| Reference Type | Journal (article/letter/editorial) |
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| Title | Evidence for magma heterogeneity in the White River Ash (Yukon Territory) |
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| Journal | Canadian Journal of Earth Sciences |
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| Authors | Downes, Hilary | Author |
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| Year | 1985 (June 1) | Volume | 22 |
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| Issue | 6 |
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| Publisher | Canadian Science Publishing |
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| DOI | doi:10.1139/e85-096Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 478712 | Long-form Identifier | mindat:1:5:478712:3 |
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| GUID | 0 |
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| Full Reference | Downes, Hilary (1985) Evidence for magma heterogeneity in the White River Ash (Yukon Territory) Canadian Journal of Earth Sciences, 22 (6) 929-934 doi:10.1139/e85-096 |
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| Plain Text | Downes, Hilary (1985) Evidence for magma heterogeneity in the White River Ash (Yukon Territory) Canadian Journal of Earth Sciences, 22 (6) 929-934 doi:10.1139/e85-096 |
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| In | (1985, June) Canadian Journal of Earth Sciences Vol. 22 (6) Canadian Science Publishing |
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| Abstract/Notes | Two Recent Plinian eruptions in the Wrangell Mountains (southeast Alaska) gave rise to two distinct ash-fall deposits that are collectively known as the White River Ash and cover much of the Yukon Territory, northwest Canada. Analysis of the pumiceous glass indicates that the magma chamber was compositionally inhomogeneous prior to each eruption. No compositional stratigraphy has been detected in the deposits, indicating either thorough mixing in the eruption cloud or thorough reworking after deposition. Thus each individual sample of ash represents a large part of the magma chamber, whereas larger pumice fragments are more homogeneous. Variations in temperature, 950–990 and 995–1030 °C, respectively, for the older and younger eruptions, and −log fo2 values, 9.3–8.3 and 8.3–7.7, derived from the Fe–Ti oxides, support the conclusion that the magma chamber was inhomogeneous. |
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