AVO Logo
Site Map | FAQ |
Alaska Volcano Observatory
 
You are here: Home > Samples > 46AC21

SAMPLE INFO : 46AC21
Sample ID:46AC21
Station ID:46AC21
Latitude:51.9898
Longitude:-176.58705
Datum:NAD83
Date Sampled:1946-01-01
Sample Type 1:Lava
Sample Type 2:Dome
Field Lithology:Basalt
 Text Description:
Basalt. A light brownish-gray (5YR 5/1) rock, with seriate texture and numerous flattish, irregular vesicles. The larger plagioclase crystals, ranging in size from 4 to 0.1 mm, have a median composition of about An80. The dark-green salite has a maximum size of about 3 mm with a maximum index of 1.690, suggesting a composition near Ca50Mg30Fe20. Small amounts of "basaltic" hornblende, pleochroic in red-brown and yellow colors and with wide resorption borders of magnetite, are also present. The groundmass consists of plagioclase laths, rods of augite, granules of magnetite or ilmenite, and interstitial glass in small amount. Small prisms of apatite and irregular grains of magnetite or ilmenite are the principal accessory minerals.

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
46AC2151.9898-176.58705Unknown, Unknown1946-01-01 AdagdakFrom dome about 6,350 feet south 51 degrees east of summit of Mt. Adagdak.Basalt. A light brownish-gray (5YR 5/1) rock, with seriate texture and numerous flattish, irregular vesicles. The larger plagioclase crystals, ranging in size from 4 to 0.1 mm, have a median composition of about An80. The dark-green salite has a maximum size of about 3 mm with a maximum index of 1.690, suggesting a composition near Ca50Mg30Fe20. Small amounts of "basaltic" hornblende, pleochroic in red-brown and yellow colors and with wide resorption borders of magnetite, are also present. The groundmass consists of plagioclase laths, rods of augite, granules of magnetite or ilmenite, and interstitial glass in small amount. Small prisms of apatite and irregular grains of magnetite or ilmenite are the principal accessory minerals.46AC21LavaWhole-rock 53.27 0.56 19.14 8.28 0.18 3.68 10.07 3.37 0.93 0.31 100.221085NN8.180.87H2OP=0.1; H2OM=0.1NN units are percent 0.02units are percent 0.08units are percent 0 units are percent 0.004 units are percent 0 0.02units are percent 0.0004 0.001units are percent 0.008units are percent 0.004 units are percent 0.001units are percent 0units are percent 0 1085SPEC

SAMPLE LOCATION

Contact AVO Privacy Accessibility Information Quality FOIA
URL: www.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.