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SAMPLE INFO : UT1057
Sample ID:UT1057
Station ID:UT1057
Latitude:63.817
Longitude:-139.044
Datum:NAD83
Sample Type 1:Tephra Fall
Field Lithology:Rhyolite
 Text Description:
13-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. From Preece et al. (2000): Discontinuous, white tephra bed interbedded with carbonaceous silt, gravel and sand. Tephra bed is 3.2 m from surface, immediately beneath the permafrost active layer; deformed. From Preece et al. (2011): 13 cm thick; bubble-wall shards, trace amounts of brown glass; interbedded with carbonaceous silt, gravel, and sand; 3.2 m from the surface.

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
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

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
UT105763.817-139.044Alloway, B. V.1990-01-01 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--Yukon Territory, Canada. Coordinates from Preece et al. (2011). Datum not specified, assumed to be NAD83.13-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. From Preece et al. (2000): Discontinuous, white tephra bed interbedded with carbonaceous silt, gravel and sand. Tephra bed is 3.2 m from surface, immediately beneath the permafrost active layer; deformed. From Preece et al. (2011): 13 cm thick; bubble-wall shards, trace amounts of brown glass; interbedded with carbonaceous silt, gravel, and sand; 3.2 m from the surface.UT1057Tephra FallCumulateGlass 74.37 0.27 13.59 2 0.07 0.21 1.26 4.32 3.74 940EMP2H2O=2.12; Cl=0.18EMP

SAMPLE LOCATION

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