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2002 Fiscal Year Final Research Report Summary

Residence time of magma within the magma chamber

Research Project

Project/Area Number 13640478
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Petrology/Mineralogy/Science of ore deposit
Research InstitutionKyoto University

Principal Investigator

SHIMOBAYASHI Norimasa  Kyoto Univ., Graduate School of Science, Associate Professor, 大学院・理学研究科, 助教授 (70235688)

Co-Investigator(Kenkyū-buntansha) MIYAKE Akira  Kyoto Univ., Graduate School of Science, Associate Professor, 大学院・理学研究科, 助手 (10324609)
Project Period (FY) 2001 – 2002
Keywordsmagma chamber / volcanic rock / pigeonite / plagioclase / microstructure / residence time / 噴火予知
Research Abstract

For the purpose of specifying the phenocrysts which were crystallized within the magma chamber before its eruption, we have been managing to observe and analyze a number of specimens from many volcanic localities, for example, Usu Miyake-jima, Sakura-jima, Funagata, and Takadate volcanoes and so on. The criteria are as follows, (1) the rock contains pigeonite phenocrysts, (2) the phenocrysts are surrounded by the overgrown rims, (3) the compositions of these overgrown rims and grains in groundmass are almost similar, and (4) the growth temperature of the core parts of these phenocrysts can be estimated with such as a pyroxene geothermometry. Unfortunately, however, no specimens but one can be found satisfying all of these criteria - the only one exceptional specimen is a tholeiitic basalt from the Kurohana area in Funagata volcano.
This sample has already been studied by us (Miyake & Shimobayashi, 2000), and we inferred that the phenocrysts of pyroxene and plagioclase crystallized at above 1200℃ in the magma chamber and that they were kept in the chamber less than half a year, which was determined on a basis of the coarsening kinetics of pigeonite-augite intergrowth. Another study (Yoshimura, private communication) using the same sample that we used, on the other hand the residence time in the chamber is estimated as 50-560 years based on a theory of crystal size distribution (CSD). In the present study, we minutely examined these two significantly different durations and considered that the latter duration (50-560 years) could be shortened to the value, which is not so largely inconsistent with ours. Consequently, we suggest that the CSD theory is very useful to estimate the residence time in the chamber even if the crystal growth rate in the chamber can be properly determined.

  • Research Products

    (13 results)

All Other

All Publications (13 results)

  • [Publications] Shimobayashi, N., Kitamura, M.: "Growth habit of needle crystals in coats of coated diamonds"Journal of Mineralogical and Petrological Sciences. 96・5. 186-194 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Shimobayashi, N., Miyake, A., Kitamura, M., Miura, E.: "Molecular dynamics simulations of the phase transformation between low-temperature and high-temperature clinoenstatites"Physics and Chemistry of Minerals. 28・9. 591-599 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Miyake, A., Shimobayashi, N., Miura, E., Kitamura, M.: "Molecular dynamics simulations of phase transition between high-temperature and high-pressure clinoenstatite"Physics of Earth and Planetary Interiors. 129・1. 1-11 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kawano, J., Shimobayashi, N., Kitamura, M., Shinoda, K., Aikawa, N.: "Formation process of calcium carbonate from highly supersaturated solution"Journal of Crystal Growth. 237-239. 419-423 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Ikeda, T., Shimobayashi, N., Wallis, S.R., Tsuchiyama, A.: "Crystallographic orientation, chemical composition and three-dimensional geometry of sigmoidal garnet : evidence for rotation"Journal of Structual Geology. 24・10. 1633-1646 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Asada, R., Shimobayashi, N., Kitamura, M.: "Equilibrium form of negative crystals in igneous quartz"Journal of Mineralogical and Petrological Sciences. 97・5. 59-69 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Shimobayashi, N. Kitamura, M.: "Growth habit of needle crystals in coats of coated diamonds"Journal of Mineralogical and Petrological Sciences. 96. 186-194 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Shimobayashi, N., Miyake, A., Kitamura, M. and Miura, E.: "Molecular dynamics simulations of the phase transformation between low-temperature and high-temperature clinoenstatites"Physics and Chemistry of Minerals. 28. 591-599 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Miyake, A., Shimobayashi, N., Miura, E. and Kitamura, M.: "Molecular dynamics simulations of phase transition between high-temperature and high-pressure clinoenstatite"Physics of Earth and Planetary. 129. 1-11 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kawano, J., Shimobayashi, N., Kitamura, M., Shinoda, K. and Aikawa, N.: "Formation process of calcium carbonate from highly supersaturated solution. Interiors"Journal of Crystal Growth. 237-239. 419-423 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Ikeda, T., Shimobayashi, N., Wallis, S. R. and Tsuchiyama, A.: "Crystallographic orientation, chemical composition and threedimensional geometry of sigmoidal garnet : evidence for rotation"Journal of Structual Geology. 24. 1633-1646 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Asada, R., Shimobayashi, N., and Kitamura, M.: "Equilibrium form of negative crystals in igneous quartz"Journal of Mineralogical and Petrological Sciences. 97. 59-69 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Matsumoto, M., Wallis, S. R., Aoya, M., Enami, M., Kawano, J., Seto, Y., and Shimobayashi, N.: "Petrological constraints on the formation conditions and retrograde P-T path of the Kotsu eclogite unit, central Shikoku"Journal of Metamorphic Geology. 21. 363-376 (2003)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2004-04-14  

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