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SAMPLE INFO : 46AC175
Sample ID:46AC175
Station ID:46AC175
Latitude:51.9898
Longitude:-176.58705
Datum:NAD83
Date Sampled:1946-01-01
Sample Type 1:Lava
Sample Type 2:Dome
Field Lithology:Andesite
 Text Description:
Hornblende andesite. A compact, light pinkish-gray (5R 7/1) rock, with conspicuous crystals of white plagioclase and black hornblende, and a seriate texture. The median composition of the larger plagioclase crystals is about An[?]; the maximum size is about 2 mm. The hornblende forms brilliant narrow prisms, as much as 1.5 mm long, greenish-brown in thin section, and showing marginal resorption to clinopyroxene. The larger salite crystals have nZ 1.715 plus/minus 0.005, or about Ca50Mg35Fe15. The groundmass, with a mean grain size of about 0.002 mm, is apparently an intergrowth of quartz and orthoclase, with prisms up to 0.008 mm long of pyroxene and grains or iron ore about 0.003 mm across. Cristobalite lines vesicles and fills obscure cracks and replaces some of the groundmass.

References:
Magmatic differentiation in Tertiary and Quaternary volcanic rocks from Adak and Kanaga Islands, 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
46AC17551.9898-176.58705Unknown, Unknown1946-01-01 AdagdakFrom summit dome of Mt. Adagdak, at a point 800 feet north 78 degrees east of summit.Hornblende andesite. A compact, light pinkish-gray (5R 7/1) rock, with conspicuous crystals of white plagioclase and black hornblende, and a seriate texture. The median composition of the larger plagioclase crystals is about An[?]; the maximum size is about 2 mm. The hornblende forms brilliant narrow prisms, as much as 1.5 mm long, greenish-brown in thin section, and showing marginal resorption to clinopyroxene. The larger salite crystals have nZ 1.715 plus/minus 0.005, or about Ca50Mg35Fe15. The groundmass, with a mean grain size of about 0.002 mm, is apparently an intergrowth of quartz and orthoclase, with prisms up to 0.008 mm long of pyroxene and grains or iron ore about 0.003 mm across. Cristobalite lines vesicles and fills obscure cracks and replaces some of the groundmass.46AC175LavaWhole-rock 61.34 0.38 17.32 5.98 0.16 2.16 6.72 3.87 1.53 0.32 100.561085NN3.722.64H2OP=0.19; H2OM=0.04NN units are percent 0.03units are percent 0.08units are percent 0 units are percent 0.005 units are percent 0 0.01units are percent 0.0004 0.001units are percent 0.0008units are percent 0.001 units are percent 0.0007units are percent 0units are percent 0 1085SPEC

SAMPLE LOCATION

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