Reevaluation of the Occurrence of Interstratified Clays and Other Phyllosilicates in Southern Alberta Soils

Dudas, M. J.; Pawluk, S.

doi:10.4141/cjss82-007

Cited by 18 publications

(9 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The presence of vermiculite in the samples was not supported by previous observations (Warren and Dudas, 1992), and vermiculite has not been iden- tiffed in samples from other studies of similar soils (e.g., Dudas and Pawluk, 1982). X-ray diffraction data and the ability of the clays to fix only 4 g.kg t (0.4%)K § (Warren and Dudas, 1992) indicated the absence of significant quantities of vermiculite in the samples.…”

Section: Layer Chargecontrasting

confidence: 46%

“…The clay-sized fraction (< 2 um diameter) of the samples was dominated by smectite and clay-sized dioctahedral mica with lesser quantities of kaolinite, chlorite, and quartz (Warren, 1991) typical of soils from the Interior Plains region of western Canada (Kodama, 1979;Dudas and Pawluk, 1982). The samples of the acidified material displayed pH values of about 2.0 in 0.01 mol.…”

Section: Resultsmentioning

confidence: 99%

“…The clay-size fraction is commonly dominated by admixtures of discrete smectite and clay-sized mica, with lesser amounts of kaolinite, chlorite, and quartz (Rice et al, 1959;Pawluk, 1961;Kodarna, 1979;Dudas and Pawluk, 1982;Spiers et al, 1989). The clays are allogenic, derived mainly from underlying Cretaceous sedimentary rocks.…”

Section: Introductionmentioning

confidence: 99%

“…Montmorillonite is the common smectite in western Canadian soils with beidellite frequently identified as a minor phase (Dudas and Pawluk, 1982). One possible explanation for the presence of beidellite in these soils is alteration and weathering of montmorillonite under acidic conditions (Karathanasis and Hajek, 1983).…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Effects of Acidification on the Chemical Composition and Layer Charge of Smectite from Calcareous Till

Warren

Dudas

Abboud³

1992

Clays and clay miner.

View full text Add to dashboard Cite

Abstract--The objectives of the study were to determine the chemical composition and layer charge of smectite found in calcareous till of the Interior Plains region of western Canada and to examine the effects of acidification on alteration of the smectite. Samples of acidified and non-acidified (calcareous) lateWisconsin till were obtained from four soil pits located immediately adjacent to an elemental sulfur block located in southern Alberta. Samples of the surface material (0-10 cm depth) had been subjected to extreme acidity for 25 years due to the oxidation of elemental sulfur and displayed pH values of about 2.0. Samples of the till obtained at depth (65-75 cm) remained calcareous with pH values between 7.3 and 7.6. A combination of analytical methods was used to determine the chemical composition of the smectite found in the samples. The layer charge of the smectite was determined independently using X-ray diffraction data for n-alkylammonium saturated specimens. Smectite found in the non-acidified calcareous material was characteristic of montmorillonite with a low content of Fe and very little substitution of A1 for Si in the tetrahedral sheet. The smectite had a structural formula of M+o 40(Si3.96A10 04)(ml= 56Fe3+o.~oMgo.33)O~o(OH)2 , which compared well with a mean value for layer charge of 0.399 mol(-)/O~o(OH)2 determined using X-ray diffraction data for n-alkylammonium treated specimens. Smectite remaining in the till material subjected to extreme acidity underwent incongruent dissolution with a net loss of layer charge and preferential loss of octahedral Mg.

show abstract

Section: Layer Chargecontrasting

confidence: 46%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effects of Acidification on the Chemical Composition and Layer Charge of Smectite from Calcareous Till

Warren

Dudas

Abboud³

1992

Clays and clay miner.

View full text Add to dashboard Cite

show abstract

“…The clay mineralogy of soils across the CWD-endemic region of the prairie provinces is dominated by smectites (mostly Mte), with smaller amounts of mica, kaolinite and chlorite 29,[32][33][34][35][36] ( Fig. 3B).…”

Section: Prion Interactions With Different Soil Compoundsmentioning

confidence: 99%