Weathering of glauconite in an alkaline environment : a case study from Krakow area, Poland

2018
journal article
article
5
dc.abstract.enThe 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 \mu m) 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 Fe^{2+}/Fe^{3+} 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 Fe^{2+} 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 Fe^{3+} 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.pl
dc.affiliationWydział Geografii i Geologii : Instytut Nauk Geologicznychpl
dc.contributor.authorKisiel, Marta - 189551 pl
dc.contributor.authorSkiba, Michał - 131897 pl
dc.contributor.authorMakiel, Magdalena - 152298 pl
dc.contributor.authorMaj-Szeliga, Katarzyna - 119158 pl
dc.contributor.authorBłachowski, Arturpl
dc.date.accessioned2018-09-06T06:57:31Z
dc.date.available2018-09-06T06:57:31Z
dc.date.issued2018pl
dc.description.additionalBibliogr. s. 550-551. Magdalena Makiel podpisana: Magdalena Skonecznapl
dc.description.physical541-551pl
dc.description.volume171pl
dc.identifier.doi10.1016/j.catena.2018.08.003pl
dc.identifier.eissn1872-6887pl
dc.identifier.issn0341-8162pl
dc.identifier.projectROD UJ / Opl
dc.identifier.urihttps://ruj.uj.edu.pl/xmlui/handle/item/56653
dc.languageengpl
dc.language.containerengpl
dc.rightsDodaję tylko opis bibliograficzny*
dc.rights.licencebez licencji
dc.rights.uri*
dc.subject.englauconitepl
dc.subject.engoethitepl
dc.subject.ensmectitepl
dc.subject.enalkaline pHpl
dc.subject.endissolutionpl
dc.subject.enKrakow areapl
dc.subtypeArticlepl
dc.titleWeathering of glauconite in an alkaline environment : a case study from Krakow area, Polandpl
dc.title.journalCatenapl
dc.typeJournalArticlepl
dspace.entity.typePublication
dc.abstract.enpl
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 \mu m) 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 Fe^{2+}/Fe^{3+} 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 Fe^{2+} 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 Fe^{3+} 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.
dc.affiliationpl
Wydział Geografii i Geologii : Instytut Nauk Geologicznych
dc.contributor.authorpl
Kisiel, Marta - 189551
dc.contributor.authorpl
Skiba, Michał - 131897
dc.contributor.authorpl
Makiel, Magdalena - 152298
dc.contributor.authorpl
Maj-Szeliga, Katarzyna - 119158
dc.contributor.authorpl
Błachowski, Artur
dc.date.accessioned
2018-09-06T06:57:31Z
dc.date.available
2018-09-06T06:57:31Z
dc.date.issuedpl
2018
dc.description.additionalpl
Bibliogr. s. 550-551. Magdalena Makiel podpisana: Magdalena Skoneczna
dc.description.physicalpl
541-551
dc.description.volumepl
171
dc.identifier.doipl
10.1016/j.catena.2018.08.003
dc.identifier.eissnpl
1872-6887
dc.identifier.issnpl
0341-8162
dc.identifier.projectpl
ROD UJ / O
dc.identifier.uri
https://ruj.uj.edu.pl/xmlui/handle/item/56653
dc.languagepl
eng
dc.language.containerpl
eng
dc.rights*
Dodaję tylko opis bibliograficzny
dc.rights.licence
bez licencji
dc.rights.uri*
dc.subject.enpl
glauconite
dc.subject.enpl
goethite
dc.subject.enpl
smectite
dc.subject.enpl
alkaline pH
dc.subject.enpl
dissolution
dc.subject.enpl
Krakow area
dc.subtypepl
Article
dc.titlepl
Weathering of glauconite in an alkaline environment : a case study from Krakow area, Poland
dc.title.journalpl
Catena
dc.typepl
JournalArticle
dspace.entity.type
Publication
Affiliations

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