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Mineral thermometry and the composition of fluids of the sodalite syenites of the Lovozero alkaline massif

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Abstract

In order to determine the conditions of mineral formation, a suite of sodalite syenite samples was investigated from the differentiated complex and in part from the eudialyte lujavrite complex of the Lovozero alkaline massif. The compositions of major and accessory minerals were analyzed using an electron microprobe. Various mineral geothermometers (Bt-Cpx, Amph-Cpx, and Amph-Bt) were applied to estimate the temperature of formation of clinopyroxene-bearing assemblages from the sodalite syenites. The temperature varied from ∼990 to 595–630°C, which reflects various stages of crystallization. The temperatures of formation of sodalite assemblages were estimated from the compositions of coexisting sodalite phases as 625–530°C and appeared to be in good agreement with estimates obtained by other mineral geothermometers. Based on the data on the composition and crystallization temperature of sodalites, the minimum concentration of salts (NaCl and Na2SO4) in the mineral-forming fluid was estimated as 10–20 wt % NaCl eq. for the two-sodalite assemblages and 1.5–3.0 wt % NaCl eq. for the nosean-bearing assemblages. The molar fraction of sulfur in the fluid was also estimated: 0.02 for the two-sodalite assemblages and 0.04–0.27 for the nosean-bearing assemblages.

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Authors and Affiliations

  1. Institute of Experimental Mineralogy, Russian Academy of Sciences, Chernogolovka, Moscow oblast, 142432, Russia

    N. I. Suk, A. R. Kotel’nikov & A. M. Koval’skii

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  1. N. I. Suk
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  2. A. R. Kotel’nikov
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  3. A. M. Koval’skii
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Correspondence to N. I. Suk.

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Original Russian Text © N.I. Suk, A.R. Kotel’nikov, A.M. Koval’skii, 2007, published in Petrologiya, 2007, Vol. 15, No. 5, pp. 474–492.

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Suk, N.I., Kotel’nikov, A.R. & Koval’skii, A.M. Mineral thermometry and the composition of fluids of the sodalite syenites of the Lovozero alkaline massif. Petrology 15, 441–458 (2007). https://doi.org/10.1134/S0869591107050025

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