| Reference Type | Journal (article/letter/editorial) |
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| Title | A numerical approach toward the classification of magnetites from tephra in southern Alberta |
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| Journal | Canadian Journal of Earth Sciences |
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| Authors | King, R. H. | Author |
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| Kingston, M. S. | Author |
| Barnett, R. L. | Author |
| Year | 1982 (October 1) | Volume | 19 |
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| Issue | 10 |
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| Publisher | Canadian Science Publishing |
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| DOI | doi:10.1139/e82-178Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 477286 | Long-form Identifier | mindat:1:5:477286:0 |
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| GUID | 0 |
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| Full Reference | King, R. H., Kingston, M. S., Barnett, R. L. (1982) A numerical approach toward the classification of magnetites from tephra in southern Alberta. Canadian Journal of Earth Sciences, 19 (10) 2012-2019 doi:10.1139/e82-178 |
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| Plain Text | King, R. H., Kingston, M. S., Barnett, R. L. (1982) A numerical approach toward the classification of magnetites from tephra in southern Alberta. Canadian Journal of Earth Sciences, 19 (10) 2012-2019 doi:10.1139/e82-178 |
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| In | (1982, October) Canadian Journal of Earth Sciences Vol. 19 (10) Canadian Science Publishing |
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| Abstract/Notes | High-titanium glass-encased magnetites associated with intermixed tephras in upper subalpine soils in Banff National Park are shown to be characteristic of Mazama tephra and of regional significance. Similar magnetites occur in a Mazama layer above a paleosol at Fish Creek, Alberta and within a sample of Mazama ash (UA 396) from Windy Point, Alberta. Detailed sampling and analysis of the Fish Creek tephra indicate that the magnetites do not represent a separate eruptive event or an older ashfall. Cluster analysis of glass-encased magnetites from reference samples of Mazama, St. Helens Y, and Bridge River ashes revealed composite grouping of Mazama and Bridge River magnetites and separate and strong groupings of high-TiO2 magnetites. Discriminant analysis identifies MgO, TiO2, and Al2O3 as the most significant chemical discriminants between the various ashes. Discriminant function analysis identifies the high-titanium magnetites as Mazama in type and successfully classifies 96% of the tephra-derived magnetites in two soils developed from intermixed ashes. Numerical analysis confirms the utility of compositional variations in tephra-derived magnetites in providing a time-stratigraphic framework in the analysis of volcanic ash soils in western Canada. |
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