Other
Scientific paper
Oct 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994gecoa..58.4465k&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 58, Issue 20, pp.4465-4473
Other
1
Scientific paper
Oxygen isotope distribution among rocks of different lithologies from one outcrop of the polymetamorphic Rayner Complex (East Antarctica) was used to estimate the "model temperatures" ( T m ), which correspond to the change of fluid behavior from the large-scale migration to small-scale exchange (open-system vs. closed-system) during waning stages of regional metamorphism T m are deduced assuming 1. (1) isotopically homogeneous fluid before isolation of a sample-scale system from its surroundings and 2. (2) mass-balance control of the fluid isotopic composition after the isolation. An estimated T m of about 720°C fits data on cationic geothermometers and equals the peak conditions of the "Major Rayner" event. Conventional oxygen geothermometry, applied to the same samples, gives equilibrium temperatures that are generally lower (down to 565°C), though the local-scale oxygen transport among minerals mostly caused disequilibrium in isotope distribution.
Krylov D. P.
Mineev Sergey D.
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