3 results on '"Klinkhammer, Gary"'
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2. Interlaboratory comparison study of calibration standards for foraminiferal Mg/Ca thermometry
- Author
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Greaves, Mervyn, Caillon, Nicolas, Rebaubier, Helene, Bartoli, G., Bohaty, Steven, Cacho, Isabel, Clarke, L., Cooper, M., Daunt, C., Delaney, M., de Menocal, P., Dutton, Andrea, Eggins, Stephen, Elderfield, Henry, Garbe-Schoenberg, Dieter, Goddard, Ethan, Green, D., Groeneveld, J., Hastings, D., Hathorne, E., Kimoto, K., Klinkhammer, Gary, Labeyrie, L., Lea, David W., Marchitto, Tom, Martínez Botí, M. A., Mortyn, P. Graham, Ni, Y., Nuernberg, D., Paradis, G., Pena, L., Quinn, T., Rosenthal, Y., Russell, A., Sagawa, T., Sosdian, S., Stott, L., Tachikawa, K., Tappa, E., Thunell, Robert C., Wilson, P. A., Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] (LSCE), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Paléocéanographie (PALEOCEAN), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Department of Stratigraphy Paleontology and Marine Geosciences, University of Barcelona, Leibniz-Institut für Meereswissenschaften (IFM-GEOMAR), DFG Research Center for Ocean Margins (RCOM), Universität Bremen, University of North Carolina [Charlotte] (UNC), University of North Carolina System (UNC), FOM Institute for Atomic and Molecular Physics (AMOLF), Centre européen de recherche et d'enseignement des géosciences de l'environnement (CEREGE), Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Collège de France (CdF)-Institut national des sciences de l'Univers (INSU - CNRS)-Aix Marseille Université (AMU)-Institut National de la Recherche Agronomique (INRA), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ), and Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Collège de France (CdF (institution))-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut National de la Recherche Agronomique (INRA)
- Subjects
Paleoceanography ,[SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph] ,[SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry ,Carbonates ,QE ,Mg/Ca thermometry ,Intercalibration ,Reference materials - Abstract
International audience; [1] 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.
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- 2008
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3. Post depositional alteration of foraminiferal shells in cold seep settings: New insights from flow-through time-resolved analyses of biogenic and inorganic seep carbonates
- Author
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Torres, Marta E., Martin, Ruth A., Klinkhammer, Gary P., and Nesbitt, Elizabeth A.
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METHANE , *CARBONATES , *PROTISTA , *GEODYNAMICS , *GEOCHEMISTRY , *SEDIMENTS , *HYDROCARBONS , *TIME-resolved spectroscopy ,GEOGRAPHICAL distribution of foraminifera - Abstract
Abstract: Transient hydrocarbon migration within a sediment package leaves behind robust geological signatures in the biogenic and authigenic carbonate record. Here we apply Flow-Through Time Resolved Analyses (FT-TRA) to unravel the compositional changes in foraminifera from coastal fossil methane seeps exposed from Oregon to Vancouver Island: The Eocene–Oligocene Keasey Formation, the Oligocene–Miocene Pysht and Sooke Formations, and the Pliocene Quinault Formation. Our data show that secondary mineralization can be traced with the use of Mg/Ca ratios, which in altered foraminifera are significantly higher than the biogenic ratio (<3 compared to values as high as 69mol/mol). Analogous to the record in authigenic carbonate, secondary mineralization contains valuable information about seep characteristics and their geologic history. Data from the Quinault Formation reflect the influence of anaerobic oxidation of biogenic methane in both bleb (δ13C: −29.8‰ to −14.0‰) and foraminiferal (δ13C: −43.0‰ to 2.0‰) carbonate. Oxygen isotopes from blebs and foraminifera indicate precipitation at bottom water temperatures in an environment comparable to conditions observed in modern seeps on the Oregon slope and elsewhere. The carbonates in these seeps are enriched in barium and strontium over biogenic values, and such elevated values may be used a diagnostic tool to identify methane-related carbonates. In contrast, in the Pysht and Sooke formations, carbonate precipitation (including secondary mineralization of foraminifera), was fueled by a thermogenic carbon source (δ13C: −14 to 3.4‰). These carbonates reflect a more complex paragenetic history and suggest alteration driven by post-depositional warm and/or meteoric fluids. The high manganese (up to 12mmol/mol in foraminifera and 60.1mmol/mol in a carbonate nodule) and low oxygen isotope values (δ18O as low as −7.7‰ in foraminifera and −11.6‰ in a carbonate pavement) observed for the Pysht and Sooke samples are consistent with carbonates recovered from fault zones on the Oregon slope, and suggest the intriguing possibility that these carbonates may reflect manganese-dependent anaerobic methane oxidation. [Copyright &y& Elsevier]
- Published
- 2010
- Full Text
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