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Estimation of CO (sub 2) content in the gas phase of melt inclusions using Raman spectroscopy; case study of inclusions in olivine from the Karymskiy Volcano (Kamchatka)

N. L. Mironov, D. P. Tobelko, S. Z. Smirnov, M. V. Portnyagin and S. P. Krasheninnikov
Estimation of CO (sub 2) content in the gas phase of melt inclusions using Raman spectroscopy; case study of inclusions in olivine from the Karymskiy Volcano (Kamchatka)
Russian Geology and Geophysics (May 2020) 61 (5-6): 600-610

Abstract

Carbon dioxide (CO (sub 2) ) is one of the main volatile components of natural magmas, but estimation of its initial contents remains a challenge. Study of melt inclusions in minerals permits a direct estimation of the content of CO (sub 2) in the melts. For the precise determination of its content in melt inclusions, it is necessary to analyze the contents of CO (sub 2) both in glass and in the fluid daughter phase of the inclusions. In this work, we constructed a calibration dependence of the density of CO (sub 2) in the range 0.01-0.22 g/cm3 on the distance between its characteristic peaks in Raman spectra (Fermi diads). The accuracy of density determination is + or -0.03 g/cm3. The calibration plot was used to estimate the density of CO (sub 2) in the gas phase of melt inclusions in magnesian olivine (Fo84.8-88.5) from basalts of the Karymskii Volcano, eastern Kamchatka. The estimated density was 0.03-0.21 g/cm3. Using these values, we have first evaluated the minimum initial content of CO (sub 2) in the parental magmas of the Karymskii Volcano, 0.45 wt.%. These data, along with the known initial content of water ( approximately 4.5 wt.%), indicate that the parental magmas began to crystallize at a pressure of at least 7 kbar (depth of >25 km). To increase the reliability of the above method of estimation of the CO (sub 2) content in the gas phase of olivine-hosted melt inclusions, we propose to carry out preliminary experimental reheating of inclusions for the complete homogenization of the fluid phase and determination of the 3D size of melt inclusions. The performed study provides a reliable evaluation of the content of CO (sub 2) in parental magmas, the depth of crystallization, and the degree of magma degassing and permits a comparison of the compositions of magmatic fluids and high-temperature volcanic gases.


ISSN: 1068-7971
Serial Title: Russian Geology and Geophysics
Serial Volume: 61
Serial Issue: 5-6
Title: Estimation of CO (sub 2) content in the gas phase of melt inclusions using Raman spectroscopy; case study of inclusions in olivine from the Karymskiy Volcano (Kamchatka)
Affiliation: Russian Academy of Sciences, Vernadsky Institute of Geochemistry and Analytical Chemistry, Moscow, Russian Federation
Pages: 600-610
Published: 202005
Text Language: English
Publisher: Allerton Press, New York, NY, United States
References: 45
Accession Number: 2020-084356
Categories: Igneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables
N54°04'00" - N54°06'00", E159°20'60" - E159°22'60"
Secondary Affiliation: Russian Academy of Sciences, V. Sobolev Institute of Geology and Mineralogy, RUS, Russian FederationGEOMAR Helmholtz Centre for Ocean Research Kiel, DEU, Germany
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2020, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 2020
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