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SAMPLE INFO : UT738
Sample ID:UT738
Station ID:Ester_II
Latitude:64.8
Longitude:-148
Datum:NAD83
Sample Type 1:Tephra Fall
Text Description:
Pods up to 15 cm thick. Occurs as gritty, discontinuous pods with a maximum size of 30 by 15 cm. Many silt stringers occur within the ash, giving it a greyish color. Cleaner ash pods are white in color. Mafic minerals are uniformly distributed through the pods, and locally charcoal, peat blebs, and Fe-oxide nodules are found. Sharp upper and lower contacts between the larger pods and the loess, whereas small pods and pods with many silt stringers have more diffuse contacts. The edges of the pods commonly interfinger with a greyish silt that is restricted to the immediate vicinity of the pods and contains charcoal layers. The tephra is subhorizontal over 1.5 m and repeats vertically over 14 cm due to solifluction.

References:
Tephrostratigraphy of the late Cenozoic Gold Hill loess, Fairbanks area, Alaska
Tephrochronology of late Cenozoic loess at Fairbanks, central Alaska
The Dawson Cut Forest Bed in the Fairbanks area, Alaska, is about two million years old
Late Pliocene Dawson Cut forest bed and new tephrochronological findings in the Gold Hill Loess, east-central Alaska
A 3-my record of Pliocene-Pleistocene loess in interior 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
Ester_II64.8-148Preece, S. J. 1030000 ± 100000 glass - FT; 996; Age is approximate. Weighted mean average of three dates obtained on sample UT738. See Preece and others (1999) for methods.Exposure of Gold Hill Loess in the Ester mining region, an upland remnant created by mining activity, Ester, Alaska. Location imprecisely georeferenced from Figure 4 in Preece et al. (1999). Pods up to 15 cm thick. Occurs as gritty, discontinuous pods with a maximum size of 30 by 15 cm. Many silt stringers occur within the ash, giving it a greyish color. Cleaner ash pods are white in color. Mafic minerals are uniformly distributed through the pods, and locally charcoal, peat blebs, and Fe-oxide nodules are found. Sharp upper and lower contacts between the larger pods and the loess, whereas small pods and pods with many silt stringers have more diffuse contacts. The edges of the pods commonly interfinger with a greyish silt that is restricted to the immediate vicinity of the pods and contains charcoal layers. The tephra is subhorizontal over 1.5 m and repeats vertically over 14 cm due to solifluction.UT738Tephra FallCumulateGlass 76.65 0.23 13.94 1.1Reported analytical value of zero. Reported standard deviation value of zero. 0 0.23 1.98 3.86 2.12 90.8356EMP1.1Cl=0.24EMP 0.95 45 1120 608 17.26 32.6 10.6 1.86 0.54 0.15 0.59 0.11 2.16 0.39 5.24 1.37 1.44 7.62 56 56INAA
Ester_II64.8-148Preece, S. J. 1030000 ± 100000 glass - FT; 996; Age is approximate. Weighted mean average of three dates obtained on sample UT738. See Preece and others (1999) for methods.Exposure of Gold Hill Loess in the Ester mining region, an upland remnant created by mining activity, Ester, Alaska. Location imprecisely georeferenced from Figure 4 in Preece et al. (1999). Pods up to 15 cm thick. Occurs as gritty, discontinuous pods with a maximum size of 30 by 15 cm. Many silt stringers occur within the ash, giving it a greyish color. Cleaner ash pods are white in color. Mafic minerals are uniformly distributed through the pods, and locally charcoal, peat blebs, and Fe-oxide nodules are found. Sharp upper and lower contacts between the larger pods and the loess, whereas small pods and pods with many silt stringers have more diffuse contacts. The edges of the pods commonly interfinger with a greyish silt that is restricted to the immediate vicinity of the pods and contains charcoal layers. The tephra is subhorizontal over 1.5 m and repeats vertically over 14 cm due to solifluction.UT738Tephra FallCumulateGlass 76.02 0.15 14.24 1.19 0.07 0.39 1.99 3.58 2.15 4792EMP1.19Cl=0.23; H2O=5.44EMP 0.95 1120 17.26 32.6 10.6 1.86 0.54 0.15 0.59 0.11 2.16 0.39 5.24 1.37 1.44 55 996INAA
Ester_II64.8-148Preece, S. J. 1030000 ± 100000 glass - FT; 996; Age is approximate. Weighted mean average of three dates obtained on sample UT738. See Preece and others (1999) for methods.Exposure of Gold Hill Loess in the Ester mining region, an upland remnant created by mining activity, Ester, Alaska. Location imprecisely georeferenced from Figure 4 in Preece et al. (1999). Pods up to 15 cm thick. Occurs as gritty, discontinuous pods with a maximum size of 30 by 15 cm. Many silt stringers occur within the ash, giving it a greyish color. Cleaner ash pods are white in color. Mafic minerals are uniformly distributed through the pods, and locally charcoal, peat blebs, and Fe-oxide nodules are found. Sharp upper and lower contacts between the larger pods and the loess, whereas small pods and pods with many silt stringers have more diffuse contacts. The edges of the pods commonly interfinger with a greyish silt that is restricted to the immediate vicinity of the pods and contains charcoal layers. The tephra is subhorizontal over 1.5 m and repeats vertically over 14 cm due to solifluction.UT738Tephra FallCumulateGlass 76.65 0.23 13.94 1.1 1.98 3.86 2.12 996EMP1.1Cl=0.24; H2O=9.17EMP

SAMPLE LOCATION

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