Clay mineralogy and stratigraphy of offshore Lake Agassiz sediments in southern Manitoba

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dc.contributor.authorLast, William.en_US
dc.date.accessioned2009-12-02T14:47:07Z
dc.date.available2009-12-02T14:47:07Z
dc.date.issued1974en_US
dc.degree.disciplineEarth Sciencesen_US
dc.degree.levelMaster of Science (M.Sc.)en_US
dc.description.abstractAn experimental methodology study of five common mounting techniques and procedures and three calculation methods helped determine the specific X-ray techniques to be used in the semi-quantitative estimation of clay minerals in the study of offshore Lake Agassiz sediments. The aqueous pipette-on-g1ass slide technique with calculation by the direct comparison method was chosen because it offered best and most consisitent results, ease and rapidity of obtaining results and best correlation possibilities. Numerous attempts have been made at subdividing the offshore deposits of Lake Agassiz in southern Manitoba and adjacent parts of the United States. The results of detailed clay mineralogical and textural analyses of samples from the Red River basin suggest a three-fold stratigraphic subdivision. This subdivision is also supported by non-clay mineralogy differences within the sediment and by the limited soil engineering data available. Unit 1, the lowermost offshore unit recognized, is defined primarily on the basis of its low montmorillonite:illite ratio, very fine average grain size and low Atterberg limits. Unit 2 is recognized by its high montmorillonite:illite ratio, very fine average grain size, and high Atterberg limits. Unit 3, the uppermost offshore unit recognized, is defined by its low montmorillonite:illite ratio relatively coarse grain size and low Atterberg limits. These three units can be idenified throughout the sedimentary basin in Manitoba and roughly correlate with units in North Dakota. Although various hypotheses can be suggested to explain the observed stratigraphic and lateral changes within the offshore sediments, probably the most reasonable explanation is that of differential settling of the clay particles caused by salinity changes in the lake and size difference of the various minerals.en_US
dc.format.extentxiv, 183 leaves.en_US
dc.format.extent7912699 bytes
dc.format.mimetypeapplication/pdf
dc.identifierocm72785685en_US
dc.identifier.urihttp://hdl.handle.net/1993/3521
dc.language.isoengen_US
dc.rightsopen accessen_US
dc.rightsThe reproduction of this thesis has been made available by authority of the copyright owner solely for the purpose of private study and research, and may only be reproduced and copied as permitted by copyright laws or with express written authorization from the copyright owner.en_US
dc.titleClay mineralogy and stratigraphy of offshore Lake Agassiz sediments in southern Manitobaen_US
dc.typemaster thesisen_US
local.subject.manitobayesen_US
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