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Geological Society, London, Special Publications; 2008; v. 308; p. 391-399;
DOI: 10.1144/SP308.19
© 2008 Geological Society of London

Articles

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

Saori Goto & Takeshi Ikeda

Department of Earth and Planetary Sciences, Graduate School of Science, Kyushu University, 33 Hakozaki, Fukuoka 812-8581, Japan (e-mail: ikeda{at}geo.kyushu-u.ac.jp)

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.