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SAMPLE INFO : P49Se4
Sample ID:P49Se4
Station ID:P49Se4
Latitude:51.9288
Longitude:179.5977
Datum:NAD83
Date Sampled:1949-05-01
Sample Type 1:Lava
Sample Type 2:Flow
Field Lithology:Basalt
Final Unit:Pochnoi volcanics
Text Description:
Olivine basalt that is a porphyritic dense medium-gray (N 5) slightly vesicular rock, with intergranular texture. The phenocrysts consist of plagioclase, which averages about An85 (as determined by the average index of refraction); olivine (Fa32 as determined by the mean index of refraction), about 6 percent of the rock and ranging in length from 0.1 to 1 mm; and sparse augite, ranging from 0.1 to 0.25 mm. The groundmass is chiefly plagioclase, averaging An57; augite granules that are apparently pigeonitic, as shown by a 2V of 35o; magnetite; and intersertal brown glass, charged with minute magnetite granules.

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
P49Se451.9288179.5977Powers, H. A.1949-05-01 Semisopochnoi1 1/4 miles S. 32 1/2 degrees E. of Northeast PointOlivine basalt that is a porphyritic dense medium-gray (N 5) slightly vesicular rock, with intergranular texture. The phenocrysts consist of plagioclase, which averages about An85 (as determined by the average index of refraction); olivine (Fa32 as determined by the mean index of refraction), about 6 percent of the rock and ranging in length from 0.1 to 1 mm; and sparse augite, ranging from 0.1 to 0.25 mm. The groundmass is chiefly plagioclase, averaging An57; augite granules that are apparently pigeonitic, as shown by a 2V of 35o; magnetite; and intersertal brown glass, charged with minute magnetite granules.P49Se4LavaPochnoi volcanicsWhole-rock 55.64 1.02 18.61 8.17 0.19 2.8 7.99 3.87 1.02 0.24 99.83368NN2.55.93H2OP=0.32; H2OM=0.11; CO2=0NN 14.1 483 3.7 units are percent 0.85745XRF: Rb, Sr, Ni; NN: K;
P49Se451.9288179.5977Powers, H. A.1949-05-01 Semisopochnoi1 1/4 miles S. 32 1/2 degrees E. of Northeast PointOlivine basalt that is a porphyritic dense medium-gray (N 5) slightly vesicular rock, with intergranular texture. The phenocrysts consist of plagioclase, which averages about An85 (as determined by the average index of refraction); olivine (Fa32 as determined by the mean index of refraction), about 6 percent of the rock and ranging in length from 0.1 to 1 mm; and sparse augite, ranging from 0.1 to 0.25 mm. The groundmass is chiefly plagioclase, averaging An57; augite granules that are apparently pigeonitic, as shown by a 2V of 35o; magnetite; and intersertal brown glass, charged with minute magnetite granules.P49Se4LavaPochnoi volcanicsWhole-rock H2OP=0.32; H2OM=0.11; CO2=0NN 25.8 87.9 182 6.8 17.2 41.6 72.5 201XRF
P49Se451.9288179.5977Powers, H. A.1949-05-01 Semisopochnoi1 1/4 miles S. 32 1/2 degrees E. of Northeast PointOlivine basalt that is a porphyritic dense medium-gray (N 5) slightly vesicular rock, with intergranular texture. The phenocrysts consist of plagioclase, which averages about An85 (as determined by the average index of refraction); olivine (Fa32 as determined by the mean index of refraction), about 6 percent of the rock and ranging in length from 0.1 to 1 mm; and sparse augite, ranging from 0.1 to 0.25 mm. The groundmass is chiefly plagioclase, averaging An57; augite granules that are apparently pigeonitic, as shown by a 2V of 35o; magnetite; and intersertal brown glass, charged with minute magnetite granules.P49Se4LavaPochnoi volcanicsWhole-rock H2OP=0.32; H2OM=0.11; CO2=0NN units are percent 0.08units are percent 0.01 units are percent 0.01 units are percent 0.003 0.02 0.002 units are percent 0.006 units are percent 0.002 368SPEC

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