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SAMPLE INFO : P49Se16
Sample ID:P49Se16
Station ID:P49Se16
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:
Specimen P49Se16 is from the next to the lowest flow exposed on Tuman Head, (104,475' E., 3,450' N.). According to Powers, who collected this specimen, the section here, is largely pyroclastic and rich in bombs and scoria. The flow from which the specimen was collected ranges in thickness from 10 to 20 feet. The rock is dense medium-gray (N 5) olivine-hypersthene basalt, with seriate texture. The plagioclase, in crystals as much as 3 mm in size, averages An77, judging from the average refractive index. The olivine (Fa20) is in grains as much as one-half mm in diameter, and is pale yellowish green in hand specimen. The augite grains, which are as much as 1 mm in diameter, are yellowish green in thin section. Hypersthene prisms are much smaller, on the average. Magnetite and apatite are recognizable accessories.

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
P49Se1651.9288179.5977Powers, H. A.1949-05-01 SemisopochnoiTuman HeadSpecimen P49Se16 is from the next to the lowest flow exposed on Tuman Head, (104,475' E., 3,450' N.). According to Powers, who collected this specimen, the section here, is largely pyroclastic and rich in bombs and scoria. The flow from which the specimen was collected ranges in thickness from 10 to 20 feet. The rock is dense medium-gray (N 5) olivine-hypersthene basalt, with seriate texture. The plagioclase, in crystals as much as 3 mm in size, averages An77, judging from the average refractive index. The olivine (Fa20) is in grains as much as one-half mm in diameter, and is pale yellowish green in hand specimen. The augite grains, which are as much as 1 mm in diameter, are yellowish green in thin section. Hypersthene prisms are much smaller, on the average. Magnetite and apatite are recognizable accessories.P49Se16LavaPochnoi volcanicsWhole-rock 49.8 1.14 18.86 9.44 0.18 5.64 10.48 2.99 0.99 0.32 100.07368NN3.126.61H2OP=0.09; H2OM=0.04; CO2=0.01NN 22 408 19.5 units are percent 0.82745XRF: Rb, Sr, Ni; NN: K;
P49Se1651.9288179.5977Powers, H. A.1949-05-01 SemisopochnoiTuman HeadSpecimen P49Se16 is from the next to the lowest flow exposed on Tuman Head, (104,475' E., 3,450' N.). According to Powers, who collected this specimen, the section here, is largely pyroclastic and rich in bombs and scoria. The flow from which the specimen was collected ranges in thickness from 10 to 20 feet. The rock is dense medium-gray (N 5) olivine-hypersthene basalt, with seriate texture. The plagioclase, in crystals as much as 3 mm in size, averages An77, judging from the average refractive index. The olivine (Fa20) is in grains as much as one-half mm in diameter, and is pale yellowish green in hand specimen. The augite grains, which are as much as 1 mm in diameter, are yellowish green in thin section. Hypersthene prisms are much smaller, on the average. Magnetite and apatite are recognizable accessories.P49Se16LavaPochnoi volcanicsWhole-rock H2OP=0.09; H2OM=0.04; CO2=0.01NN 22.3 102 292 30.3 29.5 110 59.6 201XRF
P49Se1651.9288179.5977Powers, H. A.1949-05-01 SemisopochnoiTuman HeadSpecimen P49Se16 is from the next to the lowest flow exposed on Tuman Head, (104,475' E., 3,450' N.). According to Powers, who collected this specimen, the section here, is largely pyroclastic and rich in bombs and scoria. The flow from which the specimen was collected ranges in thickness from 10 to 20 feet. The rock is dense medium-gray (N 5) olivine-hypersthene basalt, with seriate texture. The plagioclase, in crystals as much as 3 mm in size, averages An77, judging from the average refractive index. The olivine (Fa20) is in grains as much as one-half mm in diameter, and is pale yellowish green in hand specimen. The augite grains, which are as much as 1 mm in diameter, are yellowish green in thin section. Hypersthene prisms are much smaller, on the average. Magnetite and apatite are recognizable accessories.P49Se16LavaPochnoi volcanicsWhole-rock H2OP=0.09; H2OM=0.04; CO2=0.01NN units are percent 0.05units are percent 0.04 units are percent 0.003 units are percent 0.003 0.03units are percent 0.006 0.004units are percent 0.003units are percent 0.02 units are percent 0.003 368SPEC

SAMPLE LOCATION

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