Abstract
Abstract Garnet‐clinopyroxene‐quartz granulites of the central Highland Complex of Sri Lanka preserve textural and compositional features indicative of high‐pressure, ultrahigh‐temperature (HP‐UHT) crustal metamorphism and multistage retrogression. Grains of the peak metamorphic assemblage, garnet‐clinopyroxene‐quartz, are commonly separated and embayed by late orthopyroxene‐plagioclase symplectites; however, in some domains, rare grain‐to‐grain associations of the peak assemblages are still preserved. Thermodynamic modeling in the CaO‐Na2O‐K2O‐FeO‐MgO‐Al2O3‐SiO2 system indicates peak metamorphic conditions of 12.5 kbar at 925°C. The temperature estimates using garnet and clinopyroxene core compositions are in the range 844°–982°C, in agreement with the thermodynamic modeling. In conclusion, the textural, geochemical, and thermodynamic modeling and thermobarometric data indicate a multistage decompression after HP‐UHT metamorphism. U‐Pb zircon (laser ablation–inductively coupled plasma mass spectrometry) ...
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