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SAMPLE INFO : UT1051
Sample ID:UT1051
Station ID:Ash_Bend
Latitude:63.5
Longitude:-137.267
Datum:NAD83
Sample Type 1:Tephra Fall
Text Description:
Wispy, white, discontinuous tephra bed, occurs in the lower silt, 90 cm above tephra UT1052. Crystal-rich with abundant hornblende, plagioclase, and FeTi oxides and minor amounts of hypersthene and apatite. Its glass is mostly in the form of highly inflated pumice, although some chunky glass of low vesicularity is present. Mineral content consists of plagioclase, hornblende, and FeTi oxides with rare amounts of basaltic hornblende and apatite. From Preece et al. (2011): in silt of sedimentary fill incised into the Reid glacial drift; 90 cm above Sheep Creek-K (UT1052). Sample collected by B. Alloway, 1990.

References:
Changing ideas on the identity and stratigraphic significance of the Sheep Creek tephra beds in Alaska and the Yukon Territory, northwestern North America
A catalogue of late Cenozoic tephra beds in the Klondike Goldfields and adjacent areas, Yukon Territory
Field trip guide for the International Field Conference and Workshop on Tephrochronology and Volcanism
Dating Early and Middle (Reid) Pleistocene glaciations in central Yukon by tephrochronology

GEOCHEM DATA
StationIDLatitudeLongitudeGeologistDateVisitedAge InfoVolcanoEruptionLocation DescriptionText DescriptionSample IDSample Type 1Sample Type 2Geologic 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
Ash_Bend63.5-137.267Preece, S. J.< 190000 ± 20000 stratigraphy; 4365; This is the maximum age of all Sheep Creek tephra from Westgate and others (2007), who demonstrated that the Sheep Creek tephra is actually made up of several stratigraphic units.-78050--Ash Bend Section, Stewart River, Yukon Territory, Canada. Type section for the Reid glaciation and early Beringian Bison fossils. Located a few kilometers inside the outer limit of Reid drift, which was deposited during an extensive advance of the Cordilleran Ice Sheet across central Yukon Territory, Canada. The Reid till forms a prominent 10-m-high scarp within a thick, recessive sequence of glaciofluvial gravels at Ash Bend. Coordinates from Preece et al. (2011). Datum not specified, assumed to be NAD83.Wispy, white, discontinuous tephra bed, occurs in the lower silt, 90 cm above tephra UT1052. Crystal-rich with abundant hornblende, plagioclase, and FeTi oxides and minor amounts of hypersthene and apatite. Its glass is mostly in the form of highly inflated pumice, although some chunky glass of low vesicularity is present. Mineral content consists of plagioclase, hornblende, and FeTi oxides with rare amounts of basaltic hornblende and apatite. From Preece et al. (2011): in silt of sedimentary fill incised into the Reid glacial drift; 90 cm above Sheep Creek-K (UT1052). Sample collected by B. Alloway, 1990.UT1051Tephra FallCumulateGlass 71.04 0.11 16.12 2.06 0.05 0.7 3.05 4.51 2.26 10121EMP2.06Cl=0.02; H2O=3.32EMP 0.95 49.4 740 583 13.3 25.4 2.35 8 1.41 0.52 1.24 0.19 1.04 0.21 0.59 0.09 0.65 0.1 6.04 107.3 3.85 2.94 0.23 3.99 1.37 4365ICPMS
Ash_Bend63.5-137.267Preece, S. J.< 190000 ± 20000 stratigraphy; 4365; This is the maximum age of all Sheep Creek tephra from Westgate and others (2007), who demonstrated that the Sheep Creek tephra is actually made up of several stratigraphic units.-78050--Ash Bend Section, Stewart River, Yukon Territory, Canada. Type section for the Reid glaciation and early Beringian Bison fossils. Located a few kilometers inside the outer limit of Reid drift, which was deposited during an extensive advance of the Cordilleran Ice Sheet across central Yukon Territory, Canada. The Reid till forms a prominent 10-m-high scarp within a thick, recessive sequence of glaciofluvial gravels at Ash Bend. Coordinates from Preece et al. (2011). Datum not specified, assumed to be NAD83.Wispy, white, discontinuous tephra bed, occurs in the lower silt, 90 cm above tephra UT1052. Crystal-rich with abundant hornblende, plagioclase, and FeTi oxides and minor amounts of hypersthene and apatite. Its glass is mostly in the form of highly inflated pumice, although some chunky glass of low vesicularity is present. Mineral content consists of plagioclase, hornblende, and FeTi oxides with rare amounts of basaltic hornblende and apatite. From Preece et al. (2011): in silt of sedimentary fill incised into the Reid glacial drift; 90 cm above Sheep Creek-K (UT1052). Sample collected by B. Alloway, 1990.UT1051Tephra FallCumulateGlass 71.04 0.21 16.12 2.06 0.05 0.7 3.05 4.51 2.26 10311EMP2.06Cl=0.02; H2O=3.32EMP 49.4 740 583 13.3 25.4 2.35 8 1.41 0.52 1.24 0.19 1.04 0.2 0.59 0.09 0.65 0.1 6.04 107.3 3.85 294 0.23 3.99 1.37 2.83 10121ICPMS

SAMPLE LOCATION

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