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Redox State of Tektites from Different Scattering Fields: Evidence from the Data of Electrochemical Study of Intrinsic Oxygen Fugacity

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Abstract

The results of study of the intrinsic oxygen fugacity (fO2) of various types of tektites from the European and Australasian scattering fields (moldavites, indochinites, philippinites, and australites) performed by the electrochemical method using an apparatus with two solid electrolytes are reported. The fO2 values of tektite glasses in the temperature range of 800–1050°C studied are between the fO2 of the iron–wustite and wustite–magnetite buffer equilibria. They demonstrate a significantly more reduced character of tektites in comparison with magmatic melts (volcanic glasses) of the crustal and mantle origin. Among the Australasian tektites, the widest fO2 variations are typical of indochinites including more diverse tektite species (Muong-Nong type and splat-forms), which are much closer to the hypothetical parental impact crater than philippinites and australites. At temperatures above that of complete melting (≥1000°C), fO2 for all tektite glasses is significantly higher than the fO2 values that correspond to the equilibrium of the metallic phase of iron with the silicate melt. It is assumed that the presence of microinclusions of metallic iron together with wustite, as well as magnetite and hematite in some tektites, is associated with nonequilibrium processes at different stages of tektite formation.

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Funding

This study was carried out as part of a State Assignment of the Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences (project no. 0137-2019-0017) and was supported in part by the Russian Foundation for Basic Research (project no. 17-05-00713).

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Authors and Affiliations

  1. Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, 119991, Moscow, Russia

    O. A. Lukanin, E. V. Zharkova & V. G. Senin

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  1. O. A. Lukanin
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  2. E. V. Zharkova
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  3. V. G. Senin
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Correspondence to O. A. Lukanin.

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Translated by A. Bobrov

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Lukanin, O.A., Zharkova, E.V. & Senin, V.G. Redox State of Tektites from Different Scattering Fields: Evidence from the Data of Electrochemical Study of Intrinsic Oxygen Fugacity. Dokl. Earth Sc. 497, 295–299 (2021). https://doi.org/10.1134/S1028334X21040103

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  • DOI: https://doi.org/10.1134/S1028334X21040103

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