http://hdl.handle.net/20.500.12128/10590
Title: | Geochemistry and electron spin resonance of hydrothermal dickite (Nowa Ruda, Lower Silesia, Poland) : Vanadium and chromium |
Authors: | Premovic, P. Ciesielczuk, Justyna Bzowska, Grażyna Dordevic, M. |
Keywords: | electron spin resonance; kaolinite; dickite; chromium; vanadium |
Issue Date: | 2012 |
Citation: | "Geologica Carpathica" Vol. 63 (3) (2012), s. 241-252 |
Abstract: | Geochemical analyses for trace V and Cr have been done on a representative sample of a typical hydrothermal dickite/kaolinite filling vein at Nowa Ruda. The mineralogy of the sample is comparatively simple, dickite being the principal component (ca. 91 % of the total sample). Geochemical fractionation and inductively coupled plasma-optical emission spectrometry (ICP-OES) indicate that most ( > 90 % of total metal) of the V and Cr reside in the dickite. Electron Spin Resonance (ESR) shows that most ( > 70 %) of the V in the dickite structure is in the form of vanadyl (VO2+) ions. A high concentration of Cr3+ is also detected in this structure by ESR. The combination of geochemical and spectroscopic tools applied to VO2+ and Cr3+ allow one to specify the Eh ( > 0.4 V, highly oxidizing) and pH ( 4.0, highly acidic) of the solution during the formation of dickite from the Nowa Ruda Basin. Substantial proportions of the V and Cr (as well as VO2+ and Cr3+) in the dickite structure were probably contained in an original hydrothermal acid water. We suggest that hot hydrothermal waters leached the surrounding varieties of gabbroids enriched in V and Cr for the dickite-forming solution. The results of this work have shown V and Cr are potentially reliable indicators for geochemical characterization of the physicochemical conditions of their formation. The bulk-rock V/Cr ratio in hydrothermal dickites and kaolinites from Nowa Ruda, Sonoma (California, USA), Cigar Lake (Saskatchewan, Canada) and Teslić (Bosnia and Hercegovina) is also briefly explored here as a potential tracer of redox state during their formation. |
URI: | http://hdl.handle.net/20.500.12128/10590 |
DOI: | 10.2478/v10096-012-0020-8 |
ISSN: | 1336-8052 |
Appears in Collections: | Artykuły (WNP) |
File | Description | Size | Format | |
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Premovic_Ciesielczuk_geochemistry_and_electron_spin.pdf | 3,96 MB | Adobe PDF | View/Open |
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