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SAMPLE INFO : UA69
Sample ID:UA69
Station ID:UA69
Latitude:63.944
Longitude:-138.977
Datum:NAD83
Sample Type 1:Tephra Fall
Field Lithology:Rhyolite
Text Description:
Maximum thickness of 22 cm; 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): 22 cm thick; bubble-wall shards, trace amounts of brown glass; in grey clay and silt overlying gravel; 1.2 m above gravel; field name CR67-44.

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
UA6963.944-138.977Harington, C. R.1967-01-01 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--Gold Bottom Creek, Yukon Territory, Canada. From Preece et al. (2000): strip cut prepared for placer mining. Section no longer exists. Measuring from creek level, there is 9.4 m of slumped material; 0.35 m of rust-stained sand and gravel are overlain by 1.2 m of dark grey clay and silt; silt is overlain by whitish tephra bed containing twigs; an additional 2.7 m of greyish clay and silt overlies the tephra bed. The section is capped by 0.2-0.3 m of moss and forest litter. Coordinates from Preece et al. (2011). Datum not specified, assumed to be NAD83.Maximum thickness of 22 cm; 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): 22 cm thick; bubble-wall shards, trace amounts of brown glass; in grey clay and silt overlying gravel; 1.2 m above gravel; field name CR67-44.UA69Tephra FallCumulateGlass 74.32 0.22 13.74 2.02 0.06 0.21 1.26 4.32 3.66 940EMP2.02H2O=2.64; Cl=0.18EMP

SAMPLE LOCATION

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