Prograde and retrograde hogbomites in sapphirine + quartz bearing Mg-Al rock from the Palghat-Cauvery Suture Zone, southern India

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概要

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• We report rare högbomite in a sapphirine + quartz bearing Mg-Al rock from the Palghat-Cauvery Suture Zone (PCSZ), the trace of the Cambrian Gondwana suture in southern India. Fine-grained (∼ 0.8 mm) högbomite occurs mantled by sapphirine and spinel with or without rutile, and the entire assemblage is included within poikiloblastic garnet. The microstructure suggests the progress of a possible prograde reaction; Grt + Hög → Spr + Spl + Rt + H2O. As the garnet hosting högbomite also includes equilibrium sapphirine + quartz, the högbomite probably underwent T > 1000 °C peak metamorphism, in which case this the first report of this mineral formed under ultrahigh-temperature conditions. On the other hand, coarse-grained (∼ 12 mm) högbomite, which is slightly richer in Fe + Mg (6.7-6.9 pfu) and poor in Al (14.5-14.7 pfu) than the former type (6.4-6.6 and 14.7-15.0 pfu, respectively), occurs in the matrix around spinel and/or sapphirine. The texture suggests retrograde formation of the latter högbomite.

• 2009-10-01

著者

• TSUNOGAE Toshiaki

  Graduate School of Life and Environmental Sciences (Earth Evolution Sciences), University of Tsukuba

• DUBESSY Jean

  G^2R(UMR 7566), Nancy Universite and CNRS

• Santosh M.

  Faculty of Science, Kochi University

• Dubessy Jean

  G^2r(umr 7566) Nancy Universite And Cnrs

• Santosh M.

  Dep. Of Natural Environmental Sci. Fac. Of Sci. Kochi Univ.

• Santosh M.

  Department Of Natural Environmental Science Faculty Of Science Kochi University

• NISHIMIYA Yuki

  Graduate School of Life and Environmental Sciences, University of Tsukuba

• CHETTY T.

  Geological Studies Division, National Geophysical Research Institute

• Tsunogae Toshiaki

  Graduate School Of Life And Environmental Sciences University Of Tsukuba

• Tsunogae Toshiaki

  Dep. Of Geology Univ. Of Johannesburg

• Tsunogae Toshiaki

  Graduate School Of Life And Environmental Sciences (earth Evolution Sciences) Univ. Of Tsukuba

• Chetty T.

  Geological Studies Division National Geophysical Research Institute

• Nishimiya Yuki

  Graduate School Of Life And Environmental Sciences University Of Tsukuba

• Santosh M.

  Department Of Geosciences Faculty Of Science Osaka City University:centre For Earth Science Studies

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