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SAMPLE INFO : 47AC90A
Sample ID:47AC90A
Station ID:47AC90A
Latitude:51.9288
Longitude:179.5977
Datum:NAD83
Date Sampled:1947-01-01
Sample Type 1:Tephra Fall
Sample Type 2:Pumice
Field Lithology:Dacite
Final Unit:CFE - nature unknown
 Text Description:
A fragment of pumice from the relatively thin layer that accumulated at 128,300'E., 273,500'N., in a protected sector of the old cone. This is largely a pumiceous clear glass of index 1.515, containing small shreds of dark-green glass of index 1.554. The clear glass has crystals of labradorite (An57), hypersthene, augite, green hornblende, and apatite.

References:
Geologic reconnaissance of Semisopochnoi Island, western Aleutian Islands, Alaska
Postglacial eruptive history and geochemistry of Semisopochnoi volcano, western Aleutian Islands, Alaska

GEOCHEM DATA
StationIDLatitudeLongitudeGeologistDateVisitedAge InfoVolcanoEruptionLocation DescriptionText DescriptionSample IDSample Type 1Sample Type 2Final UnitMaterialSiO2TiO2Al2O3FeOTMnOMgOCaONa2OK2OP2O5Total-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
47AC90A51.9288179.5977Unknown, Unknown1947-01-01 Semisopochnoi128,300'E, 273,500'NA fragment of pumice from the relatively thin layer that accumulated at 128,300'E., 273,500'N., in a protected sector of the old cone. This is largely a pumiceous clear glass of index 1.515, containing small shreds of dark-green glass of index 1.554. The clear glass has crystals of labradorite (An57), hypersthene, augite, green hornblende, and apatite.47AC90ATephra FallCumulateCFE - nature unknownWhole-rock 60.62 0.74 17.43 5.3 0.17 1.7 4.31 4.37 2.43 0.26 99.54368NN1.93.6H2OP=1.55; H2OM=0.75; CO2=0.02; Cl=0.15; F=0.07NN 58.2 321 6.5 units are percent 2745XRF: Rb, Sr, Ni; NN: K;
47AC90A51.9288179.5977Unknown, Unknown1947-01-01 Semisopochnoi128,300'E, 273,500'NA fragment of pumice from the relatively thin layer that accumulated at 128,300'E., 273,500'N., in a protected sector of the old cone. This is largely a pumiceous clear glass of index 1.515, containing small shreds of dark-green glass of index 1.554. The clear glass has crystals of labradorite (An57), hypersthene, augite, green hornblende, and apatite.47AC90ATephra FallCumulateCFE - nature unknownWhole-rock H2OP=1.55; H2OM=0.75; CO2=0.02; Cl=0.15; F=0.07NN 33.9 197 83.4 5.9 10.8 31.6 68.4 201XRF
47AC90A51.9288179.5977Unknown, Unknown1947-01-01 Semisopochnoi128,300'E, 273,500'NA fragment of pumice from the relatively thin layer that accumulated at 128,300'E., 273,500'N., in a protected sector of the old cone. This is largely a pumiceous clear glass of index 1.515, containing small shreds of dark-green glass of index 1.554. The clear glass has crystals of labradorite (An57), hypersthene, augite, green hornblende, and apatite.47AC90ATephra FallCumulateCFE - nature unknownWhole-rock H2OP=1.55; H2OM=0.75; CO2=0.02; Cl=0.15; F=0.07NN units are percent 0.08units are percent 0.03 units are percent 0.01units are percent 0.02 units are percent 0.002 0.01units are percent 0.0003 0.002 units are percent 0.004 units are percent 0.004 368SPEC

SAMPLE LOCATION

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