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SAMPLE INFO : UT804
Sample ID:UT804
Station ID:Gold_Hill_III
Latitude:64.9
Longitude:-147.9
Datum:NAD83
Sample Type 1:Tephra Fall
Text Description:
Coarse and medium sand-sized white tephra with abundant mafic minerals and charcoal flecks. Interbedded with 2.5Y6/2 and 10YR5/4 silt and organic bands that are intensely soliflucted. Primary stratigraphic context, although deformed by solifluction so that ash horizons repeat vertically over a 65 cm interval. Lenses of ash have a maximum thickness of 3.5 cm and are composed of smaller lenses with a maximum thickness of 1.2 cm, separated by loess stringers. Lenses are usually isolated, but sometimes linked by mm thick wisps of tephra. Distinct ash-loess contacts that undulate with some localized shearing. Mafic minerals and charcoal form dark clusters in the ash that do not have any particular orientation.

References:
Geochemical variation in the less than 5 Ma Wrangell Volcanic Field, Alaska, with an emphasis on the Skookum Creek volcanic complex
Tephrostratigraphy of the late Cenozoic Gold Hill loess, Fairbanks area, Alaska
Tephrochronology of late Cenozoic loess at Fairbanks, central Alaska

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
Gold_Hill_III64.9-147.9Preece, S. J.< 2020000 ± 140000 stratigraphy; 996; Weighted mean average of two dates obtained on sample UT497, which is strategraphically below this sample (therefore this sample is younger). See Preece and others (1999) for methods.Trench dug down to the cliff face on the north side of the Gold Hill mining cut, Fairbanks, Alaska; located approximately 30 m to the east of station Preece_1999_Gold_Hill_II. Location imprecisely georeferenced from Figure 4 in Preece et al. (1999). Coarse and medium sand-sized white tephra with abundant mafic minerals and charcoal flecks. Interbedded with 2.5Y6/2 and 10YR5/4 silt and organic bands that are intensely soliflucted. Primary stratigraphic context, although deformed by solifluction so that ash horizons repeat vertically over a 65 cm interval. Lenses of ash have a maximum thickness of 3.5 cm and are composed of smaller lenses with a maximum thickness of 1.2 cm, separated by loess stringers. Lenses are usually isolated, but sometimes linked by mm thick wisps of tephra. Distinct ash-loess contacts that undulate with some localized shearing. Mafic minerals and charcoal form dark clusters in the ash that do not have any particular orientation.UT804Tephra FallCumulateGlass 76.96 0.22 13.75 0.95Reported analytical value of zero. Reported standard deviation value of zero. 0 0.26 1.58 4.03 2.32 56EMP0.95Cl=0.26; H2O=6.15EMP 1093 570 35.4 11.1 1.86 0.54 0.61 0.13 5.63 1.72 1.4 38 55INAA: Ba, Ce, Nd, Sm, Eu, Yb, Lu, Th, U, Sc, Zn; LA-ICP: Sr;
Gold_Hill_III64.9-147.9Preece, S. J.< 2020000 ± 140000 stratigraphy; 996; Weighted mean average of two dates obtained on sample UT497, which is strategraphically below this sample (therefore this sample is younger). See Preece and others (1999) for methods.Trench dug down to the cliff face on the north side of the Gold Hill mining cut, Fairbanks, Alaska; located approximately 30 m to the east of station Preece_1999_Gold_Hill_II. Location imprecisely georeferenced from Figure 4 in Preece et al. (1999). Coarse and medium sand-sized white tephra with abundant mafic minerals and charcoal flecks. Interbedded with 2.5Y6/2 and 10YR5/4 silt and organic bands that are intensely soliflucted. Primary stratigraphic context, although deformed by solifluction so that ash horizons repeat vertically over a 65 cm interval. Lenses of ash have a maximum thickness of 3.5 cm and are composed of smaller lenses with a maximum thickness of 1.2 cm, separated by loess stringers. Lenses are usually isolated, but sometimes linked by mm thick wisps of tephra. Distinct ash-loess contacts that undulate with some localized shearing. Mafic minerals and charcoal form dark clusters in the ash that do not have any particular orientation.UT804Tephra FallCumulateGlass Cl=0.26; H2O=6.15EMP 0.95 45 1093 570 18 35.4 11.1 1.86 0.54 0.1 0.61 0.13 1.92 0.47 5.63 1.72 1.4 4.5 38 56INAA

SAMPLE LOCATION

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