Окислительно-Восстановительный РЕЖИМ ФОРМИРОВАНИЯ УЛЬТРАМАФИТОВ И ГАББРОИДОВ Йоко-Довыренского МАССИВА (ПО РЕЗУЛЬТАТАМ ИЗМЕРЕНИЙ СОБСТВЕННОЙ ЛЕТУЧЕСТИ КИСЛОРОДА В ОЛИВИНЕ), "Геохимия"

Арискин, А.А.; Фомин, И. С.; Жаркова, Е В; Калик, А. А.; Николаев, Г.С.

doi:10.7868/s0016752517070020

Геохимия

2017

DOI: 10.7868/s0016752517070020

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Окислительно-Восстановительный РЕЖИМ ФОРМИРОВАНИЯ УЛЬТРАМАФИТОВ И ГАББРОИДОВ Йоко-Довыренского МАССИВА (ПО РЕЗУЛЬТАТАМ ИЗМЕРЕНИЙ СОБСТВЕННОЙ ЛЕТУЧЕСТИ КИСЛОРОДА В ОЛИВИНЕ), "Геохимия"

А.А. Арискин¹,

И. С. Фомин²,

Е В Жаркова³

et al.

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2023

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Effect of Sulfide Sulfur on the Crystallization of Low-Alkali Magmas: Prolegomena

Nikolaev

2023

Geohimiâ

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The effect of sulfide sulfur on the crystallization of ultramafic–mafic–intermediate magmatic systems is considered in order to assess its scale and direction during the crystallization of rock-forming phases. The study carried out a theoretical analysis of the effect of sulfur on the activity of the components of the silicate melt according to the Korzhinskii’s principle of acid–base interaction. To test the theoretical constructions, published experimental data analyzed to select data allowing a direct comparison of sulfur-saturated and sulfur-free runs. Despite the very limited number of such experiments, they all fit well with theoretically predicted trends. It has been established that the addition of sulfur to the system moderately reduces the liquidus temperature of rock-forming minerals within 20–30°C, and significantly affects their composition. In particular, chrome spinel is enriched in chromium by 10–12 mol % and complementary depleted in aluminum. The composition of plagioclase is enriched in the anorthite component by 3 mol % in dacites and 8 mol % in andesites; this effect was not established in basalts, but its strengthening can be expected. Olivine and orthopyroxene demonstrate an insignificant increase in magnesian content, but the field of their coexistence is significantly reduced in favor of orthopyroxene, which should inevitably lead to a change in their cotectic and peritectic proportions. Natural observations that can be interpreted as the result of the sulfur effect are taken from publications. The results obtained lead to the conclusion that sulfur significantly affects the crystallization of silicate magmas. It follows that the petrological dependences calibrated for sulfur-free experiments should be applied with caution to the interpretation of sulfur-bearing systems.

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Effect of Sulfide Sulfur on the Crystallization of Low-Alkali Magmas: Prolegomena

Nikolaev

2023

Geohimiâ

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Updated COMAGMAT-5: Modeling the Effects of Sulfide Precipitation in Parallel to Crystallization Of Alumino-Chromian Spinel

Ariskin,

Bychkov,

Nikolaev

et al. 2023

Petrologiâ

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An updated version of the COMAGMAT-5.3 program is presented, which enables simulations of the silicate-sulfide immiscibility in parallel to crystallization of Al-Cr spinel and other rock-forming minerals. Main changes include a completed recalibration of the previous Fe-Ni sulfide solubility model (Ariskin et al., 2013) and incorporation of equations describing spinel-melt equilibria in a wide range of magmatic systems (Nikolaev et al., 2018а, 2018b). This allowed us to specify more accurately the link between compositions of immiscible sulfides and magma crystallization temperatures, as well as to correct partitioning of alumina between the model spinel and crystallizing melt. The updated COMAGMAT-5.3 can be used for calculations of the crystallization of basaltic to komatiitic magmas, as well as the history of solidification of mafic to ultramafic cumulates, including relative proportions of Al-Cr spinel and immiscible sulfides. Application example includes solidification of sulfide-bearing primitive olivine cumulate from the endocontact of the Yoko-Dovyren intrusion in Northern Transbaikalia (Russia). It is established that maximum crystallization proportions of Al-Cr spinel as much as 3.5 wt % are observed at Ol-Spl cotectic, following an abrupt decrease to slightly negative values during crystallization of plagioclase-bearing assemblages. This results in the inflection point on the trend of evolution of the spinel compositions, which changes from descending the Cr/Al ratio in the field of olivine to its increase when plagioclase starts to crystallize. As compared to previous version COMAGMAT-5.2, the updated model predicts somewhat higher proportions of precipitated sulfides.

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Cited by 2 publications

References 15 publications

Effect of Sulfide Sulfur on the Crystallization of Low-Alkali Magmas: Prolegomena

Effect of Sulfide Sulfur on the Crystallization of Low-Alkali Magmas: Prolegomena

Updated COMAGMAT-5: Modeling the Effects of Sulfide Precipitation in Parallel to Crystallization Of Alumino-Chromian Spinel

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