Lyell Collection
Geological Society, London, Special Publications
Lyell Centre  |   Lyell Collection  |   Subscriptions   |   Geological Society  |   Email alerts  |   Online bookshop  |   Help

Keywords:
Author:
Advanced search>>
This Article
Right arrow Full Text
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Right arrow Citation Map
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow Request Permissions
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Sato, K.
Right arrow Articles by Kawasaki, T.
Right arrow Search for Related Content
GeoRef
Right arrow GeoRef Citation
Geological Society, London, Special Publications; 2008; v. 308; p. 431-447;
DOI: 10.1144/SP308.22
© 2008 Geological Society of London

Articles

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

Kei Sato1, Tomoharu Miyamoto2 & Toshisuke Kawasaki3

1 Research Center for the Evolving Earth and Planets, Department of Earth and Planetary Sciences, Graduate School of Science and Engineering, Tokyo Institute of Technology, Ookayama 2-12-1, Meguro-ku Tokyo 152-8551, Japan (e-mail: ksato{at}geo.titech.ac.jp)
2 Department of Earth and Planetary Sciences, Faculty of Science, Kyushu University, Hakozaki 6-10-1, Fukuoka 812-8581, Japan
3 Department of Earth Sciences, Graduate School of Science and Engineering, Ehime University, Bunkyo-cho 2-5, Matsuyama 790-8577, Japan

Temperature dependence of the Fe2+–Mg exchange between orthopyroxene (Opx) and spinel (Spl),


Formula

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,


Formula

is empirically obtained as


Formula

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.





This article has been cited by other articles:


Home page
 Geological Society, London, Special PublicationsHome page
T. Kawasaki and Y. Osanai
Empirical thermometer of TiO2 in quartz for ultrahigh-temperature granulites of East Antarctica
Geological Society, London, Special Publications, 2008; 308: 419 - 430.
[Abstract] [Full Text] [PDF]