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Application of densimetry using micro-Raman spectroscopy for CO (sub 2) fluid inclusions; a probe for elastic strengths of mantle minerals

Junji Yamamoto and Hiroyuki Kagi
Application of densimetry using micro-Raman spectroscopy for CO (sub 2) fluid inclusions; a probe for elastic strengths of mantle minerals
European Journal of Mineralogy (August 2008) 20 (4): 529-535

Abstract

Micro-Raman spectroscopy enables precise non-destructive analyses of CO (sub 2) density in a very small volume. By applying this method to CO (sub 2) fluid inclusions in minerals, a contrast is apparent in the CO (sub 2) density specific to mineral species in a mantle-derived spinel lherzolite xenolith entrained by ascending magma. The rock investigated in this study comprises four mineral species: olivine, orthopyroxene (opx), clinopyroxene (cpx), and chromianspinel (spinel). The CO (sub 2) densities in the fluid inclusions in these minerals are 1.006-1.035, 1.148-1.154, 1.150-1.154 and 1.189-1.194 g/cm (super 3) , respectively. During transport of the rock by magma and subsequent cooling, the CO (sub 2) fluid inclusions change their volume due to both elastic and plastic properties of the host mineral, which are sensitive to differential pressure between internal pressure of the CO (sub 2) fluid inclusion, and stress in surrounding crystal lattice. We tested the possibility that the volume of CO (sub 2) fluid inclusion changes by the differential pressure. Existing models dealing with the volume change of fluid inclusion in response to deformation of host mineral do not explain the density gradation, particularly that between pyroxenes and spinel. We propose that combination of precise determination of fluid density in mantle-derived minerals and observation of microstructure in the host mineral provides a deep insight into the deformation mechanism of natural minerals under high differential pressure and temperature.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 20
Serial Issue: 4
Title: Application of densimetry using micro-Raman spectroscopy for CO (sub 2) fluid inclusions; a probe for elastic strengths of mantle minerals
Affiliation: Woods Hole Oceanographic Institution, Woods Hole, MA, United States
Pages: 529-535
Published: 200808
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 32
Accession Number: 2008-114902
Categories: Igneous and metamorphic petrologyGeneral geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables
N37°00'00" - N83°00'00", W170°00'00" - E28°00'00"
Secondary Affiliation: University of Tokyo, JPN, Japan
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Schweizerbart'sche Verlagsbuchhandlung. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 200843
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