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Manganiferous smectite from tirebolu (NE-Turkey)

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Abstract

A pink-colored (HUE 5R-7/4), predominantly calcium saturated, clay mineral from Tirebolu, NE-Turkey, is shown to be a dioctahedral, high-charge manganiferous smectite. It is probably an alteration product of volcanic tuffs of rhyodactitic composition. Ionic formula: (Si7.71Al0.29)IV(Al3.04Fe 3+0.12 Fe 2+0.02 Mg0.92Mn 2+0.07 )VI O20 (OH)4 0.79 M+ Cation exchange capacity: 92 me/100 g (air dry sample). Unit cell parameters (ca. 20 ° C; ca. 40% RH): a0∼9.02 Å b0∼5.21 Å Mg++... Mn-smectite: c0∼14.65 Å Ca++... Mn-smectite: c0∼14.83 Å K+... Mn-smectite: c0∼12.10 Å

Zusammenfassung

Ein rosa (HUE 5R-7/4), weitgehend Calcium-gesättigtes Tonmineral von Tirebolu (NO-Türkei) wurde als ein dioktaedrischer, hochgeladener manganhaltiger Smektit identifiziert. Er ist wahrscheinlich ein Umwandlungsprodukt eines rhyodazitischen Tuffs. Strukturformel: (Si7.71Al0.29)IV(Al3.04Fe 3+0.12 Fe 2+0.02 Mg0.92Mn 2+0.07 )VI O20 (OH)4 0.79 M+ Kationaustauschkapazität: 92 me/100 g (luftgetrocknet). Gitterkonstanten (ca. 20° C; ca. 40% RF): a0∼9.02 Å b0∼5.21 Å Mg++... Mn-Smektit: c0∼14.65 Å Ca++... Mn-Smektit: c0∼14.83 Å K+... Mn-Smektit: c0∼12.10 Å

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Authors and Affiliations

  1. Laboratorium für Sedimentforschung, Universität Heidelberg, Germany

    Gerrit van der Kaaden & Joost Quakernaat

  2. Norwegian Forest Research Institute, Vollebekk, Norway

    Odd Gjems

Authors
  1. Gerrit van der Kaaden
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  2. Joost Quakernaat
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  3. Odd Gjems
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van der Kaaden, G., Quakernaat, J. & Gjems, O. Manganiferous smectite from tirebolu (NE-Turkey). Contr. Mineral. and Petrol. 19, 302–308 (1968). https://doi.org/10.1007/BF00389412

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  • DOI: https://doi.org/10.1007/BF00389412

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