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- W1514868449 abstract "Abstract The metamorphic evolution of a granulitized eclogite from Punta de li Tulchi, NE Sardinia, Italy, reconstructed utilizing a combined microstructural (symplectitic, coronitic and kelyphytic features) and thermodynamic approach, involved a complex metamorphic history with equilibrium attained only at a domainal scale. Microstructural analysis and mineral zoning allow recognition of reactants and products involved in successive balanced mineral reactions. The P–T conditions at which each microstructure was formed are constrained by calculating isochemical phase diagrams (pseudosections) for the composition of effectively reacting domains. A pre‐symplectite stage developed during prograde metamorphism under conditions ranging from 660–680 °C, 1.6–1.8 GPa to 660–700 °C at 1.7–2.1 GPa. Pseudosections calculated for subsequent clinopyroxene + plagioclase and orthopyroxene + plagioclase symplectitic coronae using the composition of effectively reacting microdomains suggest temperature in excess of 800 °C and pressures of 1.0–1.3 GPa. Modelling the development of later plagioclase + amphibole coronae around garnet during decompression yields conditions of 730–830 °C and 0.8–1.1 GPa. H 2 O (wt%) isomodes indicate that the granulitized eclogites were H 2 O‐undersaturated at peak‐ P conditions and during most of the subsequent heating and decompression. This allowed the preservation of prograde garnet zoning in spite of the strong granulite facies overprint. The P–T evolution of Punta de li Tulchi granulitized eclogite is very similar in shape to that registered by other NE Sardinia retrogressed eclogites thus suggesting a common tectonic scenario for their evolution." @default.
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- W1514868449 date "2012-07-12" @default.
- W1514868449 modified "2023-10-17" @default.
- W1514868449 title "Metamorphic evolution of non-equilibrated granulitized eclogite from Punta de li Tulchi (Variscan Sardinia) determined through texturally controlled thermodynamic modelling" @default.
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- W1514868449 doi "https://doi.org/10.1111/j.1525-1314.2012.00993.x" @default.
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