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X-Ray radial distribution function analysis of acid volcanic glasses from the Eastern Rhodopes, Bulgaria

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Abstract

Five natural acid volcanic glasses (perlites) from the Eastern Rhodope mountains, Bulgaria, have been studied by X-ray diffraction. The quantity of the microlites varies from 1–3.5 weight percent. It is higher in the glasses from the rhyolite-perlite transition zone. Total pair correlation functions have been calculated for three of the glasses with less than 2 weight percent microlites. All total pair correlation functions are quite similar and have six well defined peaks up to 8 Å. Beyond 8 Å they are practically featureless. The general form of the curves and peak positions suggests that the short-range order in all the three glasses is compatible with a 6-membered tetrahedral ring polymerization scheme with some contribution of fourmembered rings. The T-01 (T=Si, Al) distance shows linear correlation with the weight percent ratio Al2O3/SiO2. The averaged first nearest neighbour distances T-01, O-01 and T-T1 are 1.615±0.005 Å, 2.66±0.02 Å and 3.16±0.02 Å, respectively. The mean T-O-T bond angle is 157±4°. Energy minimization and topology considerations of the possible distribution of different tetrahedral rings are discussed.

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Authors and Affiliations

  1. Institute of Applied Mineralogy, Bulgarian Academy of Sciences, Rakovski Street 92, 1000, Sofia, Bulgaria

    N. Zotov

  2. Higher Institute of Chemical Technology, 1756, Sofia, Bulgaria

    V. Dimitrov

  3. Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Street 1, Block 24, 1113, Sofia, Bulgaria

    Y. Yanev

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  1. N. Zotov
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  2. V. Dimitrov
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  3. Y. Yanev
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Zotov, N., Dimitrov, V. & Yanev, Y. X-Ray radial distribution function analysis of acid volcanic glasses from the Eastern Rhodopes, Bulgaria. Phys Chem Minerals 16, 774–782 (1989). https://doi.org/10.1007/BF00209701

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  • DOI: https://doi.org/10.1007/BF00209701

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