Retrograde methane-dominated fluid inclusions from high-temperature granulites of Rogaland, southwestern Norway

Details Retrograde methane-dominated fluid inclusions from high-temperature granulites of Rogaland, southwestern Norway Retrograde methane-dominated fluid inclusions from high-temperature granulites of Rogaland, southwestern Norway

Sep 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991gecoa..55.2533v&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 55, Issue 9, pp.2533-2544

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9

Scientific paper

Non-aqueous inclusions in the high-grade (800-1000°C; 4 kbar) metamorphic Rogaland region, southwestern Norway, consist of mixtures of CO 2 -CH 4 -N 2 . In particular the fluid inclusions in quartz veins in migmatites are characterized by high CH 4 concentrations and they were re-equilibrated at temperatures below 500°C during isobaric cooling. Observations by microthermometry demonstrated several complicated sequences of phase transitions, including partial and metastable homogenization (at lower temperature than melting), and S-L or S-V transitions. The phase behavior reflects a wide variation in composition and molar volume. Fluid compositions were measured by Raman microspectrometry. By this method, also small amounts of graphite have been detected in CO 2 -CH 4 inclusions. The instantaneous formation of graphite in a CO 2 -CH 4 inclusion by induction of the argon laser beam has been observed which points to the metastability of the CO 2 -CH 4 mixture. The calculated densities of the observed fluid mixtures are relatively low, necessitating a revision of the earlier interpretation of these inclusions as containing pure high-density fluids. Inclusions in quartz, trapped after the peak of metamorphism, record fluid heterogeneity which may present evidence for fluid-deficient metamorphism during the retrograde M 2 -M 3 metamorphism.

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