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SAMPLE INFO : 54-Sn-55
Sample ID:54-Sn-55
Station ID:54-Sn-55
Latitude:53.88707
Longitude:-166.93202
Datum:NAD83
Date Sampled:1954-01-01
Sample Type 1:Lava
Field Lithology:Dacite
Text Description:
Dacite virophyre from the Unalaska formation at Buttress Point, 10 miles southwest of Kuliliak Bay. It is black and has plagioclase phenocrysts as large as 2.5 millimeters, and amygdules with a diameter of 1 to 4 millimeters. Phenocrysts compose 5 percent of the rock: 4 percent sodic andesine, which forms embayed crystals and euhedral to subhedral laths and stubby crystals, and which has normal zones and apatite inclusions; a trace of subhedral hypersthene; a trace of subhedral augite(?) ; and a trace of subhedral to euhedral ilmenitic magnetite. Microlites of plagioclase are common, and of apatite rare. The groundmass is glass, which is slightly devitrified and altered to chlorite (?) and contains 1 percent zeolite (?) -filled amygdules.

References:
Geology of Unalaska Island and adjacent insular shelf, Aleutian Islands, Alaska

GEOCHEM DATA
StationIDLatitudeLongitudeGeologistDateVisitedAge InfoVolcanoEruptionLocation DescriptionText DescriptionSample IDMaterialSiO2TiO2Al2O3FeOTMnOMgOCaONa2OK2OP2O5Total-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-Sn-5553.88707-166.93202Snyder, G. L.1954-01-01 MakushinUnalaska formation from Buttress PtDacite virophyre from the Unalaska formation at Buttress Point, 10 miles southwest of Kuliliak Bay. It is black and has plagioclase phenocrysts as large as 2.5 millimeters, and amygdules with a diameter of 1 to 4 millimeters. Phenocrysts compose 5 percent of the rock: 4 percent sodic andesine, which forms embayed crystals and euhedral to subhedral laths and stubby crystals, and which has normal zones and apatite inclusions; a trace of subhedral hypersthene; a trace of subhedral augite(?) ; and a trace of subhedral to euhedral ilmenitic magnetite. Microlites of plagioclase are common, and of apatite rare. The groundmass is glass, which is slightly devitrified and altered to chlorite (?) and contains 1 percent zeolite (?) -filled amygdules.54-Sn-55Whole Rock 62.44 0.66 14.48 3.36 0.16 1.07 4.11 3.85 1.1 0.15 99.56315NN1.711.8H2OM=3.87; H2OP=4.51; CO2=0.01NNCl V=0.03, M=NN, R=315;F V=0.04, M=NN, R=315;S V=0.04, M=NN, R=315;

SAMPLE LOCATION

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