geochemistry & Geophysics |
| Tags | : | - |
| Fichier attaché | : | - |
| Citation | : |
Pretet C, Samankassou E, Felis T, Reynaud S, Böhm F, Eisenhauer A, Ferrier-Pagès C, Gattuso J-P, Camoin G (2013) Constraining calcium isotope fractionation (delta Ca-44/40) in modern and fossil scleractinian coral skeleton. Chem Geol 340: 49-58 | doi: 10.1016/j.chemgeo.2012.12.006
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