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SAMPLE INFO : 47AC27
Sample ID:47AC27
Station ID:47AC27
Latitude:52.3488
Longitude:175.909
Datum:NAD83
Date Sampled:1947-01-01
Sample Type 1:Lava
Text Description:
Sample from the main cone. Holocrystalline purplish, somewhat porous rock, with a maximum grain size of 1.5 mm. It consists of about 70% plagioclase, from An70, to An50 in composition, with a median of about An62; about 5% olivine (Fa15), 20% augite, 3% magnetite, and 2% of pseudomorphs of magnetite and augite after hornblende. The texture is intergranular and essentially seriate, as no well-defined break in range of grain sizes is present. The smaller grains of augite, ranging in size from 0.1 to 0.04 mm, are, together with magnetite, interstitial to the somewhat lath-like crystals of plagioclase. The olivine shows a slight color zoning, the outer part having a higher index and slightly darker color, presumably reflecting a higher content of iron.

References:
Geology of Buldir Island, 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
47AC2752.3488175.909Unknown, Unknown1947-01-01 BuldirMain cone of Buldir VolcanoSample from the main cone. Holocrystalline purplish, somewhat porous rock, with a maximum grain size of 1.5 mm. It consists of about 70% plagioclase, from An70, to An50 in composition, with a median of about An62; about 5% olivine (Fa15), 20% augite, 3% magnetite, and 2% of pseudomorphs of magnetite and augite after hornblende. The texture is intergranular and essentially seriate, as no well-defined break in range of grain sizes is present. The smaller grains of augite, ranging in size from 0.1 to 0.04 mm, are, together with magnetite, interstitial to the somewhat lath-like crystals of plagioclase. The olivine shows a slight color zoning, the outer part having a higher index and slightly darker color, presumably reflecting a higher content of iron.47AC27LavaWhole-rock 52.38 0.88 17.12 7.44 0.12 7.7 9.1 0.2Total calculated from mixed methods 100.13272NN3.384.38Cl=0.06; F=0.02; H2OM=0.12; H2OP=0.52NN units are percent 0.02units are percent 0.04n.d. 0 units are percent 0.004 n.d. 0 0.009units are percent 0.02 0.002units are percent 0.009units are percent 0.004n.d. 0units are percent 0.001n.d. 0n.d. 0 272SPECNa2O V=3.53, M=FPHOT, R=272;K2O V=0.8, M=FPHOT, R=272;

SAMPLE LOCATION

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