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SAMPLE INFO : 47AC30
Sample ID:47AC30
Station ID:47AC30
Latitude:52.36142
Longitude:175.93775
Datum:NAD83
Date Sampled:1947-01-01
Sample Type 1:Lava
Sample Type 2:Dome
Field Lithology:Basalt
 Text Description:
Sample of the dome on the flank of East Cape Volcano. This sample is hypersthene-bearing hornblende basalt, pale gray, porous in structure, with a faint lineation due to the orientation of the hornblende prisms. About 4/5 of the coarser part of the rock consists of plagioclase grains from 0.02 to 0.6 mm in size, with an average composition of An55. Hornblende, about 10% by volume, is greenish brown, and the needles are from 0.02 to 2 mm long. The hypersthene prisms, which form about 3 % of the rock, are from 0.02 to 0.4 mm in length. Magnetite grains make up about 2% and augite about 1% of the rock. Traces of apatite, olivine (Fa18), and glass (n=1.515) are present. A small amount of analcime(?) appears to replace both glass and plagioclase. The groundmass, which forms about 20% of the whole rock, consists of unoriented augite needles, averaging about 0.0002 by 0.02 mm in size, plagioclase crystals, 0.01 by 0.02 mm, and magnetite granules, in glass.

References:
Geology of Buldir Island, 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
47AC3052.36142175.93775Unknown, Unknown1947-01-01 East CapeDome on flank of East Cape VolcanoSample of the dome on the flank of East Cape Volcano. This sample is hypersthene-bearing hornblende basalt, pale gray, porous in structure, with a faint lineation due to the orientation of the hornblende prisms. About 4/5 of the coarser part of the rock consists of plagioclase grains from 0.02 to 0.6 mm in size, with an average composition of An55. Hornblende, about 10% by volume, is greenish brown, and the needles are from 0.02 to 2 mm long. The hypersthene prisms, which form about 3 % of the rock, are from 0.02 to 0.4 mm in length. Magnetite grains make up about 2% and augite about 1% of the rock. Traces of apatite, olivine (Fa18), and glass (n=1.515) are present. A small amount of analcime(?) appears to replace both glass and plagioclase. The groundmass, which forms about 20% of the whole rock, consists of unoriented augite needles, averaging about 0.0002 by 0.02 mm in size, plagioclase crystals, 0.01 by 0.02 mm, and magnetite granules, in glass.47AC30LavaWhole-rock 61 0.68 16.74 5.26 0.13 3.51 6.91 0.29Total calculated from mixed methods 99.86272NN2.962.58Cl=0.1; F=0.02; H2OM=0.1; H2OP=0.44NN units are percent 0.03units are percent 0.06n.d. 0 units are percent 0.006 n.d. 0 0.006units are percent 0.004 0.001units are percent 0.002units are percent 0.003n.d. 0units are percent 0.001n.d. 0n.d. 0 272SPECNa2O V=3.71, M=FPHOT, R=272;K2O V=1.1, M=FPHOT, R=272;

SAMPLE LOCATION

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