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Petrogenetic Temperature Of The Oka Carbonatite
Friel, John J.
Friel, John J.
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Thesis/Dissertation
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1972
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Earth and Environmental Science
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http://dx.doi.org/10.34944/dspace/8387
Abstract
The Oka complex is a carbonatite and feldspathoidal silicate complex belonging to the alkaline intrusive suite of the Monteregian petrographic province. In order to learn more about the petrogenesis of this carbonatite, a temperature of 710 C was determined from the intersection of the fO2-T curves for the minerals: olivine, magnetite, latrappite. This is the temperature at which the minerals were last in oxygen equilibrium, and it is believed to be the original solidus. This temperature is in agreement with O18/O16 work (Conway and Taylor, 1969), and it is reasonable in light of Wyllie's work on synthetic systems (1966). Wyllie also found the presence of a liquid phase at these temperatures throughout a wide range of pressures, and therefore, the Oka carbonatite is believed to be of magmatic origin. The mineralogy and phase equilibria of the mineral, latrappite, are also studied, and some possible explanations for the problems associated with its crystal chemistry are discussed.
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