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Experimental calibration of sapphirine–spinel Fe–Mg exchange thermometer: Implication for constraints on P–T condition of Howard Hills, Napier Complex, East Antarctica |
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| Authors: | Kei Sato Tomoharu Miyamoto Toshisuke Kawasaki |
| Institution: | aDepartment of Earth Sciences, Faculty of Science, Ehime University, Bunkyo-cho 2-5, Matsuyama 790-8577, Japan bResearch Center for the Evolving Earth and Planets, Department of Earth and Planetary Sciences, Faculty of Science, Tokyo Institute of Technology, Ookayama 2-12-1, Meguroku, Tokyo 152-8551, Japan cDepartment of Earth and Planetary Sciences, Faculty of Science, Kyushu University, Hakozaki 6-10-1, Fukuoka 812-8581, Japan |
| Abstract: | The Fe2+–Mg distribution coefficients between sapphirine and spinel:were experimentally determined at pressures of 9–13 kbar and temperatures of 950–1150 °C using a natural ultrahigh-temperature (UHT) granulite with paragenesis of these minerals from the Napier Complex in East Antarctica XMg = Mg / (Fe + Mg); XFe = Fe / (Fe + Mg)]. A new sapphirine–spinel geothermometer has been obtained as: We applied the exchange thermometer to UHT or high-grade metamorphic rocks that were reported from various complexes in the world. If the KD values of 2.63–4.34 obtained from low-Cr mineral pairs such as XCrSpr < 0.016 and XCrSpl < 0.047 were substituted into the equation, their temperature conditions would be estimated as 806–1050 °C at 11 kbar. The XCr means Cr / (Al + Cr(+ Fe3+)). These temperatures are reasonable retrograde or near peak metamorphic condition. |
| Keywords: | Fe2+–Mg partitioning Sapphirine–spinel exchange thermometer Ultrahigh-temperature (UHT) metamorphism Napier Complex East Antarctica |
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