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SAMPLE INFO : UA1274
Sample ID:UA1274
Station ID:Caribou_Creek_2
Latitude:62.87083333333
Longitude:-137.04166666667
Datum:NAD83
Sample Type 1:Tephra Fall
 Text Description:
2 to 3 cm thick. Within sandy-silt overlying gravel. Occurs as discontinuous beds and blebs of tephra approximately 20 cm above the base of stratigraphic unit 2 at this section. Pyroxene and plagioclase present.

References:
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
Old Crow tephra (140 ± 10 ka) constrains penultimate Reid glaciation in central Yukon Territory

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
Caribou_Creek_262.87083333333-137.04166666667Unknown, Unknown 124000 ± 10000 known unit; 10271; Age is approximate. Revised glass fission-track age with re-calibration; four Old Crow Tephra sample glass fission-track ages (UT1434, UT613, UT501, UT613).Gravel pit exposure approximately 1 km west (along the road) from Caribou Creek 1 station. Located on the highest glaciofluvial terrace in the area, approximately 200 m above the Pelly River and ~80 m higher than Caribou Creek 1 station, it comprises three stratigraphic units. Upper surface of the section gently slopes south < 5 degrees. Datum not specified, assumed to be NAD83.2 to 3 cm thick. Within sandy-silt overlying gravel. Occurs as discontinuous beds and blebs of tephra approximately 20 cm above the base of stratigraphic unit 2 at this section. Pyroxene and plagioclase present.UA1274Tephra FallCumulateGlass 75.45 0.29 13 1.74 0.08 0.29 1.48 3.73 3.67 10721EMP1.74Cl=0.28; H2O=4.44EMP 4.23 99 1024 147 24.9 53.3 5.94 24.3 6.01 0.95 5.08 0.91 5.5 1.31 3.47 0.53 3.7 0.57 34.5 247 6.99 10.15 4.52 6.15 10271ICPMS
Caribou_Creek_262.87083333333-137.04166666667Unknown, Unknown 124000 ± 10000 known unit; 10271; Age is approximate. Revised glass fission-track age with re-calibration; four Old Crow Tephra sample glass fission-track ages (UT1434, UT613, UT501, UT613).Gravel pit exposure approximately 1 km west (along the road) from Caribou Creek 1 station. Located on the highest glaciofluvial terrace in the area, approximately 200 m above the Pelly River and ~80 m higher than Caribou Creek 1 station, it comprises three stratigraphic units. Upper surface of the section gently slopes south < 5 degrees. Datum not specified, assumed to be NAD83.2 to 3 cm thick. Within sandy-silt overlying gravel. Occurs as discontinuous beds and blebs of tephra approximately 20 cm above the base of stratigraphic unit 2 at this section. Pyroxene and plagioclase present.UA1274Tephra FallCumulateGlass 75.47 0.29 12.94 1.73 0.07 0.29 1.52 3.69 3.72 10271EMP1.73Cl=0.27; H2O=4.72EMP

SAMPLE LOCATION

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