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SAMPLE INFO : 46AC13
Sample ID:46AC13
Station ID:46AC13
Latitude:51.9898
Longitude:-176.58705
Datum:NAD83
Date Sampled:1946-01-01
Sample Type 1:Lava
Field Lithology:Andesite
Text Description:
Blotched and streaky hornblende andesite lava, with some strands of light brownish-gray (5YR 7/1) and others medium light gray (N6). Texture seriate, with conspicuous crystals of plagioclase and hornblende up to 2 mm, sparser and smaller crystals of augite and olivine up to 0.2 mm. The median composition of the coarser plagioclase crystals is about An58. The hornblende is typical "basaltic" hornblende, with small extinction angle, and is pleochroic from red-brown to yellow. The maximum index of about 1.743 and the minimum index about 1.678. The salite has nX 1.68, suggesting about Ca60Mg40Fe10. Accessories include apatite, as pseudodichroic stubby prisms, and magnetite. Much hematitic dust is present in the groundmass, which consists principally of anhedral oligoclase (?), tridymite (?), magnetite, and needles of augite.

References:
Magmatic differentiation in Tertiary and Quaternary volcanic rocks from Adak and Kanaga Islands, 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
46AC1351.9898-176.58705Unknown, Unknown1946-01-01 AdagdakPart of older composite cone, from summit of ridge, 3,400 feet south 21 degrees east of summit of Mt. Adagdak.Blotched and streaky hornblende andesite lava, with some strands of light brownish-gray (5YR 7/1) and others medium light gray (N6). Texture seriate, with conspicuous crystals of plagioclase and hornblende up to 2 mm, sparser and smaller crystals of augite and olivine up to 0.2 mm. The median composition of the coarser plagioclase crystals is about An58. The hornblende is typical "basaltic" hornblende, with small extinction angle, and is pleochroic from red-brown to yellow. The maximum index of about 1.743 and the minimum index about 1.678. The salite has nX 1.68, suggesting about Ca60Mg40Fe10. Accessories include apatite, as pseudodichroic stubby prisms, and magnetite. Much hematitic dust is present in the groundmass, which consists principally of anhedral oligoclase (?), tridymite (?), magnetite, and needles of augite.46AC13Whole Rock 59.87 0.48 16.96 6.5 0.14 2.97 7.76 3.63 1.16 0.23 100.191085NN6.290.84H2OP=0.07; H2OM=0.19NNB V=0, M=SPEC, R=1085;Be V=0, M=SPEC, R=1085;Ba V=0.03, M=SPEC, R=1085;Sr V=0.07, M=SPEC, R=1085;La V=0, M=SPEC, R=1085;Zr V=0.004, M=SPEC, R=1085;Pb V=0, M=SPEC, R=1085;Cu V=0.002, M=SPEC, R=1085;Ni V=0.0009, M=SPEC, R=1085;Co V=0.001, M=SPEC, R=1085;Cr V=0.0008, M=SPEC, R=1085;V V=0.009, M=SPEC, R=1085;Ga V=0.0009, M=SPEC, R=1085;Mo V=0, M=SPEC, R=1085;Ag V=0, M=SPEC, R=1085;In V=0, M=SPEC, R=1085;Cd V=0, M=SPEC, R=1085;As V=0, M=SPEC, R=1085;Sb V=0, M=SPEC, R=1085;Sn V=0, M=SPEC, R=1085;Ge V=0, M=SPEC, R=1085;Tl V=0, M=SPEC, R=1085;

SAMPLE LOCATION

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