Fe2+-Mg partitioning experiments between orthopyroxene and spinel using ultrahigh-temperature granulite from the Napier Complex, East Antarctica

Kei Sato, Tomoharu Miyamoto, Toshisuke Kawasaki

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Abstract

Temperature dependence of the Fe2+-Mg exchange between orthopyroxene (Opx) and spinel (Spl), was experimentally determined at 9-13 kbar and 900-1200 °C using an ultrahigh-temperature (UHT) granulite collected from the Napier Complex in Enderby Land, East Antarctica. The Fe2+-Mg distribution coefficient, is empirically obtained as where X is the cationic mole fraction, and pressure P and temperature T are in kbar and Kelvin, respectively. The new geothermometer was applied to various natural UHT and associated high-grade metamorphic rocks from East Antarctica and other regions of the world. The results indicate temperatures between 735 and 902 °C at pressures in the range of 5-14 kbar. This geothermometer utilizing spinel does not give peak metamorphic condition, because it is relatively easy for spinel to re-equilibrate during the cooling stage of metamorphism. Hence, we conclude that the geothermometer is suitable for evaluating the closure temperature for the KD between aluminous orthopyroxene and spinel during retrograde metamorphism rather than the thermal peak.

Original languageEnglish
Pages (from-to)431-447
Number of pages17
JournalGeological Society Special Publication
Volume308
DOIs
Publication statusPublished - Dec 1 2008

Fingerprint

granulite
orthopyroxene
spinel
partitioning
experiment
temperature
Experiments
Temperature
retrograde metamorphism
closure temperature
Metamorphic rocks
metamorphic rock
metamorphism
Antarctica
cooling
Cooling

All Science Journal Classification (ASJC) codes

  • Water Science and Technology
  • Ocean Engineering
  • Geology

Cite this

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title = "Fe2+-Mg partitioning experiments between orthopyroxene and spinel using ultrahigh-temperature granulite from the Napier Complex, East Antarctica",
abstract = "Temperature dependence of the Fe2+-Mg exchange between orthopyroxene (Opx) and spinel (Spl), was experimentally determined at 9-13 kbar and 900-1200 °C using an ultrahigh-temperature (UHT) granulite collected from the Napier Complex in Enderby Land, East Antarctica. The Fe2+-Mg distribution coefficient, is empirically obtained as where X is the cationic mole fraction, and pressure P and temperature T are in kbar and Kelvin, respectively. The new geothermometer was applied to various natural UHT and associated high-grade metamorphic rocks from East Antarctica and other regions of the world. The results indicate temperatures between 735 and 902 °C at pressures in the range of 5-14 kbar. This geothermometer utilizing spinel does not give peak metamorphic condition, because it is relatively easy for spinel to re-equilibrate during the cooling stage of metamorphism. Hence, we conclude that the geothermometer is suitable for evaluating the closure temperature for the KD between aluminous orthopyroxene and spinel during retrograde metamorphism rather than the thermal peak.",
author = "Kei Sato and Tomoharu Miyamoto and Toshisuke Kawasaki",
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T1 - Fe2+-Mg partitioning experiments between orthopyroxene and spinel using ultrahigh-temperature granulite from the Napier Complex, East Antarctica

AU - Sato, Kei

AU - Miyamoto, Tomoharu

AU - Kawasaki, Toshisuke

PY - 2008/12/1

Y1 - 2008/12/1

N2 - Temperature dependence of the Fe2+-Mg exchange between orthopyroxene (Opx) and spinel (Spl), was experimentally determined at 9-13 kbar and 900-1200 °C using an ultrahigh-temperature (UHT) granulite collected from the Napier Complex in Enderby Land, East Antarctica. The Fe2+-Mg distribution coefficient, is empirically obtained as where X is the cationic mole fraction, and pressure P and temperature T are in kbar and Kelvin, respectively. The new geothermometer was applied to various natural UHT and associated high-grade metamorphic rocks from East Antarctica and other regions of the world. The results indicate temperatures between 735 and 902 °C at pressures in the range of 5-14 kbar. This geothermometer utilizing spinel does not give peak metamorphic condition, because it is relatively easy for spinel to re-equilibrate during the cooling stage of metamorphism. Hence, we conclude that the geothermometer is suitable for evaluating the closure temperature for the KD between aluminous orthopyroxene and spinel during retrograde metamorphism rather than the thermal peak.

AB - Temperature dependence of the Fe2+-Mg exchange between orthopyroxene (Opx) and spinel (Spl), was experimentally determined at 9-13 kbar and 900-1200 °C using an ultrahigh-temperature (UHT) granulite collected from the Napier Complex in Enderby Land, East Antarctica. The Fe2+-Mg distribution coefficient, is empirically obtained as where X is the cationic mole fraction, and pressure P and temperature T are in kbar and Kelvin, respectively. The new geothermometer was applied to various natural UHT and associated high-grade metamorphic rocks from East Antarctica and other regions of the world. The results indicate temperatures between 735 and 902 °C at pressures in the range of 5-14 kbar. This geothermometer utilizing spinel does not give peak metamorphic condition, because it is relatively easy for spinel to re-equilibrate during the cooling stage of metamorphism. Hence, we conclude that the geothermometer is suitable for evaluating the closure temperature for the KD between aluminous orthopyroxene and spinel during retrograde metamorphism rather than the thermal peak.

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