EarthRef.org Reference Database (ERR) -- Fudali 1965

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Fudali 1965

Fudali, R.F. (1965). Oxygen fugacities of basaltic and andesitic magmas. Geochimica et Cosmochimica Acta 29(9): 1,063-1,075.

Experimentally determined oxygen fugacities in equilibrium with the original ferric iron ratios of 9 basalts and andesites range from 10 (super -8.5) to 10 (super -6.4) atm at 1,200 degrees C. The O (sub 2) fugacity tends to increase with increasing acidity. Theoretical calculations of equilibrium of these oxygen fugacities give results reasonably close to actual values for runs in the 10 (super -6) -10 (super -8) range, but are in substantial error for runs made in air atmosphere. It is deduced that if oxygen fugacity is important in controlling the differentiation trend of rocks of the Cascade province, the mechanism must operate in the range 10 (super -9) -10 (super -6.5) atm.

Keywords
andesites; Basalt and andesite; basalts; fugacity; geochemistry;, igneous rocks; oxygen; oxygen fugacity; thermodynamic properties;, volcanic rocks, 02, Geochemistry

Journal
Geochimica et Cosmochimica Acta
http://www.elsevier.com/wps/product/cws_home/212

Publisher
Elsevier Science
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