High-temperature dehydration melting and decompressive P-T path in a granulite complex from the Eastern Ghats, India

摘要: The granulite complex of Paderu, in the south central sector Eastern Ghats belt, India, consists closely related pelitic granulites and peraluminous granitoids which could be linked via dehydration melting greywacke-like precursors. granulites, including high-Mg-Al sapphirine with early deformation microstructures, also record a high-temperature decompression from ~10 to ~8 kbar at ~1,000 °C, preceding isobaric cooling above 900 ~600 °C 8 kbar. Highly magnesian biotite presence spinel some granitoids, two distinct compositions, namely granite quartz-monzonite, all suggest highly Moreover, precursors is indicated by migmatitic spinel-bearing layers which, besides having significant abundance quartz feldspar, contain aluminous orthopyroxene cordierite. These reactions, occurring 9 kbar, may constrain prograde arm P–T trajectory. This constitute clockwise path. path consistent tectonic model crustal thickening metamorphism belt interpreted as result homogeneous shortening compressional setting.