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SAMPLE INFO : ACT-727
Sample ID:ACT-727
Station ID:ACT-727
Latitude:66.5
Longitude:-163.3
Datum:NAD83
Sample Type 1:Tephra Fall
Text Description:
Lens of ash 1-2 cm thick; occurs in a paleosol developed in a low sand dune capping a beach ridge. Discontinuous horizon that can be traced for several hundred meters. Abundant orthopyroxene, lesser amounts of clinopyroxene and amphibole (horneblend). Clear glass shards on average 50 microns in diameter, consisting largely of bubble wall junctions and platey glass shards, although blocky and pumiceous shards are also present.

References:
Late Pleistocene environments of the western Noatak basin, northwestern Alaska
Age, extent, and climatic significance of the c. 3400 BP Aniakchak tephra, western Alaska, USA

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
ACT-72766.5-163.3Beget, J. E. 3435 ± 40 14C; 7443; Age is approximate. Average of proximal and distal dates; averages calculated using the method of Stuiver and Reimer (1986). See Beget et a. (1992) Table 3.-1480--Imprecise georeference from Figure 1 in Beget et al. (1992). Cape Espenberg on northern Seward Peninsula Lens of ash 1-2 cm thick; occurs in a paleosol developed in a low sand dune capping a beach ridge. Discontinuous horizon that can be traced for several hundred meters. Abundant orthopyroxene, lesser amounts of clinopyroxene and amphibole (horneblend). Clear glass shards on average 50 microns in diameter, consisting largely of bubble wall junctions and platey glass shards, although blocky and pumiceous shards are also present.ACT-727Tephra FallCumulateGlass 71.41 0.45 14.98 0.49 1.73 5.24 2.86 7443EMP2.64Cl=0.19EMP

SAMPLE LOCATION

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