Computer Science
Scientific paper
May 1964
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1964gecoa..28..717m&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 28, Issue 5, pp.717-729
Computer Science
21
Scientific paper
Water is practically omnipresent in the Earth's crust and graphite is very widespread in metamorphic rocks. This fact should be taken into consideration when we discuss the problem of oxidation and reduction in the Earth's crust. Normal aqueous fluid within the crust appears to have a composition deficient in oxygen as compared with pure water. Such composition would have been produced by equilibrium with graphite in most cases. The oxygen pressure in graphite-bearing rocks is a divariant function of temperature and carbon dioxide pressure. It follows then that if carbon dioxide pressure tends to be uniform throughout a metamorphic terrane, the oxygen pressure in graphite-bearing rocks tends to be uniform to the same degree at constant temperature. The true mobility of free oxygen may be very low, but its apparent mobility should be amplified by the widespread presence of graphite. Progressive metamorphism of pelitic rocks takes place essentially under the control of graphite.
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