Calculated mineral equilibria for eclogites in CaO–Na2O–FeO–MgO–Al2O3–SiO2–H2O: application to the Pouébo Terrane, Pam Peninsula, New Caledonia |
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| Authors: | Carson Powell & Clarke |
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| Institution: | Department of Geology and Geophysics, The University of Sydney, Sydney 2006, Australia, (*corresponding author,e-mail:;, School of Earth Sciences, The University of Melbourne, Parkville 3052, Australia, |
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| Abstract: | The high- P , medium- T Pouébo terrane of the Pam Peninsula, northern New Caledonia includes barroisite- and glaucophane-bearing eclogite and variably rehydrated equivalents. The metamorphic evolution of the Pouébo terrane is inferred from calculated P–T and P–T – X H2O pseudosections for bulk compositions appropriate to these rocks in the model system CaO–Na2O–FeO–MgO–Al2O3–SiO2–H2O. The eclogites experienced a clockwise P–T path that reached P ≈19 kbar and T ≈600 °C. The eclogitic mineral assemblages are preserved because reaction consequent upon decompression consumed the rocks' fluid. Extensive reaction occurred only in rocks with fluid influx during decompression of the Pouébo terrane. |
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| Keywords: | CNFMASH eclogites H2O availability New Caledonia pseudosections |
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