Host: The Japanese Association of Mineralogists, Petrologists and Economic Geologists
The Kodaikanal region of Madurai Block in southern India exposes a vast segment of high-grade metamorphic rocks dominated by Al-rich migmatite suite, designated herein as the Kodaikanal Metapelite Belt (KMB). The peak metamorphic assemblage is considered to be garnet-spinel-cordierite-quartz, which indicates possible pressure-temperature conditions of 900 °C at 7-8 kbar based on petrogenetic grid considerations. We show that the evidence for extreme crustal metamorphism at ultrahigh-temperature (UHT) conditions in granulite facies rocks can be extracted even if they lack typical UHT mineral assemblages due to bulk chemical constraints.
