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Metasomatic column with the apobasite listvenites end-member from the Slovinky-Gelnica ore field (Gemeric Superunit, Western Carpathians) and comparison to their type localities from Ural

Simurkova M.

Geology, Geophysics and Environment

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2015

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Vol. 41, no. 1

132--133

EN

A metasomatic column (or metasomatic zone pattern) is the complete sequence of metasomatic zones characterising an individual metasomatic facies (Zharikov et al. 2007). The genesis of this column is the result of a series of processes, in the case of basic rock protolith leading to the formation of apobasite listvenites (in the sense of Sazonov 1975). It includes three partial processes: 1) carbonatization, 2) silicification and 3) formation of mica (e.g. Plissart et al. 2009) involving the infiltration of a CO2-rich fluids and shows similarity to processes of listvenitisation (e.g. Clayton 1993). Field research in Slovinky-Gelnica ore field has revealed the presence of such a metasomatic column (cf. Ivan 1987). It comprises metabasites as the protolith, carbonatised metabasites, listvenite-type metasomatites and listvenites s.s. The metabasites have features of subvolcanic rock types (Ivan 2009), what makes them comparable with similar rocks from Ural. The petrographic study of selected samples has showed that amphibole, chlorite and albite became progressively unstable in this sequence of alterations, replaced by carbonate, silica and lastly by the muscovite minerals, sericite or fuchsite (Ivan 1987). Carbonates change their quantity as well as mineralogical composition with the development of the column in two trends of changes: towards Mg-Fe carbonates or Mg-Ca carbonates. Regarding the samples from Ural, Fe-dolomites and ankerites predominate, the metasomatic columns derived from gabbros and dolerites are essentially the same. The geochemical study of rock samples from the study area (22 whole rock analyses) as well as the comparison with similarly metasomatised rock series from Ural (56 analyses) allowed as to give more detailed characterization of the metasomatic column. The most obvious change is a clear increase of K with decreasing Na as a sign of the albite break-up and Krich minerals (such as muscovite) formation. The increase of LOI and CO2 indicate the process of carbonatisation. Listvenitisation is often associated with the hydrothermal ore veins formation and the rare metal mineralization with concentration of elements such as Au, Co, Sb, Cu, Ni (e.g. Dinel et al. 2008, Buckman & Ashley 2010). This could be significant as regards the genesis of stratiform ore deposits within the Slovinky-Gelnica ore field.

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The effect of modifiers and precipitation conditions on physicochemical properties of MgCO3 and its calcinates

Pilarska A., Paukszta D., Szwarc K., Jesionowski T.

Physicochemical Problems of Mineral Processing

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2011

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Vol. 47

79-90

EN

The effects of modifiers and process conditions on synthesis of magnesium oxide by the carbonatization method and properties of the product are studied. Magnesium carbonate obtained from magnesium hydroxide and carbon dioxide was subjected to thermal decomposition at 800 C. The reaction of precipitation was performed checking the influence of temperature, rate and mode of reagents introduction, type and concentration of the modifier. The modifiers were the non-ionic compounds from the group of poly(ethylene glycols). The magnesium oxides produced were characterised by determination of their dispersivemorphological properties, wettability profiles, specific surface area, total volume and mean size of pores. The products were also subjected to identification by the X-ray diffraction method and TG/DTA analysis. The results revealed a significant impact of the concentration and type of modifiers on the physicochemical properties of MgO samples obtained and permitted selection of the best products for particular applications.

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The durability and repair problems of reinforced concrete columnar structures

Ślusarek J., Kostrzanowska A.

Architecture Civil Engineering Environment

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2010

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Vol. 3, no. 1

85-91

EN

In the paper an attempt is made to assess the durability of nine thirty-four years old reinforced concrete columnar structures. To assess the durability the durability model is used, suggesting determination of the structure wear based on the progress of carbonatization of concrete cover. On the basis of proper inspection the method of repair of analysed structures was proposed.

PL

W artykule podjęto próbę oszacowania trwałości dziewięciu trzydziestoczteroletnich, żelbetowych konstrukcji słupowych. Do oceny trwałości wykorzystano model trwałości, proponując ustalenie zużycia badanej konstrukcji na podstawie badania postępu karbonatyzacji otuliny betonowej. Na podstawie przeprowadzonych badań własnych została zaproponowana metoda naprawy analizowanych konstrukcji żelbetowych.

4

Chemical and mineralogical alteration in the Rutki-Ligota basalts : Tertiary Volcanic Formation, Lower Silesia

Adamczyk Z., Komraus J., Mączyński T.

Geological Quarterly

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2000

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Vol. 44, Nr 4

405-413

EN

The paper shows chemical alterations of the Rutki-Ligota basalt deposit of the Tertiary Volcanic Formation of Lower Silesia. The investigations indicate that the chemical alterations of basalts result from their textures and variations in mineral composition. The results of mineralogic studies of basalts suggest varied alteration processes: serpentinization, iddingsitization, uralitization and carbonatization. Some of products of these alterations (largely amphiboles and iron hydroxides) were identified using Mössbauer spectroscopy. The results of the studies indicate the usefulness of the Rutki-Ligota basalts not only in breakstone but also in mineral wool production.