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SAMPLE INFO : UT81
Sample ID:UT81
Station ID:Fort_Selkirk
Latitude:62.8
Longitude:-137.39998
Datum:NAD83
Sample Type 1:Tephra Fall
Text Description:
Prominent, 20-cm-thick bed in the uppermost part of the stratified sediments. It has a silty loam texture with abundant chunky and platy glass shards as well as pumice fragments. Conspicuous minerals include feldspar, hypersthene, biotite, hornblende, magnetite and ilmenite; minor minerals include apatite and a pink zircon.

References:
Fission-track ages of late Cenozoic distal tephra beds in the Yukon Territory and Alaska
Old Crow tephra across eastern Beringia: a single cataclysmic eruption at the close of Marine Isotope Stage 6
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
Fort_Selkirk62.8-137.39998Westgate, J. A. 1480000 ± 110000 glass - FT; 10311; Age is approximate. Weighted mean age based on eight analyses corrected for partial track fading (two analyses from UT81 and six analyses from UT82); Westgate and others (2001).Fort Selkirk area, close to the confluence of the Yukon and Pelly Rivers, Yukon Territory, Canada. Sections on the right bank of the Yukon River, immediately downstream of Fort Selkirk, expose glacial deposits that are sandwiched between an upper and a lower sequence of basalt flows. Till is overlain by a fining-upward succession of stratified sediments consisting of poorly sorted gravel, sand, Fort Selkirk tephra, and silt. Location imprecisely georeferenced from Figure 1 in Westgate et al. (2001). Prominent, 20-cm-thick bed in the uppermost part of the stratified sediments. It has a silty loam texture with abundant chunky and platy glass shards as well as pumice fragments. Conspicuous minerals include feldspar, hypersthene, biotite, hornblende, magnetite and ilmenite; minor minerals include apatite and a pink zircon.UT81Tephra FallCumulateGlass 76.23 0.21 14.43 0.97 1.22 4.43 2.59 10311EMP0.97Cl=0.13; H2O=8.28EMP 1.25 930 16.4 29 10 1.87 0.52 0.21 0.97 0.17 2.52 0.47 5.7 1.6 2.17 1792INAA

SAMPLE LOCATION

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