Mathematics – Logic
Scientific paper
Nov 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982e%26psl..61..143h&link_type=abstract
Earth and Planetary Science Letters, vol. 61, no. 1, Nov. 1982, p. 143-150.
Mathematics
Logic
12
Geotemperature, Igneous Rocks, Ilmenite, Petrology, Reaction Kinetics, Reduction (Chemistry), Barometers, Chemical Composition, Magnetite, Metamorphic Rocks, Planetary Evolution, Pressure Effects, Temperature Effects
Scientific paper
The petrogenesis of igneous and metamorphic rocks is a function of several parameters. Of these, temperature and pressure are of particular importance. Information concerning these two parameters is obtained through the use of mineral indicators. One such commonly used geothermometer/oxybarometer is that involving ilmenite/titano-magnetite. Anomalously low temperatures have been reported in cases in which the geothermometer/oxybarometer was employed. The studies suggest that low temperatures result from slow cooling rates which allows the Fe-Ti oxides to re-equilibrate. The current investigation is mainly concerned with the kinetics of the reduction of ilmenite-hematite solid solution, since this is the slower and, consequently, rate-controlling step in the re-equilibration process. The reaction rates determined for the reduction of ilmenites in the investigation are geologically rapid and must be considered when applying the considered geothermometer/oxybarometer.
Hammond P. A.
Taylor Lawrence A.
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