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Mineralogical Magazine; April 2007; v. 71; no. 2; p. 143-154; DOI: 10.1180/minmag.2007.071.2.143
© 2007 Mineralogical Society of Great Britain and Ireland
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Titanium in quartz as a record of ultrahigh-temperature metamorphism: the granulites of Karur, southern India

K. Sato1,* and M. Santosh2

1 Research Center for the evolving Earth and Planets, also at 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
2 Department of Natural Environmental Science, Faculty of Science, Kochi University, Akebono-cho 2-5-1, Kochi 780-8520, Japan

* E-mail: ksato{at}geo.titech.ac.jp

The occurrence is reported of spectacular oriented needles of rutile within quartz veins and pods in granulite-facies rocks that have undergone partial melting under ultrahigh-temperature (UHT) conditions in the Karur region in southern India. Laser Raman spectroscopy and electron microprobe analysis confirm that (1) the mineral inclusions within quartz are pure rutiles, and (2) a second category of quartz contains pure hematite inclusions. The rutile never coexists with the hematite inside the same quartz specimens. Fluid inclusions in the quartz are characterized as a CO2 + H2O mixture. Application of two geothermometric calibrations utilizing Ti in quartz yields minimum estimates of ~1190°C, suggesting the formation of the rutile-quartz under UHT metamorphic condition. It is proposed that such Ti-rich quartz segregations could be another indicator for extreme crustal metamorphism at very high temperatures.

KEYWORDS: rutile-quartz, fluid inclusions, hematite, Laser Raman spectroscopy, ultrahigh-temperature (UHT) metamorphism, southern India






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