AVO Logo
Site Map | FAQ |
Alaska Volcano Observatory
 
You are here: Home > Samples > 79AYb 90

SAMPLE INFO : 79AYb 90
Sample ID:79AYb 90
Station ID:79AYb 90
Latitude:57.69093821611
Longitude:-156.83542235632
Datum:NAD83
Date Sampled:1979-01-01
Sample Type 1:Lava
Field Lithology:Dacite
 Text Description:
Light pinkish-gray (5 YR 8/1), vesicular hornblende plagioclase dacite (S; high-silica andesite G) porphyry. Extrusive, possibly a dome. Major phases are hornblende, plagioclase (An 54*), and glass. Poikilitic, brown to green pleochroic hornblende phenocrysts generally have sharp euhedral grain boundaries and no evidence of resorption. Plagioclase phenocrysts are unaltered, although grain boundaries are rounded and the phenocrysts have lines of inclusions in a thin zone parallel to the grain boundary, suggesting resorption and recrystallization. The plagioclase grains include weakly zoned and strongly oscillatory zoned grains that have an average composition of An 54 or greater. The very fine grained groundmass is primarily glass and devitrified glass and a small proportion of microcrystalline plagioclase and hornblende (?).

References:
Map and tables showing geochronology and whole-rock geochemistry of selected samples, Ugashik and part of Karluk quadrangles, 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
79AYb 9057.69093821611-156.83542235632Yount, M. E.1979-01-01 Blue MtnUgashik C-3, Blue MountainLight pinkish-gray (5 YR 8/1), vesicular hornblende plagioclase dacite (S; high-silica andesite G) porphyry. Extrusive, possibly a dome. Major phases are hornblende, plagioclase (An 54*), and glass. Poikilitic, brown to green pleochroic hornblende phenocrysts generally have sharp euhedral grain boundaries and no evidence of resorption. Plagioclase phenocrysts are unaltered, although grain boundaries are rounded and the phenocrysts have lines of inclusions in a thin zone parallel to the grain boundary, suggesting resorption and recrystallization. The plagioclase grains include weakly zoned and strongly oscillatory zoned grains that have an average composition of An 54 or greater. The very fine grained groundmass is primarily glass and devitrified glass and a small proportion of microcrystalline plagioclase and hornblende (?).79AYb 90LavaWhole-rock 64 0.46 16.4 4.39 0.14 1.88 4.96 3.58 2.14 0.16 99.684092XRF3.621.1CO2=0.16; H2OP=0.85; H2OM=0.4XRF

SAMPLE LOCATION

Contact AVO Privacy Accessibility Information Quality FOIA
URL: avo.alaska.edu/samples/sample_info.php
Page modified: August 1, 2017 15:29
Contact Information: AVO Web Team

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

This website is supported by the U.S. Geological Survey under Cooperative Agreement Grant G22AC00137

Mention of trade names or commercial products does not constitute their endorsement by the U.S. Geological Survey.