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SAMPLE INFO : 47AC116
Sample ID:47AC116
Station ID:47AC116
Latitude:51.94683
Longitude:179.55766
Datum:NAD83
Date Sampled:1947-01-01
Sample Type 1:Lava
Field Lithology:Andesite
Final Unit:Threequarter Cone
Text Description:
Andesite vitrophyre from an agglomerate from Three-quarter Cone (121,700' E, 291,900' N). This is a dark-gray rock, aphanitic, with small tabular plagioclase phenocrysts showing a parallel arrangement. About 5 percent of the rock is plagioclase phenocrysts (1 mm in diameter), having an average composition of An58. A few phenocrysts are hypersthene and olivine. The groundmass is mostly plagioclase microlites (0.05 mm long), minute granules of augite(?), and magnetite dust, in brown glass, having an index of 1.546.

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
47AC11651.94683179.55766Unknown, Unknown1947-01-01 Three-quarter coneThree-quarter Cone (121,700' E, 291,900' N)Andesite vitrophyre from an agglomerate from Three-quarter Cone (121,700' E, 291,900' N). This is a dark-gray rock, aphanitic, with small tabular plagioclase phenocrysts showing a parallel arrangement. About 5 percent of the rock is plagioclase phenocrysts (1 mm in diameter), having an average composition of An58. A few phenocrysts are hypersthene and olivine. The groundmass is mostly plagioclase microlites (0.05 mm long), minute granules of augite(?), and magnetite dust, in brown glass, having an index of 1.546.47AC116LavaThreequarter ConeWhole-rock 59.21 1.03 17.13 7.82 0.2 2.65 6.28 4.38 1.81 0.38 99.09368NN2.095.85H2OP=0.08; H2OM=0.02; CO2=0.01NN 39.8 415 5.7 units are percent 1.49745XRF: Rb, Sr, Ni; NN: K;
47AC11651.94683179.55766Unknown, Unknown1947-01-01 Three-quarter coneThree-quarter Cone (121,700' E, 291,900' N)Andesite vitrophyre from an agglomerate from Three-quarter Cone (121,700' E, 291,900' N). This is a dark-gray rock, aphanitic, with small tabular plagioclase phenocrysts showing a parallel arrangement. About 5 percent of the rock is plagioclase phenocrysts (1 mm in diameter), having an average composition of An58. A few phenocrysts are hypersthene and olivine. The groundmass is mostly plagioclase microlites (0.05 mm long), minute granules of augite(?), and magnetite dust, in brown glass, having an index of 1.546.47AC116LavaThreequarter ConeWhole-rock H2OP=0.08; H2OM=0.02; CO2=0.01NN units are percent 0.07units are percent 0.07 units are percent 0.01units are percent 0.02 units are percent 0.003 0.02 0.002 units are percent 0.001 units are percent 0.003 368SPEC

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