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Geochemistry of Fe3+ in the hydrothermal dickite from Jedlina Zdroj (Lower Silesia, Poland)

Premović Pavle I. (Laboratorija za geohemiju, kosmohemiju i astrohemiju, Prirodno-matematički fakultet, Niš)
Ciesielczuk Justyna (Department of General Geology, Faculty of Earth Sciences, University of Silesia, Sosnowiec, Poland)
Todorović Bratislav Ž. (Laboratorija za opštu hemiju, Tehnološki fakultet, Leskovac)
Đorđević Dragan M. (Laboratorija za geohemiju, kosmohemiju i astrohemiju, Prirodno-matematički fakultet, Niš)
Krstić Nenad S. (Laboratorija za geohemiju, kosmohemiju i astrohemiju, Prirodno-matematički fakultet, Niš)

Geochemical analysis for Fe was made on a representative sample of dickite-rich hydrothermal clay from Jedlina Zdroj. The mineralogy of the sample is comparatively simple, dickite being the principal component (>95 wt. % of the total sample), with lesser amounts of goethite and barite. Geochemical fractionation and inductively coupled plasma-optical emission spectrometry indicated that most of the Fe (ca. 97 wt. % of the total metal) resides in the dickite. Electron spin resonance showed that some of the Fe in the dickite structure is in the form of Fe3+. A substantial proportion of these ions (as well as Fe) in the dickite matrix were probably contained in the original hydrothermal dickite-forming solution. From the geochemistry of Fe3+, it was deduced that the oxidation potential (Eh) and pH of the solution during the formation of dickite from the Jedlina Zdroj were approximately 0.45-0.95 V (highly oxygenated) and 0-4 (highly acidic), respectively.

Keywords: kaolinite, dickite, iron