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SAMPLE INFO : Midnight_Dome_tephra_average
Sample ID:Midnight_Dome_tephra_average
Station ID:Midnight_Dome_Terrace
Latitude:64.05
Longitude:-139.41
Datum:NAD83
Sample Type 1:Tephra Fall
 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.

References:
Field trip guide for the International Field Conference and Workshop on Tephrochronology and Volcanism
Dating Early and Middle (Reid) Pleistocene glaciations in central Yukon by tephrochronology

GEOCHEM DATA
StationIDLatitudeLongitudeGeologistDateVisitedAge InfoVolcanoEruptionLocation DescriptionText DescriptionSample IDSample Type 1Sample Type 2Final UnitMaterialCoeffSiO2TiO2Al2O3FeOTMnOMgOCaONa2OK2OP2O5Total-majorsREF majorsMETH majorsFe2O3/Fe203T origFeO/FeOT origVolatiles csvMETH volatilesCsRbBaSrLaCePrNdSmEuGdTbDyHoErTmYbLuYZrNbHfTaPbThUScVCrFeCoNiCuZnGaMoAsNaKRef trace1METH trace1RbBaSrLaCeNdSmEuGdDyErYbLuYZrNbPbThUScTiVCrNiCuZnGaRef trace2METH trace2Light csvHalogen csvother major csvother lile csvother ree csvother hfse csvother hpe csvother tm csvother misc csv
Midnight_Dome_Terrace64.05-139.41Froese, D. G. The Midnight Dome site is located on an intermediate terrace, approximately 100 m above the modern valley-floor, 2 km east of Dawson City along the Midnight Dome road, Yukon Territory, Canada. The site consists of fluvial and glaciofluvial gravel overlying bedrock, covered by 10 -14 m of loess, retransported loess and colluvial deposits. Datum not specified, assumed to be NAD83.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.Midnight_Dome_tephra_averageTephra FallCumulateGlassWestgate 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. 70.83Westgate 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. 0.69Westgate 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. 14.63Westgate 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. 3.52Westgate 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. 0.14Westgate 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. 0.76Westgate 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. 2.68Westgate 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. 5.15Westgate 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. 1.44 10311EMP3.52Cl=0.16; H2O=2.6EMP 25.4 466 147 12.7 26.2 4.2 18.5 4.99 1.38 5.09 0.94 5.82 1.2 3.62 0.6 32.46 117.6 3.02 2.63 1.28 10121ICPMS

SAMPLE LOCATION

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