AVO Logo
Site Map | FAQ |
Alaska Volcano Observatory
 
You are here: Home > Samples > 11b

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
StationIDLatitudeLongitudeGeologistDateVisitedVolcanoEruptionLocation 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
1157.0179-157.1864Unknown, UnknownYantarniSample 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)11bWhole Rock 55 0.93 17.4 7.83 0.14 4.5 9.13 2.46 1.29 0.15Total calculated from mixed methods 100.3199XRF3.654.54LOI=1.11XRF

SAMPLE LOCATION

Contact AVO Privacy Accessibility Information Quality FOIA
URL: www.avo.alaska.edu/samples/sample_info.php
Page modified: July 14, 2014 13:37
Contact Information: AVO Web Team

twitter @alaska_avo
facebook alaska.avo
email Receive volcano updates by email: USGS VNS