Characterization of Lower and Middle Pleistocene tephra beds in the southern plains of western Canada

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dc.contributor.authorWestgate, John A.
dc.contributor.authorNaeser, Nancy D.
dc.contributor.authorBarendregt, René W.
dc.contributor.authorPearce, Nicholas J. G.
dc.date.accessioned2022-07-20T20:32:47Z
dc.date.available2022-07-20T20:32:47Z
dc.date.issued2022
dc.descriptionAccepted author manuscripten_US
dc.description.abstractWellsch Valley tephra, near Swift Current, southwestern Saskatchewan, and Galt Island tephra, near Medicine Hat, southeastern Alberta, have been referenced in the literature since the 1970s, but little is available on their physical and chemical attributes — necessary information if they are to be recognized elsewhere. This study seeks to remedy this situation. Both have a calc-alkaline rhyolitic composition with hornblende, biotite, plagioclase, pyroxene, and Fe–Ti oxides being dominant. They have a similar composition but are not the same. Wellsch Valley tephra has a glass fission-track age of 0.75 ± 0.05 Ma, a reversed magnetic polarity, and was deposited at the close of the Matuyama Chron. Galt Island tephra has an age of 0.49 ± 0.05 Ma, a normal magnetic polarity, and was deposited during the early Brunhes Chron. Rich fossil vertebrate faunas occur in sediments close to them. Major- and trace-element concentrations in their glass shards indicate a source in the Cascade Range of the Pacific Northwest, USA, but differences in trace-element ratios suggest they are not consanguineous.en_US
dc.description.peer-reviewYesen_US
dc.identifier.citationWestgate, J. A., Naeser, N. D., Barendregt, R. W., & Pearce, N. J. G. (2022). Characterization of Lower and Middle Pleistocene tephra beds in the southern plains of western Canada. Canadian Journal of Earth Sciences, 59(6), 360-370. https://doi.org/10.1139/cjes-2021-0073en_US
dc.identifier.urihttps://hdl.handle.net/10133/6265
dc.language.isoen_USen_US
dc.publisherCanadian Science Publishingen_US
dc.publisher.departmentDepartment of Geography and Environmenten_US
dc.publisher.facultyArts and Scienceen_US
dc.publisher.institutionUniversity of Torontoen_US
dc.publisher.institutionUniversity of Lethbridgeen_US
dc.publisher.institutionAberystwyth Universityen_US
dc.publisher.urlhttps://doi.org/10.1139/cjes-2021-0073en_US
dc.subjectTephraen_US
dc.subjectGlass shardsen_US
dc.subjectFission-track datingen_US
dc.subjectPaleomagnetismen_US
dc.subjectMajor and trace elementsen_US
dc.subjectWestern Canadaen_US
dc.subject.lcshVolcanic ash, tuff, etc.--Canada
dc.subject.lcshFission track dating
dc.subject.lcshPaleomagnetism--Canada, Western
dc.subject.lcshTrace elements
dc.subject.lcshCanada, Western
dc.titleCharacterization of Lower and Middle Pleistocene tephra beds in the southern plains of western Canadaen_US
dc.typeArticleen_US
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