TY - JOUR
T1 - RAMAN GEOBAROMETRY OF QUARTZ INCLUSIONS IN KYANITE
T2 - APPLICATION TO QUARTZ ECLOGITE FROM THE GONGEN AREA OF THE SANBAGAWA BELT, SOUTHWEST JAPAN
AU - Tomioka, Yuki
AU - Kouketsu, Yui
AU - Taguchi, Tomoki
N1 - Funding Information:
We deeply appreciate the constructive comments by T. Nishiyama and an anonymous reviewer, and editorial handling by L.A. Groat. We also thank K. Michibayashi and M. Enami for their constructive advice and other laboratory members for their helpful discussions. T. Taguchi acknowledges financial support from the Japan Society for the Promotion of Science (JSPS) (Grants 17J04059 and 19K04037).
Publisher Copyright:
© 2022 Mineralogical Association of Canada. All rights reserved.
PY - 2022/1
Y1 - 2022/1
N2 - Residual pressure values of quartz inclusions in host kyanite were estimated using Raman spectroscopy and show that the quartz-inclusions-in-kyanite system can be used as a geobarometer for estimating peak metamorphic conditions. Samples of quartz eclogite, a pelitic high-pressure metamorphic rock composed mainly of garnet, omphacite, and quartz, with subordinate kyanite, were obtained for analysis from the Gongen area in the Sanbagawa metamorphic belt, southwest Japan. Residual pressure in the 236 analyzed quartz inclusions within kyanite grains varies from 0.12 to 0.76 GPa. Values are independent of inclusion size and inclusion aspect ratio, and the distribution of residual pressure within the inclusions is homogeneous, except at inclusion-host interfaces. Numerical calculations based on elastic modeling with the equations of state of quartz and kyanite were applied using the highest residual pressure value of 0.76 GPa, with the calculated isopleth being consistent with previous results obtained by conventional thermodynamic geothermobarometry. We conclude that the quartz-inclusions-in-kyanite system can be used as a reliable new Raman geobarometer.
AB - Residual pressure values of quartz inclusions in host kyanite were estimated using Raman spectroscopy and show that the quartz-inclusions-in-kyanite system can be used as a geobarometer for estimating peak metamorphic conditions. Samples of quartz eclogite, a pelitic high-pressure metamorphic rock composed mainly of garnet, omphacite, and quartz, with subordinate kyanite, were obtained for analysis from the Gongen area in the Sanbagawa metamorphic belt, southwest Japan. Residual pressure in the 236 analyzed quartz inclusions within kyanite grains varies from 0.12 to 0.76 GPa. Values are independent of inclusion size and inclusion aspect ratio, and the distribution of residual pressure within the inclusions is homogeneous, except at inclusion-host interfaces. Numerical calculations based on elastic modeling with the equations of state of quartz and kyanite were applied using the highest residual pressure value of 0.76 GPa, with the calculated isopleth being consistent with previous results obtained by conventional thermodynamic geothermobarometry. We conclude that the quartz-inclusions-in-kyanite system can be used as a reliable new Raman geobarometer.
KW - Raman spectroscopy
KW - geobarometer
KW - kyanite
KW - quartz
KW - residual pressure
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U2 - 10.3749/canmin.2000097
DO - 10.3749/canmin.2000097
M3 - Article
AN - SCOPUS:85128456096
SN - 0008-4476
VL - 60
SP - 121
EP - 132
JO - Canadian Mineralogist
JF - Canadian Mineralogist
IS - 1
ER -