AVO Logo
Site Map | FAQ |
Alaska Volcano Observatory
 
You are here: Home > Samples > 54-Sn-197

SAMPLE INFO : 54-Sn-197
Sample ID:54-Sn-197
Station ID:54-Sn-197
Latitude:53.88707
Longitude:-166.93202
Datum:NAD83
Date Sampled:1954-01-01
Sample Type 1:Countryrock
Sample Type 2:Plutonic
Text Description:
Granodiorite from north of the 3600 Mountain roof pendant, midway between Skan Ray and Naginak Cove. The texture is hypidiomorphic-granular. Felsic minerals compose 80-85 percent of the rock: 15-20 percent quartz, 10-15 percent orthoclase slightly altered to kaolin (<1 percent), and 50-55 percent plagioclase partially altered to sericite (1-2 percent). The plagioclase composition, by extinction angle, is An39 [mean of 40 crystals, standard deviation is 13 percent An, average amount of zoning per individual plagioclase crystal is 8 percent An per crystal], by index oils, is An40. Mafic minerals compose 15-20 percent: 5-8 percent actinolitic hornblende as long as 10 mm, 8-12 percent biotite up to 7 mm in diameter and partially altered to penninite (1-2 percent) and sphene (<1 percent, itself slightly altered to leucoxene <0.01 percent), 1-2 percent magnetite, and <0.01 percent apatite (in plagioclase) .

References:
Geology of Unalaska Island and adjacent insular shelf, 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
54-Sn-19753.88707-166.93202Snyder, G. L.1954-01-01 MakushinGranodiorite and related rocks from head of N arm of Skan Bay. North of the 3600 Mountain roof pendant, midway between Skan Ray and Naginak Cove.Granodiorite from north of the 3600 Mountain roof pendant, midway between Skan Ray and Naginak Cove. The texture is hypidiomorphic-granular. Felsic minerals compose 80-85 percent of the rock: 15-20 percent quartz, 10-15 percent orthoclase slightly altered to kaolin (<1 percent), and 50-55 percent plagioclase partially altered to sericite (1-2 percent). The plagioclase composition, by extinction angle, is An39 [mean of 40 crystals, standard deviation is 13 percent An, average amount of zoning per individual plagioclase crystal is 8 percent An per crystal], by index oils, is An40. Mafic minerals compose 15-20 percent: 5-8 percent actinolitic hornblende as long as 10 mm, 8-12 percent biotite up to 7 mm in diameter and partially altered to penninite (1-2 percent) and sphene (<1 percent, itself slightly altered to leucoxene <0.01 percent), 1-2 percent magnetite, and <0.01 percent apatite (in plagioclase) .54-Sn-197CountryrockEnclave/InclusionWhole-rock 66.6 0.45 16.11 3.29 0.07 1.63 4.01 3.75 3.1 0.21 100.1315NN1.322.1H2OM=0.05; H2OP=0.56; CO2=0.01; Cl=0.03; F=0.05NN units are percent 0.08units are percent 0.07 units are percent 0.0001 units are percent 0.003units are percent 0.002 units are percent 0 units are percent 0.0008 0.009units are percent 0.001 0.0009units are percent 0.0006units are percent 0.002 units are percent 0.001units are percent 0 315NN

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.