Sample: Midnight_Dome_tephra_average
| Sample ID: |
Midnight_Dome_tephra_average [1] [2] |
| Station ID: |
Midnight_Dome_Terrace |
| AT Num: |
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| Volcano: |
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| Possible source: |
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| Eruption: |
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| Collector: |
Froese, D. G. |
| Date sampled: |
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| Sample type 1: |
Tephra Fall |
| Color: |
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| Final unit: |
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| Text Description: |
Westgate et al. (2001) state that this glass composition was obtained by averaging 3 samples (see footnote of table 2 in publication): UT1495, UT1552, UT1633. However, the supplemental data file D1, which lists individual points from samples used to calculate the average glass composition, does not include any individual points of analysis from sample UT1495. The Midnight Dome tephra is described as pods of reworked tephra occurring in the middle interglacial silt bed as well as in the immediately underlying loess at the Midnight Dome terrace site. Preece et al. (1999) type I beds are described as having a low crystal content, abundant bubble-wall glass shards, pumice with large vesicles, and very small amounts of brown glass; feldspar, orthopyroxene, and clinopyroxene are abundant with minor amounts of amphibole, magnetite, ilmenite, apatite, and zircon. |
| Sample Location: |
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References Cited
Froese, D.G, Westgate, J.A., and Alloway, B.V., (eds.), 2005, Field trip guide for the International Field Conference and Workshop on Tephrochronology and Volcanism: Institute of Geological and Nuclear Sciences Science Report 2005/26, Dawson City, Yukon Territory, Canada, July 31-August 8, 2005, 132 p.
Westgate, J.A., Preece, S.J., Froese, D.G., Walter, R.C., Sandhu, A.S., and Schweger, C.E., 2001, Dating Early and Middle (Reid) Pleistocene glaciations in central Yukon by tephrochronology: Quaternary Research, v. 56, n. 3, p. 335-348, doi: 10.1006/qres.2001. 2274 .