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SAMPLE INFO : UA739
Sample ID:UA739
Station ID:UA739
Latitude:66.72
Longitude:-148.45
Datum:NAD83
Sample Type 1:Tephra Fall
Text Description:
The lower tephra bed at this station is the Old Crow tephra; it contains few detrital contaminants, is about 30 cm thick, and is continuous across the l00-m-long exposure. The paleosols are weakly developed and comprise mere horizons of dark gray to black silt, 1-2 cm thick.

References:
Old Crow tephra: a new late Pleistocene stratigraphic marker across North-central Alaska and western Yukon Territory
Discovery of a large-magnitude, late Pleistocene volcanic eruption in Alaska
Correlation techniques in tephra studies

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
UA73966.72-148.45Westgate, J. A. 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).Road cut along the north side of the Fairbanks-Nenana Highway, 3 km east of Halfway House, exposes loess with paleosols and two tephra beds above weathered schist (see Fig. 8 in Westgate et al. 1983).The lower tephra bed at this station is the Old Crow tephra; it contains few detrital contaminants, is about 30 cm thick, and is continuous across the l00-m-long exposure. The paleosols are weakly developed and comprise mere horizons of dark gray to black silt, 1-2 cm thick.UA739Tephra FallCumulateGlass 3.58 1792INAA1.91 85 24.1 53 24 5.2 0.8 0.93 1.2 3.4 3.2 0.57 6.4 0.83 8.9 3.9 6.3 8 1237INAA
UA73966.72-148.45Westgate, J. A. 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).Road cut along the north side of the Fairbanks-Nenana Highway, 3 km east of Halfway House, exposes loess with paleosols and two tephra beds above weathered schist (see Fig. 8 in Westgate et al. 1983).The lower tephra bed at this station is the Old Crow tephra; it contains few detrital contaminants, is about 30 cm thick, and is continuous across the l00-m-long exposure. The paleosols are weakly developed and comprise mere horizons of dark gray to black silt, 1-2 cm thick.UA739Tephra FallCumulateGlassUnclear if averages are reported or if data are individual points of analysis. Standard deviation not reported. 72.62Unclear if averages are reported or if data are individual points of analysis. Standard deviation not reported. 0.41Unclear if averages are reported or if data are individual points of analysis. Standard deviation not reported. 14.19 Unclear if averages are reported or if data are individual points of analysis. Standard deviation not reported. 0.06Unclear if averages are reported or if data are individual points of analysis. Standard deviation not reported. 0.55Unclear if averages are reported or if data are individual points of analysis. Standard deviation not reported. 1.95Unclear if averages are reported or if data are individual points of analysis. Standard deviation not reported. 3.46Unclear if averages are reported or if data are individual points of analysis. Standard deviation not reported. 3.58Unclear if averages are reported or if data are individual points of analysis. Standard deviation not reported. 0.14 1126EMP3.05 24.1 53 23 5.2 0.9 0.93 1.2 3.2 0.57 6.2 0.8 5.1 3.9 6.3 1183INAA
UA73966.72-148.45Westgate, J. A. 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).Road cut along the north side of the Fairbanks-Nenana Highway, 3 km east of Halfway House, exposes loess with paleosols and two tephra beds above weathered schist (see Fig. 8 in Westgate et al. 1983).The lower tephra bed at this station is the Old Crow tephra; it contains few detrital contaminants, is about 30 cm thick, and is continuous across the l00-m-long exposure. The paleosols are weakly developed and comprise mere horizons of dark gray to black silt, 1-2 cm thick.UA739Tephra FallCumulateGlass 24.1 53 23 5.2 0.9 0.93 1.2 3.2 0.57 6.2 0.8 5.1 3.9 6.3 8 1126INAA
UA73966.72-148.45Westgate, J. A. 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).Road cut along the north side of the Fairbanks-Nenana Highway, 3 km east of Halfway House, exposes loess with paleosols and two tephra beds above weathered schist (see Fig. 8 in Westgate et al. 1983).The lower tephra bed at this station is the Old Crow tephra; it contains few detrital contaminants, is about 30 cm thick, and is continuous across the l00-m-long exposure. The paleosols are weakly developed and comprise mere horizons of dark gray to black silt, 1-2 cm thick.UA739Tephra FallCumulateGlass 4.5 1000 25.3 47.7 30 5.55 0.8 1 3.7 0.62 6.8 0.8 9.8 4 7 1792INAA

StationIDLatitudeLongitudeGeologistDateVisitedAge InfoVolcanoEruptionLocation DescriptionText DescriptionSample IDSample Type 1Sample Type 2Final UnitMaterialSiO2TiO2Al2O3FeOTMnOMgOCaONa2OK2OP2O5Total-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
UA73966.72-148.45Westgate, J. A. 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).Road cut along the north side of the Fairbanks-Nenana Highway, 3 km east of Halfway House, exposes loess with paleosols and two tephra beds above weathered schist (see Fig. 8 in Westgate et al. 1983).The lower tephra bed at this station is the Old Crow tephra; it contains few detrital contaminants, is about 30 cm thick, and is continuous across the l00-m-long exposure. The paleosols are weakly developed and comprise mere horizons of dark gray to black silt, 1-2 cm thick.UA739Tephra FallCumulateWhole-rockUnclear if averages are reported or if data are individual points of analysis. Standard deviation not reported. 71.97Unclear if averages are reported or if data are individual points of analysis. Standard deviation not reported. 0.45Unclear if averages are reported or if data are individual points of analysis. Standard deviation not reported. 14.58 Unclear if averages are reported or if data are individual points of analysis. Standard deviation not reported. 0.07Unclear if averages are reported or if data are individual points of analysis. Standard deviation not reported. 0.71Unclear if averages are reported or if data are individual points of analysis. Standard deviation not reported. 2.29 Unclear if averages are reported or if data are individual points of analysis. Standard deviation not reported. 3.41Unclear if averages are reported or if data are individual points of analysis. Standard deviation not reported. 0.21 1126XRF3.37Na2O V=Unclear if averages are reported or if data are individual points of analysis. Standard deviation not reported.2.94, M=FPHOT, R=1126;

SAMPLE LOCATION

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