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A periclase-dolomite-calcite carbonatite from the Oka complex, Quebec, and its calculated volatile composition

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Abstract

The eutectic mineral assemblage calcite-dolomite-periclase-apatite-forsterite-magnesioferrite-pyrrhotite-alabandite in a carbonatite dike within the Oka complex, Quebec, buffers the fugacities (and partial pressures) of all gas species in C-O-H-S-F, assuming vapor saturation. At the inferred eutectic (640° C, 1 kbar), the most important gas species and their partial pressures (bars) were: H2O, 882; CO2, 110; H2, 4.6; H2S, 2.7; CO, 0.5; and CH4, 0.1. Oxygen fugacity was near the QFM buffer, logf(O2)=−18.6, and sulfur fugacity was near the QFM-pyrrhotite buffer, logf(S2)=−5.9. Fluorine fugacity was low, logf(F2)=−43.9, consistent with the absence of fluoride minerals other than apatite. Presence of a water-rich gas phase is consistent with experiments on synthetic carbonatite systems (e.g. Fanelli et al. 1981), although compositions of the gas phase in published experiments cannot be determined exactly.

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  1. Allan H. Treiman

    Present address: Lunar and Planetary Laboratory, The University of Arizona, 85721, Tucson, AZ

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  1. Department of Geological Sciences, The University of Michigan, 48109, Ann Arbor, MI, USA

    Allan H. Treiman & Eric J. Essene

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  1. Allan H. Treiman
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Contribution no. 390 from the Mineralogical Laboratory, The University of Michigan

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Treiman, A.H., Essene, E.J. A periclase-dolomite-calcite carbonatite from the Oka complex, Quebec, and its calculated volatile composition. Contr. Mineral. and Petrol. 85, 149–157 (1984). https://doi.org/10.1007/BF00371705

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