Abstract—
In the second part of this study, we analyze how crystallization differentiation can affect concentrations of elements and their ratios in melt inclusions and glasses of rocks in major geodynamic environments. The paper presents analysis of experimental data on the partition coefficient of elements between minerals (olivine, pyroxenes, garnet, amphibole, biotite, sulfide, apatite, spinel, ilmenite, rutile, and zircon) and silicate melts, which were discussed in the first part of this study. It is demonstrated that the crystallization of major minerals only insignificantly affects the ratios of incompatible elements. The partition coefficients of some elements between accessory minerals and melts can be very high, but the effects of crystallization differentiation cannot be significant because of the small amounts of the crystallizing phases. These effects are the most significant for chalcophile elements (Cu, Ni, and others), at the separation of sulfides, and for Nb and Ta, at the crystallization of rutile. Differences in concentrations of various elements and their ratios to Cs concentrations are discussed with reference to various geodynamic environments. The maximum values of the ratios of practically all elements to Cs were found in melts in mid-oceanic ridges. The melts of oceanic islands and backarc basins are characterized by relatively low ratios, without any significant anomalies. The lowest ratios of elements to Cs were found in melts of continental and marginal environments. These melts are also characterized by clearly seen geochemical anomalies that are typical of rocks of the corresponding environments (negative Ta–Nb, positive Pb, and other anomalies).
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Funding
This study was carried out under government-financed research projects for Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences (0137-2019-0016) and for Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry, Russian Academy of Sciences. The study was also partly supported by the Russian Foundation for Basic Research, project no. 19-05-00476.
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Translated by E. Kurdyukov
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Naumov, V.B., Girnis, A.V., Dorofeeva, V.A. et al. Volatile, Trace, and Ore Elements in Magmatic Melts and Natural Fluids: Evidence from Mineral-Hosted Inclusions. II. Effect of Crystallization Differentiation on the Concentrations of Ore Elements. Geochem. Int. 60, 537–550 (2022). https://doi.org/10.1134/S0016702922060040
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DOI: https://doi.org/10.1134/S0016702922060040