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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 2geologic 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_9 51.9531 178.5356 Snyder, G. L. Little Sitkin Patterson 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_9 Lava Whole 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 745XRFK V=1.18, M=NN, R=745;

SAMPLE LOCATION

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Page modified: July 14, 2014 13:37
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