CO2, 13C/12C and H2O variability in natural basaltic glasses: a study comparing stepped heating and ftir spectroscopic techniques |
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| Affiliation: | 1. Geosciences Research Division, Scripps Institution of Oceanography, UCSD, La Jolla, CA 92093-0244, USA;2. Department of Geology, Royal Holloway University of London, Egham, Surrey, TW20 0EX, UK;3. Division of Geological and Planetary Science, California Institute of Technology, Pasadena, CA 91125, USA;1. Division of Cardiothoracic Surgery, Medical University of South Carolina, Charleston, South Carolina;2. Division of Pulmonary Medicine, Medical University of South Carolina, Charleston, South Carolina;1. Institut de Physique du Globe de Paris - Sorbonne Paris Cité, UMR CNRS 7154, Université Paris Diderot, 1 Rue Jussieu, 75005, Paris, France;2. Marine Chemistry and Geochemistry, MS #25, Clark 421, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA;3. Department of Geology and Geophysics, Woods Hole Oceanographic Institution, 02543, Woods Hole, MA, USA;4. Institute of Earth Sciences, University of Lausanne, Géopolis Building, CH-1015 Lausanne, Switzerland;5. Department of Geosciences, Boise State University, 83725, Boise, ID, USA;6. Massachusetts Institute of Technology/Woods Hole Oceanographic Institution Joint Program in Oceanography, 02543, Woods Hole, MA, USA;7. Department of Geological Sciences, University of Idaho, 83844, Moscow, ID, USA;1. Center for Advanced Radiation Sources, The University of Chicago, Chicago 60637, USA;2. Hawaiian Volcano Observatory, US Geological Survey, Hawai’i National Park, HI 96718, USA;3. Department of Earth Science, Northeastern Illinois University, Chicago, IL 60625, USA;4. Department of Earth and Planetary Sciences, University of Tennessee, Knoxville, TN 37996, USA;5. Department of Earth Sciences, University of Oregon, Eugene, OR 97403, USA;1. ISTO, 7327 Université d''Orléans-CNRS-BRGM, 1A rue de la Férollerie, 45071 Orléans Cedex 2, France;2. Geosciences Research Division, Scripps Institution of Oceanography, UCSD, La Jolla, CA 92093-0244, USA;3. CNRS, UPR3079 CEMHTI, 1D Avenue de la Recherche Scientifique, 45071 Orléans Cedex 2, France;4. Department of Chemistry, École Normale Supérieure – PSL Research University, 24 rue Lhomond, 75005 Paris, France;5. Sorbonne Universités, UPMC Univ. Paris 06, PASTEUR, 75005 Paris, France;6. CNRS, UMR 8640 PASTEUR, 75005 Paris, France;7. Université de Nantes, Nantes Atlantique Universités, Laboratoire de Planétologie et Géodynamique de Nantes (LPGN) UMR CNRS 6112, France;8. Laboratoire de Physique Théorique de la Matière Condensée, Université Pierre et Marie Curie (Paris 6), UMR CNRS 7600, Case Courrier 121, 4 Place Jussieu, 75252 Paris Cedex 05, France;9. Mineralogy Department, GZG, Georg-August-University Göttingen, 37077 Göttingen, Germany |
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| Abstract: | A comparison of two independent techniques was used to assess the homogeneity of CO2 and H2O concentrations in a number of natural basaltic glasses. Variations in carbon concentration and isotopic ratio were determined by comparison of stepped heating data obtained in two different laboratories. Dissolved volatile concentrations were also obtained by stepped heating and Fourier Transform Infrared (FTIR) spectroscopy. Replicate stepped heating analyses of a mid-ocean ridge basaltic glass show that the concentration and 13C/12C of bulk magmatic and dissolved CO2 vary by less than ±10% and ±0.5‰, respectively. A similar degree of correlation is observed for replicate stepped heating analyses of Mariana Trough glasses conducted in two different laboratories. Dissolved CO2 concentrations determined by stepped heating also correlate well with concentrations measured by FTIR spectroscopy. The correspondence of results obtained in these experiments provide an upper limit to the degree of natural variation in concentrations and isotopic ratios of these volatiles in basaltic glasses and suggest that intrinsic, magmatic carbon has a relatively homogeneous distribution in these glasses. Water concentrations determined through extraction by heating and FTIR also show excellent agreement. |
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