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Development of a Liquidus Thermobarometer to Model the Olivine–Melt Equilibrium

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Abstract—

An equation system of an olivine-silicate melt liquidus thermobarometer has been obtained by processing the sampling set of 772 experimental equilibria of olivine crystals with basic melts by multidimensional statistics methods. The equations reproduce the experimental data with a small error in a wide basic composition range (from komatiites to dacites) at a temperature of 1040–1500°С and a pressure of 1–30 kbar. According to the thermobarometer testing results, the deviation of the calculated liquidus temperatures from experimental values does not exceed ±3°C in most of the temperature range.

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ACKNOWLEDGMENTS

We are grateful to S.P. Krasheninnikov (Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences) for useful advice and comments. We thank A.A. Ariskin (Moscow State University), G.S. Barmina and G.S. Nikolaev (Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences) for developing the INFOREX database, which made our research much less complicated.

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  1. Department of Geology, Moscow State University, 119991, Moscow, Russia

    E. V. Koptev–Dvornikov & D. A. Bychkov

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  1. E. V. Koptev–Dvornikov
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  2. D. A. Bychkov
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Correspondence to E. V. Koptev–Dvornikov.

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Translated by E. Maslennikova

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Koptev–Dvornikov, E.V., Bychkov, D.A. Development of a Liquidus Thermobarometer to Model the Olivine–Melt Equilibrium. Moscow Univ. Geol. Bull. 74, 592–605 (2019). https://doi.org/10.3103/S0145875219060036

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  • DOI: https://doi.org/10.3103/S0145875219060036

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