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SAMPLE INFO : 53-B-38
Sample ID:53-B-38
Station ID:53-B-38
Latitude:53.88707
Longitude:-166.93202
Datum:NAD83
Date Sampled:1953-01-01
Sample Type 1:Lava
Field Lithology:Basalt
Text Description:
Slightly altered feldspathic basalt porphyry. It is greenish gray to grayish green and contains phenocrysts 1 to 2 millimeters long. Phenocrysts compose 15 percent of the rock : 12 percent sodic labradorite, which forms embayed crystals, euhedral laths, and irregular grains and which contains normal and oscillatory zones and zones of dusty inclusions ; 3 percent augite or diopside, which form euhedral to anhedral crystals and crystal clusters and which alter to chlorite and uralite(?) pseudomorphs ; and a trace of olivine (?) , which appears as chlorite and uralite(?) pseudornorphs. The groundmass has a felty to granular texture and consists of plagioclase, altered pyroxene(?), and a black opaque mineral. Alteration is moderate ; chlorite and uralite (?) replace pyroxene
and olivine (?) .

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
53-B-3853.88707-166.93202Barnett, H. F. J.1953-01-01 MakushinUnalaska formation from 1 1/2 mi NW of Humpback BaySlightly altered feldspathic basalt porphyry. It is greenish gray to grayish green and contains phenocrysts 1 to 2 millimeters long. Phenocrysts compose 15 percent of the rock : 12 percent sodic labradorite, which forms embayed crystals, euhedral laths, and irregular grains and which contains normal and oscillatory zones and zones of dusty inclusions ; 3 percent augite or diopside, which form euhedral to anhedral crystals and crystal clusters and which alter to chlorite and uralite(?) pseudomorphs ; and a trace of olivine (?) , which appears as chlorite and uralite(?) pseudornorphs. The groundmass has a felty to granular texture and consists of plagioclase, altered pyroxene(?), and a black opaque mineral. Alteration is moderate ; chlorite and uralite (?) replace pyroxene and olivine (?) .53-B-38Whole Rock 53.2 0.89 19.98 6.38 0.13 3.66 9.19 2.98 1.44 0.16 99.78315NN3.013.64H2OM=0.37; H2OP=1.52; CO2=0.03NNCl V=0.01, M=NN, R=315;F V=0.03, M=NN, R=315;S V=0.01, M=NN, R=315;

SAMPLE LOCATION

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