Interlaboratory comparison study of calibration standards for foraminiferal Mg/Ca thermometry
Greaves, Mervyn (University of Cambridge. Department of Earth Sciences)
Caillon, Nicolas (Centre National de la Recherche Scientifique (França))
Rebaubier, Helene (Centre National de la Recherche Scientifique (França))
Bartoli, G. (Kiel University. Institute für Geowissenschaften)
Bohaty, Steven (University of Southampton. School of Ocean and Earth Science)
Cacho, Isabel (Universitat de Barcelona. Departament d'Estratigrafia, Paleontologia i Geociències Marines)
Clarke, L. (Bangor University. School of Ocean Sciences)
Cooper, M. (National Oceanography Centre)
Daunt, C. (University of Cambridge. Department of Earth Sciences)
Delaney, M. (University of California. Department of Ocean Sciences)
de Menocal, P. (Columbia University. Lamont-Doherty Earth Observatory)
Dutton, Andrea (Australian National University. Research School of Earth Sciences)
Eggins, Stephen (Australian National University. Research School of Earth Sciences)
Elderfield, Henry (University of Cambridge. Department of Earth Sciences)
Garbe-Schoenberg, Dieter (Kiel University. Institute für Geowissenschaften)
Goddard, Ethan (University of South Florida. College of Marine Science)
Green, D. (National Oceanography Centre)
Groeneveld, J. (University of Bremen. Research Center Ocean Margins)
Hastings, D. (Eckerd College. Collegium of Natural Sciences)
Hathorne, E. (University of Bremen. Research Center Ocean Margins)
Kimoto, K. (Institute of Observational Research for Global Change)
Klinkhammer, Gary (Oregon State University. College of Oceanography)
Labeyrie, L. (Centre National de la Recherche Scientifique (França))
Lea, David W. (University of California. Department of Geological Sciences)
Marchitto, Thomas (University of Colorado. INSTAAR)
Martínez Botí, M. A. (Universitat Autònoma de Barcelona. Institut de Ciència i Tecnologia Ambientals)
Mortyn, P. Graham (Universitat Autònoma de Barcelona. Institut de Ciència i Tecnologia Ambientals)
Ni, Y. (Research Institute of Petroleum Exploration and Development)
Nuernberg, D. (IFM-GEOMAR (Kiel, Alemanya))
Paradis, G. (University of California. Department of Geological Sciences)
Pena, L. (Universitat de Barcelona. Departament d'Estratigrafia, Paleontologia i Geociències Marines)
Quinn, T. (University of South Florida. College of Marine Science)
Rosenthal, Y. (State University of New Jersey. Department of Geology)
Russell, A. (University of California. Department of Geology)
Sagawa, T. (Kochi University. Center for Advanced Marine Core Research)
Sosdian, S. (State University of New Jersey. Department of Geology)
Stott, Lowell D (University of South California. Department of Earth Sciences)
Tachikawa, K. (Centre National de la Recherche Scientifique (França))
Tappa, E. (University of South Carolina. Department of Geological Sciences)
Thunell, Robert C. (University of South Carolina. Department of Geological Sciences)
Wilson, P. A. (National Oceanography Centre)

Data:	2008
Resum:	An interlaboratory study of Mg/Ca and Sr/Ca ratios in three commercially available carbonate reference materials (BAM RS3, CMSI 1767, and ECRM 752-1) was performed with the participation of 25 laboratories that determine foraminiferal Mg/Ca ratios worldwide. These reference materials containing Mg/Ca in the range of foraminiferal calcite (0. 8 mmol/mol to 6 mmol/mol) were circulated with a dissolution protocol for analysis. Participants were asked to make replicate dissolutions of the powdered samples and to analyze them using the instruments and calibration standards routinely used in their laboratories. Statistical analysis was performed in accordance with the International Standardization Organization standard 5725, which is based on the analysis of variance (ANOVA) technique. Repeatability (RSDr%), an indicator of intralaboratory precision, for Mg/Ca determinations in solutions after centrifuging increased with decreasing Mg/Ca, ranging from 0. 78% at Mg/Ca = 5. 56 mmol/mol to 1. 15% at Mg/Ca = 0. 79 mmol/mol. Reproducibility (RSDR%), an indicator of the interlaboratory method precision, for Mg/Ca determinations in centrifuged solutions was noticeably worse than repeatability, ranging from 4. 5% at Mg/Ca = 5. 56 mmol/mol to 8. 7% at Mg/Ca = 0. 79 mmol/mol. Results of this study show that interlaboratory variability is dominated by inconsistencies among instrument calibrations and highlight the need to improve interlaboratory compatibility. Additionally, the study confirmed the suitability of these solid standards as reference materials for foraminiferal Mg/Ca (and Sr/Ca) determinations, provided that appropriate procedures are adopted to minimize and to monitor possible contamination from silicate mineral phases.
Drets:	Tots els drets reservats.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Mg/Ca thermometry ; Intercalibration ; Reference materials ; Paleoceanography ; Carbonates
Publicat a:	Geochemistry, geophysics, geosystems, Vol. 9, issue 8 (Aug. 2008) , p. 1-27, ISSN 1525-2027

DOI: 10.1029/2008GC001974

27 p, 2.2 MB

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