Ultrahigh-temperature metamorphism of the Southern Marginal Zone of the Archean Limpopo Belt, South Africa

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概要

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• We report ultrahigh-temperature (T > 950°C) peak metamorphic conditions for the Southern Marginal Zone of the Archean Limpopo Belt in South Africa. Pelitic granulites of the zone have a typical mineral assemblage of garnet + biotite + orthopyroxene + cordierite + quartz + K-feldspar + plagioclase ± sillimanite, to which the latest geothermobarometers are applicable. The revised P-T conditions were obtained from a ternary feldspar geothermometer using antiperthitic feldspars in leucocratic granulite (920-980°C), Al solubility in orthopyroxene in pelitic granulite (970-1020°C), and a revised garnet-orthopyroxene geothermometer corrected for retrograde Fe-Mg exchange (920-990°C). The estimated peak temperature of metamorphism is about 100°C higher than previously estimated based on conventional Fe-Mg exchange geothermometers (800-870°C), and indicates a high geothermal gradient of ∼35°C/km in Archean continental lower crust.

• 日本鉱物科学会の論文
• 2004-08-01

著者

• Van Reenen

  Rand Afrikaans Univ. Zaf

• TSUNOGAE Toshiaki

  Institute of Geoscience, University of Tsukuba

• Tsunogae Toshiaki

  Institute Of Geoscience University Of Tsukuba

• Tsunogae Toshiaki

  Institute Of Geoscience The University Of Tsukuba

• Miyano Takashi

  Institute Of Geoscience University Of Tsukuba

• VAN REENEN

  Department of Geology, Rand Afrikaans University

• SMIT C.

  Department of Geology, Rand Afrikaans University

• Van Reenen

  Department Of Geology Rand Afrikaans University

• Smit C.

  Department Of Geology Rand Afrikaans University

• Miyano Takashi

  Institute Of Geosciece The University Of Tsukuba

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