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SAMPLE INFO : UA68
Sample ID:UA68
Station ID:UA68
Latitude:64.017
Longitude:-139.1
Datum:NAD83
Sample Type 1:Tephra Fall
Field Lithology:Rhyolite
Text Description:
3-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. (2011): 3 cm thick; bubble-wall shards, trace amounts of brown glass; in organic silt 1.6 m above gravel; covered by 1.3 m of organic silt; field name HHY-31g.

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
Fission-track ages of late Cenozoic distal tephra beds in the Yukon Territory and Alaska
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
UA6864.017-139.1Hughes, O. L.1968-01-01 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--Hunker Creek, Yukon Territory, Canada. From Preece et al. (2000): Tephra bed 1.6 m above gravel in organic silt; overlain by 1.3 m of organic silt, additional unknown thickness of silt and peat removed in stripping prior to placer mining; valley bottom setting. Coordinates from Preece et al. (2011). Datum not specified, assumed to be NAD83.3-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. (2011): 3 cm thick; bubble-wall shards, trace amounts of brown glass; in organic silt 1.6 m above gravel; covered by 1.3 m of organic silt; field name HHY-31g.UA68Tephra FallCumulateGlass 73.93 0.28 13.67 2.05 0.07 0.21 1.26 4.71 3.66 940EMP2.05H2O=2.16; Cl=0.16EMP

SAMPLE LOCATION

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