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SAMPLE INFO : 54-D-67
Sample ID:54-D-67
Station ID:54-D-67
Latitude:53.973
Longitude:-166.671
Datum:NAD83
Date Sampled:1954-01-01
Sample Type 1:Lava
Sample Type 2:Flow
Field Lithology:Basalt
Text Description:
Olivine basalt porphyry from a flow of Eider Point basalt 1 mile northeast of Tabletop Mountain. It is grayish red purple to medium gray and contains plagioclase phenocrysts as long as 1 mm. Phenocrysts compose 20 percent of the rock: 10 percent bytownite, which forms euhedral laths, stubby crystals, and fragments, and which has normal zones, apatite inclusions, and rare vermicular inclusions; 5 percent augite (?), which forms euhedral to subhedhral crystals and crystal clusters, and which has apatite inclusions; 5 percent subhedral to anhedral and embayed olivine. The groundmass has an intergranular texture, with stubby crystals and 25 percent vugs, and consists of abundant euhedral to subhedral plagioclase, much subhedral to granular augite(?) and a black opaque mineral, and a trace of olivine. Alteration is sparse; olivine and the black opaque mineral alter to hematite and limonite.

References:
Geology of Unalaska Island and adjacent insular shelf, 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
54-D-6753.973-166.671Drewes, Harald1954-01-01 Table Top MtnEider Point basalt from 1/2 mi NE of Tabletop MtnOlivine basalt porphyry from a flow of Eider Point basalt 1 mile northeast of Tabletop Mountain. It is grayish red purple to medium gray and contains plagioclase phenocrysts as long as 1 mm. Phenocrysts compose 20 percent of the rock: 10 percent bytownite, which forms euhedral laths, stubby crystals, and fragments, and which has normal zones, apatite inclusions, and rare vermicular inclusions; 5 percent augite (?), which forms euhedral to subhedhral crystals and crystal clusters, and which has apatite inclusions; 5 percent subhedral to anhedral and embayed olivine. The groundmass has an intergranular texture, with stubby crystals and 25 percent vugs, and consists of abundant euhedral to subhedral plagioclase, much subhedral to granular augite(?) and a black opaque mineral, and a trace of olivine. Alteration is sparse; olivine and the black opaque mineral alter to hematite and limonite.54-D-67LavaWhole-rock 49.64 0.96 17.85 0.2 6.42 11.23 2.41 0.76 0.2 100.28533XRF6.723.61LOI=0.56XRF 6309533CALC
54-D-6753.973-166.671Drewes, Harald1954-01-01 Table Top MtnEider Point basalt from 1/2 mi NE of Tabletop MtnOlivine basalt porphyry from a flow of Eider Point basalt 1 mile northeast of Tabletop Mountain. It is grayish red purple to medium gray and contains plagioclase phenocrysts as long as 1 mm. Phenocrysts compose 20 percent of the rock: 10 percent bytownite, which forms euhedral laths, stubby crystals, and fragments, and which has normal zones, apatite inclusions, and rare vermicular inclusions; 5 percent augite (?), which forms euhedral to subhedhral crystals and crystal clusters, and which has apatite inclusions; 5 percent subhedral to anhedral and embayed olivine. The groundmass has an intergranular texture, with stubby crystals and 25 percent vugs, and consists of abundant euhedral to subhedral plagioclase, much subhedral to granular augite(?) and a black opaque mineral, and a trace of olivine. Alteration is sparse; olivine and the black opaque mineral alter to hematite and limonite.54-D-67LavaWhole-rock 49.7 0.96 17.9 9.6 0.2 6.4 11.2 2.4 0.76 0.2Total not given in table. 100.29315RAPIDA6.73.6H2OM=0.08; H2OP=0.48; CO2=0.05RAPIDA units are percent 0.04units are percent 0.1 units are percent 0 units are percent 0units are percent 0.004 units are percent 0 units are percent 0.006 0.03units are percent 0.004 0.004units are percent 0.002units are percent 0.02 units are percent 0units are percent 0 315NN

SAMPLE LOCATION

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