| Reference Type | Journal (article/letter/editorial) |
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| Title | Distribution, composition, and source of the White River Ash, Yukon Territory |
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| Journal | Canadian Journal of Earth Sciences |
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| Authors | Lerbekmo, J. F. | Author |
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| Campbell, F. A. | Author |
| Year | 1969 (February 1) | Volume | 6 |
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| Issue | 1 |
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| Publisher | Canadian Science Publishing |
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| DOI | doi:10.1139/e69-011Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 472197 | Long-form Identifier | mindat:1:5:472197:4 |
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| GUID | 0 |
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| Full Reference | Lerbekmo, J. F., Campbell, F. A. (1969) Distribution, composition, and source of the White River Ash, Yukon Territory. Canadian Journal of Earth Sciences, 6 (1) 109-116 doi:10.1139/e69-011 |
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| Plain Text | Lerbekmo, J. F., Campbell, F. A. (1969) Distribution, composition, and source of the White River Ash, Yukon Territory. Canadian Journal of Earth Sciences, 6 (1) 109-116 doi:10.1139/e69-011 |
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| In | (1969, February) Canadian Journal of Earth Sciences Vol. 6 (1) Canadian Science Publishing |
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| Abstract/Notes | The White River Ash is a bi-lobate 1500 year old deposit occupying at least 6 cubic miles and covering some 125β000 square miles of southern Yukon and eastern Alaska. Sixty-six samples were collected at 5-mile intervals, principally along two traverses 120 miles apart across the main lobe, and subjected to X-ray fluorescence and petrographic analysis.The ash is a rhyodacite composed of glass (nβ=β1.502), andesine, hornblende, hypersthene, and magnetite. The average chemical composition is SiO2β=β67.4, Al2O3β=β15.1, TiO2β=β0.5, MgOβ=β2.0, FeOβ=β2.0, Fe2O3β=β2.2, Na2Oβ=β4.1, K2Oβ=β2.5 and CaOβ=β4.1, but there is a significant difference between the two traverses owing to the increase in glass relative to crystal components downwind.A synthesis of the distribution of the ash permitted the drawing of a 5 by 12 miles 'target' source rectangle in the St. Elias Range between Mts. Natazhat and Bona in Alaska. Aerial photographs revealed a suspect mound 0.4 miles in diameter beside the Klutlan Glacier. Access by helicopter showed the mound to be a flat cone of large White River pumice fragments. It is believed that the vent lies beneath the glacier next to the cone. |
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