Crystal size distribution of garnet in quartzo-feldspathic gneisses from the Lützow-Holm Complex at Skallen, East Antarctica

Saori Goto, Takeshi Ikeda

Research output: Contribution to journalArticle

Abstract

Crystal size distributions (CSDs) of garnet in quartzo-feldspathic gneisses from the Lützow-Holm Complex at Skallen, East Antarctica, indicate that significant annealing with Ostwald ripening did not take place even though the rocks underwent regional granulite-facies metamorphism with a peak phase of ultrahigh-temperature conditions. Absence of fluid as a result of the complete consumption of hydrous minerals during garnet-forming reactions could restrain intergranular diffusion and inhibit Ostwald ripening. Garnet-poor gneisses have experienced a single nucleation and growth event associated with a continuous garnet-forming reaction. In contrast, garnet-rich gneisses from the same outcrop have undergone additional garnet-forming reactions responsible for multiple stages of nucleation and growth.

Original languageEnglish
Pages (from-to)391-399
Number of pages9
JournalGeological Society Special Publication
Volume308
DOIs
Publication statusPublished - Dec 1 2008

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Garnets
garnet
crystal
Crystals
Ostwald ripening
ripening
nucleation
Nucleation
hydrous mineral
annealing
granulite facies
Antarctica
outcrop
metamorphism
Minerals
Rocks
Annealing
Fluids
fluid
rock

All Science Journal Classification (ASJC) codes

  • Water Science and Technology
  • Ocean Engineering
  • Geology

Cite this

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abstract = "Crystal size distributions (CSDs) of garnet in quartzo-feldspathic gneisses from the L{\"u}tzow-Holm Complex at Skallen, East Antarctica, indicate that significant annealing with Ostwald ripening did not take place even though the rocks underwent regional granulite-facies metamorphism with a peak phase of ultrahigh-temperature conditions. Absence of fluid as a result of the complete consumption of hydrous minerals during garnet-forming reactions could restrain intergranular diffusion and inhibit Ostwald ripening. Garnet-poor gneisses have experienced a single nucleation and growth event associated with a continuous garnet-forming reaction. In contrast, garnet-rich gneisses from the same outcrop have undergone additional garnet-forming reactions responsible for multiple stages of nucleation and growth.",
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AB - Crystal size distributions (CSDs) of garnet in quartzo-feldspathic gneisses from the Lützow-Holm Complex at Skallen, East Antarctica, indicate that significant annealing with Ostwald ripening did not take place even though the rocks underwent regional granulite-facies metamorphism with a peak phase of ultrahigh-temperature conditions. Absence of fluid as a result of the complete consumption of hydrous minerals during garnet-forming reactions could restrain intergranular diffusion and inhibit Ostwald ripening. Garnet-poor gneisses have experienced a single nucleation and growth event associated with a continuous garnet-forming reaction. In contrast, garnet-rich gneisses from the same outcrop have undergone additional garnet-forming reactions responsible for multiple stages of nucleation and growth.

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