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SAMPLE INFO : Snyder_1959_9
Sample ID:Snyder_1959_9
Station ID:Snyder_1959_9
Latitude:51.9531
Longitude:178.5356
Datum:NAD83
Sample Type 1:Lava
Field Lithology:Dacite
 Text Description:
Low-silica dacite of the Patterson Point formation. Color: light brownish gray (5 YR 6/1). Texture: hypocrystalline, vesicular with "hairy" pumice developed locally, porphyritic with pyroxene and feldspar phenocrysts as much as 3 mm long. Plagioclase, 25-30 percent, varies from An43 to An70 and has an average composition of An51; subgraphic areas of brownish glass and two-fluid negative crystals are included within the plagioclase. Clinopyroxene, 5 percent, and orthopyroxene, 4 percent, in part form agglomerations with magnetite-ilmenite, 1 percent. Groundmass consists of clear pink to brown glass (N=1.506) containing many small gas bubbles.

References:
Geology of Little Sitkin Island, 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
Snyder_1959_951.9531178.5356Snyder, G. L. Little SitkinPatterson Point formation, from stream cut 0.9 mile north of the summit of the 1,980-foot mountain.Low-silica dacite of the Patterson Point formation. Color: light brownish gray (5 YR 6/1). Texture: hypocrystalline, vesicular with "hairy" pumice developed locally, porphyritic with pyroxene and feldspar phenocrysts as much as 3 mm long. Plagioclase, 25-30 percent, varies from An43 to An70 and has an average composition of An51; subgraphic areas of brownish glass and two-fluid negative crystals are included within the plagioclase. Clinopyroxene, 5 percent, and orthopyroxene, 4 percent, in part form agglomerations with magnetite-ilmenite, 1 percent. Groundmass consists of clear pink to brown glass (N=1.506) containing many small gas bubbles.Snyder_1959_9LavaWhole-rock 60.67 0.72 17.02 5.7 0.13 2.7 6.11 3.74 1.43 0.16 99.74424NN2.533.42H2OM=0.17; H2OP=1.39; CO2=0.01NN 29.3 263 8.2 units are percent 1.18745XRF: Rb, Sr, Ni; NN: K;

SAMPLE LOCATION

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