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SAMPLE INFO : 54-D-81
Sample ID:54-D-81
Station ID:54-D-81
Latitude:53.955
Longitude:-166.78398
Datum:NAD83
Date Sampled:1954-01-01
Sample Type 1:Lava
Field Lithology:Basalt
Text Description:
Olivine-bearing feldspathic basalt porphyry from the Makushin volcanics 3 1/4 miles north-northeast of Sugarloaf Cone. It is dark gray to grayish black and contains plagioclase and pyroxene phenocrysts 1-3 millimeters long. Phenocrysts compose 25 percent of the rock: 15 percent sodic bytownite to sodic labradorite, which forms stubby euhedral crystals and fragments having faint oscillatory zones, narrow rims of normal zones, vermicular zones, zones of dusty inclusions, and apatite inclusions; 5 percent euhedral to subhedral augite (?); 4 percent subhedral olivine with pseudomorphs of serpentine (?); 1 percent hypersthene with augite reaction rims; and a trace of anhedral magnetite. The groundmass has intergranular texture and includes abundant subhedral laths and stubby crystals of sodic bytownite to sodic labradorite, and much granular augite(?) and a black opaque mineral. Alteration is sparse; 3 percent of the rock is chlorite(?), which replaces olivine.

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-8153.955-166.78398Drewes, Harald1954-01-01 MakushinMakushin volcanics from 3 mi SW of McLees Lake and 3 1/4 miles north-northeast of Sugarloaf ConeOlivine-bearing feldspathic basalt porphyry from the Makushin volcanics 3 1/4 miles north-northeast of Sugarloaf Cone. It is dark gray to grayish black and contains plagioclase and pyroxene phenocrysts 1-3 millimeters long. Phenocrysts compose 25 percent of the rock: 15 percent sodic bytownite to sodic labradorite, which forms stubby euhedral crystals and fragments having faint oscillatory zones, narrow rims of normal zones, vermicular zones, zones of dusty inclusions, and apatite inclusions; 5 percent euhedral to subhedral augite (?); 4 percent subhedral olivine with pseudomorphs of serpentine (?); 1 percent hypersthene with augite reaction rims; and a trace of anhedral magnetite. The groundmass has intergranular texture and includes abundant subhedral laths and stubby crystals of sodic bytownite to sodic labradorite, and much granular augite(?) and a black opaque mineral. Alteration is sparse; 3 percent of the rock is chlorite(?), which replaces olivine.54-D-81LavaWhole-rock 51.83 0.91 18.28 0.17 5.81 10.26 2.64 0.74 0.14 99.93533XRF3.16.12LOI=0.96XRF 6123533CALC
54-D-8153.955-166.78398Drewes, Harald1954-01-01 MakushinMakushin volcanics from 3 mi SW of McLees Lake and 3 1/4 miles north-northeast of Sugarloaf ConeOlivine-bearing feldspathic basalt porphyry from the Makushin volcanics 3 1/4 miles north-northeast of Sugarloaf Cone. It is dark gray to grayish black and contains plagioclase and pyroxene phenocrysts 1-3 millimeters long. Phenocrysts compose 25 percent of the rock: 15 percent sodic bytownite to sodic labradorite, which forms stubby euhedral crystals and fragments having faint oscillatory zones, narrow rims of normal zones, vermicular zones, zones of dusty inclusions, and apatite inclusions; 5 percent euhedral to subhedral augite (?); 4 percent subhedral olivine with pseudomorphs of serpentine (?); 1 percent hypersthene with augite reaction rims; and a trace of anhedral magnetite. The groundmass has intergranular texture and includes abundant subhedral laths and stubby crystals of sodic bytownite to sodic labradorite, and much granular augite(?) and a black opaque mineral. Alteration is sparse; 3 percent of the rock is chlorite(?), which replaces olivine.54-D-81LavaWhole-rock 51.5 0.9 18.15 8.85 0.17 5.77 10.18 2.62 0.73 0.14 100315NN3.076.06H2OM=0.53; H2OP=0.43; CO2=0.02; Cl=0; F=0.03NN 11.2 392 23.5 units are percent 0.61745XRF: Rb, Sr, Ni; NN: K;
54-D-8153.955-166.78398Drewes, Harald1954-01-01 MakushinMakushin volcanics from 3 mi SW of McLees Lake and 3 1/4 miles north-northeast of Sugarloaf ConeOlivine-bearing feldspathic basalt porphyry from the Makushin volcanics 3 1/4 miles north-northeast of Sugarloaf Cone. It is dark gray to grayish black and contains plagioclase and pyroxene phenocrysts 1-3 millimeters long. Phenocrysts compose 25 percent of the rock: 15 percent sodic bytownite to sodic labradorite, which forms stubby euhedral crystals and fragments having faint oscillatory zones, narrow rims of normal zones, vermicular zones, zones of dusty inclusions, and apatite inclusions; 5 percent euhedral to subhedral augite (?); 4 percent subhedral olivine with pseudomorphs of serpentine (?); 1 percent hypersthene with augite reaction rims; and a trace of anhedral magnetite. The groundmass has intergranular texture and includes abundant subhedral laths and stubby crystals of sodic bytownite to sodic labradorite, and much granular augite(?) and a black opaque mineral. Alteration is sparse; 3 percent of the rock is chlorite(?), which replaces olivine.54-D-81LavaWhole-rock H2OM=0.53; H2OP=0.43; CO2=0.02; Cl=0; F=0.03NN 315

SAMPLE LOCATION

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