Physics
Scientific paper
May 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991e%26psl.104...89b&link_type=abstract
Earth and Planetary Science Letters, Volume 104, Issue 1, p. 89-98.
Physics
1
Scientific paper
Estimations of the oxidation state and development of ƒ;O2 during magmatic evolution are usually not possible because ƒ;O2 is a function of temperature (and pressure). If two independent equations for ƒ;O2 = ƒ;O2(T) can be obtained, ƒ;O2 and the corresponding temperature can be estimated.
For biotite-bearing rocks an estimation of ƒ;O2 (bio) can be combined with an estimation of ƒ;O2 (rock). This latter estimation requires an extrapolation of high-temperature data because low-temperature data are not available. The combination of the two equations provides a quadratic equation in T with the common (negative) solution: Tint=1/4c2{-k1-2c1-√[(k1+2c1)2+8c2k2]} which permits back calculation of ƒ;O2. The usefulness of the method is demonstrated for typical S-type, ilmenite, and I-type, magnetite granites from Australia. Two distinct oxidation states are obtained. It is suggested that the availability of H2O during granite emplacement largely determines ƒ;O2 conditions.
Present address: Department of Geochemistry, University of Utrecht, 3508 TA Utrecht, The Netherlands
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