AVO Logo
Site Map | FAQ |
Alaska Volcano Observatory
 
You are here: Home > Samples > 46AC112

SAMPLE INFO : 46AC112
Sample ID:46AC112
Station ID:46AC112
Latitude:51.9242
Longitude:-177.1623
Datum:NAD83
Date Sampled:1946-01-01
Sample Type 1:Lava
Sample Type 2:Flow
Field Lithology:Andesite
Text Description:
Medium light-gray (N6) hypersthene andesite, conspicuously porphyritic and irregularly vesicular. Phenocrysts include plagioclase, augite, hypersthene, and hornblende. Plagioclase is labradorite with a median composition of An53, in crystals ranging in size from 0.1 to 2mm, commonly zoned, with the sequence of zones differing from one crystal to another. Salite, in dark-green crystals ranging in size from 0.1 to 0.5 mm, has nZ 1.712, suggesting a composition of Ca50Mg38Fe12. Hypersthene has nZ equal to 1.70, suggesting a composition of En72Fs28. Many of the hypersthene crystals have jackets of augite. The hornblende crystals are considerably resorbed, and are pleochroic from dark reddish-brown to yellow. The accessory minerals are magnetite or ilmenite, and psudodichroic apatite prisms. The groundmass consist of plagioclase crystals and augite needles in pale-brown glass whose index ranges from 1.50 to 1.495.

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
46AC11251.9242-177.1623Unknown, Unknown1946-01-01 KanagaLava flow, 8,400 feet sough 33.5 degrees east from the center of the crater of Kanaga volcano.Medium light-gray (N6) hypersthene andesite, conspicuously porphyritic and irregularly vesicular. Phenocrysts include plagioclase, augite, hypersthene, and hornblende. Plagioclase is labradorite with a median composition of An53, in crystals ranging in size from 0.1 to 2mm, commonly zoned, with the sequence of zones differing from one crystal to another. Salite, in dark-green crystals ranging in size from 0.1 to 0.5 mm, has nZ 1.712, suggesting a composition of Ca50Mg38Fe12. Hypersthene has nZ equal to 1.70, suggesting a composition of En72Fs28. Many of the hypersthene crystals have jackets of augite. The hornblende crystals are considerably resorbed, and are pleochroic from dark reddish-brown to yellow. The accessory minerals are magnetite or ilmenite, and psudodichroic apatite prisms. The groundmass consist of plagioclase crystals and augite needles in pale-brown glass whose index ranges from 1.50 to 1.495.46AC112LavaWhole-rock 56.83 0.64 18.1 7.44 0.18 3.04 7.81 3.62 1.64 0.46 100.661085NN4.153.73H2OP=0.2; H2OM=0.08NN

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 G19AC00060 and G19AC00171.

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