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• W2886610040 abstract "The purpose of the study was to investigate glauconite weathering in regolith profile developed on Santonian marls in Zabierzów (South Poland) most likely during Paleogene. Because of the high carbonates content the studied regolith appears to constitute a unique case where glauconite underwent weathering under alkaline conditions. Unweathered glauconite–bearing marls and regolith profile were sampled. Samples pH was determined for 1:1 rock–water solution. Mineral composition of bulk rock, clay fraction (<2 and <0.2 μm) and green pellets separated from bulk rock was determined with X-ray powder diffraction (XRD). Thin sections prepared from the undisturbed bulk rock were examined using optical microscopy. Separated clay fraction and green pellets were analyzed using Fourier transform infrared spectroscopy (FTIR). Mössbauer spectroscopy was used to determine Fe2+/Fe3+ in unweathered glauconite. Scanning electron microscope with energy dispersive X-ray spectroscopy was used for observation of morphology and chemical analysis of the separated pellets. Samples were characterized by alkaline reaction (pH between 7.66 and 7.98). XRD analysis of unweathered marls showed presence of calcite, glauconite, quartz, smectite and traces of kaolinite, apatite and pyrite. The weathered material was depleted in glauconite and pyrite while enriched in goethite. Mössbauer spectroscopy showed that oxidation of part of octahedral Fe2+ located within the glauconite took place. FTIR spectroscopy showed that in regolith profile intensities of OH–stretching band assigned to glauconite decreased upward while goethite bands intensities increased, relatively to unweathered marls. In the studied profile glauconite underwent dissolution. Si and Mg were leached out with weathering solution while due to alkaline pH Fe3+ crystallized in situ in form of goethite having likely substitutions of Al. Neoformation of smectite–rich mixed layered mica–smectite minerals from the solution was also likely to take place." @default.
• W2886610040 created "2018-08-22" @default.
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• W2886610040 date "2018-12-01" @default.
• W2886610040 modified "2023-09-25" @default.
• W2886610040 title "Weathering of glauconite in an alkaline environment — A case study from Krakow area, Poland" @default.
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• W2886610040 doi "https://doi.org/10.1016/j.catena.2018.08.003" @default.
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