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SAMPLE INFO : UT540
Sample ID:UT540
Station ID:UT540
Latitude:63.681
Longitude:-138.708
Datum:NAD83
Sample Type 1:Tephra Fall
Field Lithology:Rhyolite
Text Description:
From Westgate et al. (2000): 25-cm-thick-tephra; consists of thin, bubble-wall shards. Orthopyroxene, plagioclase, magnetite, and ilmenite are relatively abundant in the small crystal component, which also contains minor amounts of clinopyroxene, apatite, and zircon. Deformed, normally graded vitric beds; sharply defined basal contact with underlying loess. Lowermost 20 cm of tephra is very pure, the uppermost 5 cm consists of reworked tephra and loess. From Preece et al. (2000): Tephra exposed 2 m above road level. Grey fine sand and silt with organics occur below the tephra, which is covered by 1.4 m of bedded grey silt with peaty organics. From Preece et al. (2011): trace amounts of brown glass; in grey fine sand and silt associated with organics; field name 2683

References:
Dawson Tephra: a prominent stratigraphic marker of late Wisconsinan age in west-central Yukon, Canada
Characterization, identity, distribution, and source of late Cenozoic tephra beds in the Klondike District of the Yukon, Canada
Emmons Lake Volcanic Center, Alaska Peninsula: source of the late Wisconsin Dawson tephra, Yukon Territory, Canada
A catalogue of late Cenozoic tephra beds in the Klondike Goldfields and adjacent areas, Yukon Territory
Old Crow tephra across eastern Beringia: a single cataclysmic eruption at the close of Marine Isotope Stage 6
The application of ICP-MS methods to tephrochronological problems

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
UT54063.681-138.708Westgate, J. A.1983-01-01 25355 ± 136 known unit; 10281; Age is approximate. Weighted mean of two samples of graminoid leaves from in situ surface below tephra (original dates reported in Froese and others 2006; weighted mean reported in Preece and others 2011).-24050--Roadcut along lower end of Sulphur Creek, just above its junction with Dominion Creek, Yukon Territory, Canada. Westgate et al. (2000) reference section for Dawson Tephra. Coordinates from Preece et al. (2011). Datum not specified, assumed to be NAD83.From Westgate et al. (2000): 25-cm-thick-tephra; consists of thin, bubble-wall shards. Orthopyroxene, plagioclase, magnetite, and ilmenite are relatively abundant in the small crystal component, which also contains minor amounts of clinopyroxene, apatite, and zircon. Deformed, normally graded vitric beds; sharply defined basal contact with underlying loess. Lowermost 20 cm of tephra is very pure, the uppermost 5 cm consists of reworked tephra and loess. From Preece et al. (2000): Tephra exposed 2 m above road level. Grey fine sand and silt with organics occur below the tephra, which is covered by 1.4 m of bedded grey silt with peaty organics. From Preece et al. (2011): trace amounts of brown glass; in grey fine sand and silt associated with organics; field name 2683UT540Tephra FallCumulateGlass 0.26 10301ICPMS 5.27 83.31 896.84 75.7 5.85 25.25 6.82 0.95 6.85 1.23 7.89 1.71 4.96 0.76 4.93 0.8 43.72 189.8 7.77 6.43 0.61 18.55 8.66 4.18 9.2 3403ICP
UT54063.681-138.708Westgate, J. A.1983-01-01 25355 ± 136 known unit; 10281; Age is approximate. Weighted mean of two samples of graminoid leaves from in situ surface below tephra (original dates reported in Froese and others 2006; weighted mean reported in Preece and others 2011).-24050--Roadcut along lower end of Sulphur Creek, just above its junction with Dominion Creek, Yukon Territory, Canada. Westgate et al. (2000) reference section for Dawson Tephra. Coordinates from Preece et al. (2011). Datum not specified, assumed to be NAD83.From Westgate et al. (2000): 25-cm-thick-tephra; consists of thin, bubble-wall shards. Orthopyroxene, plagioclase, magnetite, and ilmenite are relatively abundant in the small crystal component, which also contains minor amounts of clinopyroxene, apatite, and zircon. Deformed, normally graded vitric beds; sharply defined basal contact with underlying loess. Lowermost 20 cm of tephra is very pure, the uppermost 5 cm consists of reworked tephra and loess. From Preece et al. (2000): Tephra exposed 2 m above road level. Grey fine sand and silt with organics occur below the tephra, which is covered by 1.4 m of bedded grey silt with peaty organics. From Preece et al. (2011): trace amounts of brown glass; in grey fine sand and silt associated with organics; field name 2683UT540Tephra FallCumulateGlass 74.85 0.29 13.68 1.97 0.08 0.22 1.21 4.06 3.6 0.03 3403EMP1.97 5.27 94.2 889 83.1 23 52.4 6.33 29 6.87 0.95 6.5 1.22 7.43 1.86 5.17 0.85 5.26 0.83 50.4 323 8.28 8.88 0.58 20.5 8.65 3.72 6.41 8.83 2.77 1.33 1.9 38.3 10301ICPMS

SAMPLE LOCATION

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