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CO_2, ^(13)C/^(12)C and H_2O variability in natural basaltic glasses: a study comparing stepped heating and ftir spectroscopic techniques

Macpherson, Colin G. and Hilton, David R. and Newman, Sally and Mattey, David P. (1999) CO_2, ^(13)C/^(12)C and H_2O variability in natural basaltic glasses: a study comparing stepped heating and ftir spectroscopic techniques. Geochimica et Cosmochimica Acta, 63 (11-12). pp. 1805-1813. ISSN 0016-7037. doi:10.1016/s0016-7037(99)00124-6. https://resolver.caltech.edu/CaltechAUTHORS:20181016-153903360

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Abstract

A comparison of two independent techniques was used to assess the homogeneity of CO_2 and H_2O 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 ^(13)C/^(12)C of bulk magmatic and dissolved CO_2 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 CO_2 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.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1016/s0016-7037(99)00124-6DOIArticle
ORCID:
AuthorORCID
Newman, Sally0000-0003-0710-995X
Alternate Title:CO2, 13C/12C and H2O variability in natural basaltic glasses: a study comparing stepped heating and ftir spectroscopic techniques
Additional Information:© 1999 Elsevier. (Received June 10, 1998; accepted in revised form March 16, 1999) We thank John Pace for construction of the La Jolla stepped heating system, and Professor Mark Thiemens and Joel Savarino (UCSD Chemistry) for access to, and assistance with, cross calibration of our manometric measurement system. Professor Kurt Marti and Dr. Thomas Graf (UCSD Chemistry) gave advice on the construction of a high temperature resistance furnace. Professor Martin Wahlen and Dr. Bruce Deck (SIO) are thanked for allowing us to use their quadrupole and gas source mass spectrometers. Samples were provided by Professors Peter Stoffers (Kiel), as part of an on-going study of Mariana Trough basalts, and Harmon Craig (SIO). This contribution benefited from thoughtful reviews by Drs. Jackie Dixon and Françoise Pineau. Work in La Jolla was supported by SIO “startup” funds to DRH. The stable isotope laboratory at RHUL is part-funded by the University of London as an Intercollegiate Analytical Facility.
Funders:
Funding AgencyGrant Number
Scripps Institution of OceanographyUNSPECIFIED
University of LondonUNSPECIFIED
Issue or Number:11-12
DOI:10.1016/s0016-7037(99)00124-6
Record Number:CaltechAUTHORS:20181016-153903360
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20181016-153903360
Official Citation:Colin G Macpherson, David R Hilton, Sally Newman, David P Mattey, CO2, 13C/12C and H2O variability in natural basaltic glasses: a study comparing stepped heating and ftir spectroscopic techniques, Geochimica et Cosmochimica Acta, Volume 63, Issues 11–12, 1999, Pages 1805-1813, ISSN 0016-7037, https://doi.org/10.1016/S0016-7037(99)00124-6. (http://www.sciencedirect.com/science/article/pii/S0016703799001246)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:90298
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:22 Oct 2018 16:02
Last Modified:16 Nov 2021 03:31

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