Phase equilibria in fluid inclusions from the Khtada Lake metamorphic complex

Details Phase equilibria in fluid inclusions from the Khtada Lake metamorphic complex Phase equilibria in fluid inclusions from the Khtada Lake metamorphic complex

Feb 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976gecoa..40..163h&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 40, Issue 2, pp.163-175

Computer Science

33

Scientific paper

The Khtada Lake. British Columbia, metamorphic complex consists of high grade amphibolite and metasedimentary units with development of gneiss, migmatite and homogeneous autochthonous plutons. Maximum metamorphic conditions are estimated to have exceeded 5 kbar and 700°C. Fluid inclusions in matrix quartz are highly variable in density and composition, ranging from apparently pure CO 2 (gas or liquid or both at room temperature) through CO 2 + H 2 O ± CH 4 mixtures to inclusions which are entirely aqueous. They occur along cracks, in groups without planar features and as isolated inclusions. The latter and some which occur in groups, are interpreted to most nearly approximate, in density and composition, the fluids present during the peak of metamorphism. The density and fluid composition data are derived from direct observations of phase changes between - 180 and + 380°C and from the application of published experimental data in the system CH 4 -CO 2 -H 2 O-NaCl. The most dense, pure CO 2 inclusions indicate a pressure of entrapment at 5 kbar, if a temperature of 700°C is assumed. This is in close agreement with the minimum P - T estimates from the mineral assemblages. Methane was positively identified in inclusions in graphite-bearing specimens. Salt content is concluded to be about 5-6 wt% NaCl equivalent in the aqueous phase in both aqueous and CO 2 + H 2 O inclusions. There is evidence of immiscible separation of CO 2 -rich and H 2 O-rich fluids at temperatures at least as high as 375°C.

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