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SAMPLE INFO : Ahklun Mountains-Tephra-A(Aniakchak)-Pop.1_average
Sample ID:Ahklun Mountains-Tephra-A(Aniakchak)-Pop.1_average
Station ID:Ahklun_Mountains_Regional_Tephra
Latitude:59.6
Longitude:-160.39998
Datum:NAD83
Sample Type 1:Tephra Fall
Text Description:
Average composition of samples from Lone Spruce Pond (UA1963), Sunday Pond (UA1780), Little Swift Lake (Axford and Kaufman 2004) (UA1967), Waskey Lake (Levy et al. 2004) (UA1968), Arolik Lake (Kaufman et al. 2003) (UA1970), and subsamples from three levels in the soil pit near Cascade Lake (Kathan 2006) (UA1975, UA1976, UA1977). This tephra comprises the thickest bed in all lakes from the region (likely including Nimgun Lake, which was not analyzed and somewhat older than expected), and is essentially ubiquitous in outcrops and soil pits across the landscape. Tephra A contains a high percentage of bubble-wall and tricuspate shards, platy glass, elongate pumice, and pumice with large vesicles. Less common are blocky glass and pumice, which are occasionally crystal-rich. Brown and clear glass shards are present in roughly the same proportion.

References:
Late glacial and Holocene glacier and vegetation fluctuations at Little Swift Lake, Southwestern Alaska, U.S.A.
Late Quaternary tephrostratigraphy, Ahklun Mountains, SW Alaska
A 33,000 year record of environmental change from Arolik Lake, Ahklun Mountains, Alaska
Late Holocene climate fluctuations at Cascade Lake, northeastern Ahklun Mountains, southwestern 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
Ahklun_Mountains_Regional_Tephra59.6-160.39998Kaufman, D. S. -1480--Ahklun Mountains, southwest Alaska; glass compositions are averages calculated from analyses of multiple correlated tephra present in lacustrine cores from the area. Individual sample IDs (analyses of which contribute to the average tephra bed composition) are noted in the sample descriptions.Average composition of samples from Lone Spruce Pond (UA1963), Sunday Pond (UA1780), Little Swift Lake (Axford and Kaufman 2004) (UA1967), Waskey Lake (Levy et al. 2004) (UA1968), Arolik Lake (Kaufman et al. 2003) (UA1970), and subsamples from three levels in the soil pit near Cascade Lake (Kathan 2006) (UA1975, UA1976, UA1977). This tephra comprises the thickest bed in all lakes from the region (likely including Nimgun Lake, which was not analyzed and somewhat older than expected), and is essentially ubiquitous in outcrops and soil pits across the landscape. Tephra A contains a high percentage of bubble-wall and tricuspate shards, platy glass, elongate pumice, and pumice with large vesicles. Less common are blocky glass and pumice, which are occasionally crystal-rich. Brown and clear glass shards are present in roughly the same proportion.Ahklun Mountains-Tephra-A(Aniakchak)-Pop.1_averageTephra FallCumulateGlass 59.02 1.37 16.5 7.59 0.21 2.81 6.41 4.42 1.55 7993EMP7.59Cl=0.12; H2O=2.51EMP

SAMPLE LOCATION

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Page modified: August 1, 2017 15:29
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