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Titanium in quartz as a record of ultrahigh-temperature metamorphism: the granulites of Karur, southern India

Published online by Cambridge University Press:  05 July 2018

K. Sato  and
M. Santosh
K. Sato*
Affiliation:
Research Center for the evolving Earth and Planets, also at Department of Earth andPlanetary Sciences, Graduate School of Science and Engineering, Tokyo Institute of Technology, Ookayama 2-12-1, Meguro-ku, Tokyo 152-8551, Japan
M. Santosh
Affiliation:
Department of Natural Environmental Science, Faculty of Science, Kochi University, Akebono-cho 2-5-1, Kochi 780-8520, Japan
*
*E-mail: [email protected]
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Abstract

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 secondcategory of quartz contains pure hematite inclusions. The rutile never coexists with the hematite inside the same quartz specimens. Fluidinclusions in the quartz are characterized as a CO2 + H2O mixture. Application of two geothermometric calibrations utilizing Ti in quartz yields minimum estimates of ~1190ºC, suggesting the formation of the rutile-quartz under UHT metamorphic condition. It is proposed that such Ti-rich quartz segregations couldbe another indicator for extreme crustal metamorphism at very high temperatures.

Keywords

rutile-quartzfluid inclusionshematiteLaser Raman spectroscopyultrahigh-temperature (UHT) metamorphismsouthern India.
Type
Research Article
Information
Mineralogical Magazine , Volume 71 , Issue 2 , April 2007 , pp. 143 - 154
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2007

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