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SAMPLE INFO : 53-F-42
Sample ID:53-F-42
Station ID:53-F-42
Latitude:53.88707
Longitude:-166.93202
Datum:NAD83
Date Sampled:1953-01-01
Sample Type 1:Lava
Field Lithology:Dacite
Text Description:
Albitized dacite (?) porphyry from the Unalaska formation at Hive Bay halfway between Staraya Bay and Udagak Strait. It is light gray and contains chalky plagioclase and ferromagnesian phenocrysts 1 to 2 millimeters long. Phenocrysts compose 1 percent of the rock, consisting of subhedral laths of albite with apatite inclusions. The groundmass has an indistinct intersertal texture and consists of abundant subhedral laths of albite, a trace of a granular black opaque mineral, and a trace of quartz that may be primary. Alteration is intense, albite and kaolin are pervasive and abundant, quartz is common and intersertal; calcite is common and forms scattered patches, especially near altered ferromagnesian minerals; and chlorite and uralite (?) are common alteration products of the ferromagnesian minerals.

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

GEOCHEM DATA
StationIDLatitudeLongitudeGeologistDateVisitedAge InfoVolcanoEruptionLocation DescriptionText DescriptionSample IDSample Type 1Sample Type 2geologic 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
53-F-42 53.88707 -166.93202 Fraser, G. D. 1953-01-01 Makushin Unalaska formation from head of Hive Bay Albitized dacite (?) porphyry from the Unalaska formation at Hive Bay halfway between Staraya Bay and Udagak Strait. It is light gray and contains chalky plagioclase and ferromagnesian phenocrysts 1 to 2 millimeters long. Phenocrysts compose 1 percent of the rock, consisting of subhedral laths of albite with apatite inclusions. The groundmass has an indistinct intersertal texture and consists of abundant subhedral laths of albite, a trace of a granular black opaque mineral, and a trace of quartz that may be primary. Alteration is intense, albite and kaolin are pervasive and abundant, quartz is common and intersertal; calcite is common and forms scattered patches, especially near altered ferromagnesian minerals; and chlorite and uralite (?) are common alteration products of the ferromagnesian minerals. 53-F-42 Lava Whole Rock 67.91 0.65 15.24 3.17 0.11 0.64 1.37 5.35 4 0.14 99.89315NN0.852.4H2OM=0.07; H2OP=0.73; CO2=0.42NNCl V=0.03, M=NN, R=315;F V=0.08, M=NN, R=315;S V=0.01, M=NN, R=315;

SAMPLE LOCATION

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