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SAMPLE INFO : 11b
Sample ID:11b
Station ID:11
Latitude:57.0179
Longitude:-157.1864
Datum:NAD83
Sample Type 1:Pyroclastic Flow
Sample Type 2:Juvenile
Field Lithology:Basaltic Andesite
Text Description:
Sample of pyroclastic flow deposit that has 50% or more ash matrix, and on the basis of its granulometry is classified as an ash-flow tuff. Sample is representative only of the fine-grained matrix. Vesicular, porphyritic basaltic andesite with subhedral to euhedral phenocrysts of plagioclase, clino- and orthopyroxene, and hornblende in a fine-grained, holocrystalline groundmass. Hornblende also occurs in the groundmass and shows minor reaction rims of clinopyroxene but no opaque rims. (Texture: Vesicular vitrophyre; groundmass 0.2-0.4 mm, plagioclase > clinopyroxene = hornblende > opaque (orthopyroxene?); hornblende rimmed by clinopyroxene and plagioclase; rare glass. Alteration: None)

References:
Petrography, chemistry, and geologic history of Yantarni volcano, Aleutian volcanic arc, Alaska

GEOCHEM DATA
StationIDLatitudeLongitudeGeologistDateVisitedVolcanoLocation DescriptionText DescriptionSample IDSiO2TiO2Al2O3FeOTMnOMgOCaONa2OK2OP2O5Total-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
11 57.0179 -157.1864 Unknown, Unknown YantarniSample of pyroclastic flow deposit that has 50% or more ash matrix, and on the basis of its granulometry is classified as an ash-flow tuff. Sample is representative only of the fine-grained matrix. Vesicular, porphyritic basaltic andesite with subhedral to euhedral phenocrysts of plagioclase, clino- and orthopyroxene, and hornblende in a fine-grained, holocrystalline groundmass. Hornblende also occurs in the groundmass and shows minor reaction rims of clinopyroxene but no opaque rims. (Texture: Vesicular vitrophyre; groundmass 0.2-0.4 mm, plagioclase > clinopyroxene = hornblende > opaque (orthopyroxene?); hornblende rimmed by clinopyroxene and plagioclase; rare glass. Alteration: None)11b 55.03617527801 0.93061169106454 17.411444542498 7.8294162753178 0.14009208252584 4.5029597954736 9.1259985188264 2.4616180215255 1.2908484747024 0.15009865984912Total calculated from mixed methods 100.3199XRF3.654.54LOI=1.11XRF

SAMPLE LOCATION

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Page modified: July 14, 2014 13:37
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