Other
Scientific paper
Apr 1972
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1972gecoa..36..497e&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 36, Issue 4, pp.497-504
Other
10
Scientific paper
Previous phase equilibrium and oxygen isotopic researches on the high-pressure, low-temperature metamorphic rocks of the Franciscan and Sanbagawa blueschist type terranes have demonstrated the near ubiquity of a fluid at high ( total) pressure and its oxygen-rich nature during metamorphism. The coexistence of quartz with a CaCO 3 polymorph instead of wollastonite, and of sphene rather than rutile + quartz + calcium carbonate in these rocks places narrow, rather low limits on the partial pressures of CO 2 , as computed in this note; equilibrium calculations indicate that the mole fraction of carbon dioxide in the fluid must have been less than about 0.04 in the Sanbagawa terrane and less than 0.01 in the Franciscan terrane. The rocks are not sulfated or strongly oxidized, hence the only other likely component which could comprise the balance of this phase is H 2 O. Evidently metamorphism in the Sanbagawa belt and particularly in the Franciscan terrane must have taken place in the presence of a highly aqueous fluid.
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