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SAMPLE INFO : J127
Sample ID:J127
Station ID:Jan_Lake
Latitude:63.574444
Longitude:-143.917222
Datum:NAD83
Sample Type 1:Tephra Fall
Text Description:
Vesicular, blocky, and pumiceous shards, commonly with mineral inclusions, forming a discrete layer < 1mm thick. Glass chemistry has a high and narrow range of SiO2 and distinctively low K2O values.

References:
Chronology and glass chemistry of tephra and cryptotephra horizons from lake sediments in northern 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
Jan_Lake63.574444-143.917222Unknown, Unknown0000-00-00 4530 ± 290 14C AMS; 13071; Age is approximate. Two sigma modeled age range for the tephra based on radiocarbon age model of the core.Jane Lake, in eastern interior Alaska, lies c. 3 km west and 50 m above the current active floodplain of the Tanana River Valley, about 130 km west of the Canadian border (see Carlson and Finney, 2004). Downwind of volcanic sources in the Aleutian arc and Peninsula. Coordinates provided as degrees/minutes/seconds and converted to decimal degrees. Datum not specified, assumed to be NAD83.Vesicular, blocky, and pumiceous shards, commonly with mineral inclusions, forming a discrete layer < 1mm thick. Glass chemistry has a high and narrow range of SiO2 and distinctively low K2O values. J127Tephra FallCumulateGlass 76.72 0.28 12.95 1.49 0.08 0.37 2.16 3.99 1.66 0.04 10013071EMP1.49Cl=0.27; H2O=3.11EMP

SAMPLE LOCATION

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