Evolution of dioctahedral vermiculite in geological environments : an experimental approach

2013
journal article
article
13
cris.lastimport.wos2024-04-09T21:42:59Z
dc.abstract.enDioctahedral vermiculite commonly occurs in soils and fresh sediments, but has not been reported in sedimentary rocks. Little is known of the evolution of this mineral during diagenesis. According to the available literature, dioctahedral vermiculite is likely to exhibit strong potential for selective sorption and fixation of K+ involving interlayer dehydration and collapse. The objective of the present study was to investigate the influence of K+ saturation and seawater treatments on the structure of dioctahedral vermiculite. Due to the fact that no dioctahedral vermiculite standard reference material was available, a natural sample of soil clay containing dioctahedral vermiculite was used in the study. The clay was saturated with K+ using different protocols simulating natural processes taking place in soils and marine environments. The solid products of the experiments were analyzed for potassium content using flame photometry. The effect of the treatments used on the structure of dioctahedral vermiculite was studied using X-ray diffraction (XRD). The percentages of the collapsed interlayers were estimated by modeling the XRD patterns based on a whole-pattern multi-specimen modeling technique. All the treatments involving K+ saturation caused K+ fixation and irreversible collapse (i.e. contraction to 10 Å ) of at least a portion of the hydrated (vermiculitic) interlayers. Air drying of the K+-saturated samples greatly enhanced the degree of the collapse. The results obtained gave no clear answer as to whether time had had a significant effect on the degree to which irreversible collapse occurred. Selective sorption of K+ from artificial seawater was observed. These results clearly indicate that collapse of dioctahedral vermiculite is likely to occur in soils during weathering and in sediments during early diagenesis. Both processes need to be taken into consideration in sedimentary basin studies.pl
dc.affiliationWydział Biologii i Nauk o Ziemi : Instytut Nauk Geologicznychpl
dc.contributor.authorSkiba, Michał - 131897 pl
dc.date.accessioned2015-04-21T09:15:46Z
dc.date.available2015-04-21T09:15:46Z
dc.date.issued2013pl
dc.description.number4pl
dc.description.physical290-302pl
dc.description.volume61pl
dc.identifier.doi10.1346/CCMN.2013.0610409pl
dc.identifier.eissn1552-8367pl
dc.identifier.issn0009-8604pl
dc.identifier.urihttp://ruj.uj.edu.pl/xmlui/handle/item/5360
dc.languageengpl
dc.language.containerengpl
dc.rightsDodaję tylko opis bibliograficzny*
dc.rights.licencebez licencji
dc.rights.uri*
dc.subject.endioctahedral vermiculitepl
dc.subject.enearly diagenesispl
dc.subject.enK+ fixationpl
dc.subject.enK+ selective sorptionpl
dc.subject.ensoil illitizationpl
dc.subtypeArticlepl
dc.titleEvolution of dioctahedral vermiculite in geological environments : an experimental approachpl
dc.title.journalClays and Clay Mineralspl
dc.typeJournalArticlepl
dspace.entity.typePublication
cris.lastimport.wos
2024-04-09T21:42:59Z
dc.abstract.enpl
Dioctahedral vermiculite commonly occurs in soils and fresh sediments, but has not been reported in sedimentary rocks. Little is known of the evolution of this mineral during diagenesis. According to the available literature, dioctahedral vermiculite is likely to exhibit strong potential for selective sorption and fixation of K+ involving interlayer dehydration and collapse. The objective of the present study was to investigate the influence of K+ saturation and seawater treatments on the structure of dioctahedral vermiculite. Due to the fact that no dioctahedral vermiculite standard reference material was available, a natural sample of soil clay containing dioctahedral vermiculite was used in the study. The clay was saturated with K+ using different protocols simulating natural processes taking place in soils and marine environments. The solid products of the experiments were analyzed for potassium content using flame photometry. The effect of the treatments used on the structure of dioctahedral vermiculite was studied using X-ray diffraction (XRD). The percentages of the collapsed interlayers were estimated by modeling the XRD patterns based on a whole-pattern multi-specimen modeling technique. All the treatments involving K+ saturation caused K+ fixation and irreversible collapse (i.e. contraction to 10 Å ) of at least a portion of the hydrated (vermiculitic) interlayers. Air drying of the K+-saturated samples greatly enhanced the degree of the collapse. The results obtained gave no clear answer as to whether time had had a significant effect on the degree to which irreversible collapse occurred. Selective sorption of K+ from artificial seawater was observed. These results clearly indicate that collapse of dioctahedral vermiculite is likely to occur in soils during weathering and in sediments during early diagenesis. Both processes need to be taken into consideration in sedimentary basin studies.
dc.affiliationpl
Wydział Biologii i Nauk o Ziemi : Instytut Nauk Geologicznych
dc.contributor.authorpl
Skiba, Michał - 131897
dc.date.accessioned
2015-04-21T09:15:46Z
dc.date.available
2015-04-21T09:15:46Z
dc.date.issuedpl
2013
dc.description.numberpl
4
dc.description.physicalpl
290-302
dc.description.volumepl
61
dc.identifier.doipl
10.1346/CCMN.2013.0610409
dc.identifier.eissnpl
1552-8367
dc.identifier.issnpl
0009-8604
dc.identifier.uri
http://ruj.uj.edu.pl/xmlui/handle/item/5360
dc.languagepl
eng
dc.language.containerpl
eng
dc.rights*
Dodaję tylko opis bibliograficzny
dc.rights.licence
bez licencji
dc.rights.uri*
dc.subject.enpl
dioctahedral vermiculite
dc.subject.enpl
early diagenesis
dc.subject.enpl
K+ fixation
dc.subject.enpl
K+ selective sorption
dc.subject.enpl
soil illitization
dc.subtypepl
Article
dc.titlepl
Evolution of dioctahedral vermiculite in geological environments : an experimental approach
dc.title.journalpl
Clays and Clay Minerals
dc.typepl
JournalArticle
dspace.entity.type
Publication

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