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SAMPLE INFO : CU1856
Sample ID:CU1856
Station ID:Gardiner_Creek-1
Datum:NAD83
Sample Type 1:Tephra Fall
Text Description:
The tephra contains pumiceous grains up to 1.2 mm in longest dimension. Minerals present as phenocrysts and microphenocrysts include, in order of decreasing abundance, plagioclase (~50%), magnetite, amphibole, apatite, and ilmenite. Glass compositions (normalized as anhydrous) range from about 71.5 to 74.9 wt% silicon dioxide, with a gap between about 73.4 and 74.0 wt% (Fig. 11; Table S1). Mineral abundances and glass compositions closely match those described by Preece et al. (2014) for the White River Ash, and the observed gap in silicon dioxide compositions is similar to that reported for some samples of the White River Ash

References:
Archaeology of the uppermost Tanana Basin: Results of a survey of the Nabesna and Chisana Rivers, East-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
Gardiner_Creek-1Lynch, J. J. 50--Archaeological site near where Gardiner Creek crosses the Alaska Highway, about 2 km south of the highway in the Tanana River Basin. Gardiner Creek-1 (NAB-0478) is located on the southeasternmost tip of the creekThe tephra contains pumiceous grains up to 1.2 mm in longest dimension. Minerals present as phenocrysts and microphenocrysts include, in order of decreasing abundance, plagioclase (~50%), magnetite, amphibole, apatite, and ilmenite. Glass compositions (normalized as anhydrous) range from about 71.5 to 74.9 wt% silicon dioxide, with a gap between about 73.4 and 74.0 wt% (Fig. 11; Table S1). Mineral abundances and glass compositions closely match those described by Preece et al. (2014) for the White River Ash, and the observed gap in silicon dioxide compositions is similar to that reported for some samples of the White River AshCU1856Tephra FallCumulateGlass 73.08 0.24 14.44 1.67 0.058 0.39 1.97 4.5 3.21 0.054 14031EMP1.67Cl=0.333; H2O=1.92EMP

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