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SAMPLE INFO : 4
Sample ID:4
Station ID:4
Latitude:51.9531
Longitude:178.5356
Datum:NAD83
Sample Type 1:Lava
Field Lithology:Andesite
Text Description:
Andesite of Williwaw Cove formation. Color: medium light gray (N 6). Texture: holocrystalline, porphyritic with both feldspar and pyroxene phenocrysts as much as 4 mm long. Plagioclase, 45-60 percent, ranges in composition from An45 to An60 and averages An51; complex oscillatory zoning and graphic fritting common within individual plagioclase grains. Subhedral clinopyroxene, 10 percent; euhedral orthopyroxene, 10 percent; and anhedral olivine, 1 percent, characterized by brown stains on some fractures. Anhedral magnetite, 5 percent, particularly abundant. Groundmass consists of mesh of feldspar and pyroxene microlites and magnetite dust. Groundmass plagioclase averages An43.

References:
Geology of Little Sitkin Island, Alaska

GEOCHEM DATA
StationIDLatitudeLongitudeGeologistDateVisitedVolcanoEruptionLocation DescriptionText DescriptionSample IDMaterialSiO2TiO2Al2O3FeOTMnOMgOCaONa2OK2OP2O5Total-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
451.9531178.5356Snyder, G. L.Little SitkinWilliwaw Cove formation from coast in Williwaw Cove near "Shack"Andesite of Williwaw Cove formation. Color: medium light gray (N 6). Texture: holocrystalline, porphyritic with both feldspar and pyroxene phenocrysts as much as 4 mm long. Plagioclase, 45-60 percent, ranges in composition from An45 to An60 and averages An51; complex oscillatory zoning and graphic fritting common within individual plagioclase grains. Subhedral clinopyroxene, 10 percent; euhedral orthopyroxene, 10 percent; and anhedral olivine, 1 percent, characterized by brown stains on some fractures. Anhedral magnetite, 5 percent, particularly abundant. Groundmass consists of mesh of feldspar and pyroxene microlites and magnetite dust. Groundmass plagioclase averages An43.4Whole Rock 55.52 0.87 18.07 8.17 0.16 4.25 8.7 3.04 0.91 0.16 100.02424NN2.915.53H2OM=0.06; H2OP=0.05; CO2=0.01NN 12.3 307 8.7 745XRFB V=0.001, M=SPEC, R=424;K V=0.76, M=NN, R=745;Yb V=0.0003, M=SPEC, R=424;Y V=0.002, M=SPEC, R=424;Zr V=0.007, M=SPEC, R=424;Ni V=0.0008, M=SPEC, R=424;Co V=0.003, M=SPEC, R=424;Cr V=0.002, M=SPEC, R=424;Cu V=0.008, M=SPEC, R=424;V V=0.02, M=SPEC, R=424;Ga V=0.001, M=SPEC, R=424;Sc V=0.002, M=SPEC, R=424;
451.9531178.5356Snyder, G. L.Little SitkinWilliwaw Cove formation from coast in Williwaw Cove near "Shack"Andesite of Williwaw Cove formation. Color: medium light gray (N 6). Texture: holocrystalline, porphyritic with both feldspar and pyroxene phenocrysts as much as 4 mm long. Plagioclase, 45-60 percent, ranges in composition from An45 to An60 and averages An51; complex oscillatory zoning and graphic fritting common within individual plagioclase grains. Subhedral clinopyroxene, 10 percent; euhedral orthopyroxene, 10 percent; and anhedral olivine, 1 percent, characterized by brown stains on some fractures. Anhedral magnetite, 5 percent, particularly abundant. Groundmass consists of mesh of feldspar and pyroxene microlites and magnetite dust. Groundmass plagioclase averages An43.4Whole Rock H2OM=0.06; H2OP=0.05; CO2=0.01NNBa V=0.02, M=SPEC, R=424;Sr V=0.06, M=SPEC, R=424;

SAMPLE LOCATION

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