AVO Logo
Site Map | FAQ |
Alaska Volcano Observatory
 
You are here: Home > Samples > 54-Sn-284A

SAMPLE INFO : 54-Sn-284A
Sample ID:54-Sn-284A
Station ID:54-Sn-284A
Latitude:53.88707
Longitude:-166.93202
Datum:NAD83
Date Sampled:1954-01-01
Sample Type 1:Countryrock
Sample Type 2:Enclave/Inclusion
Field Lithology:Granitic
 Text Description:
Recrystallized wallrock, equivalent to syenodiorite in composition, from a beach boulder at the southeast end of the north arm of Skan Bay: it occurs as an inclusion in granite. The texture is hypidiomorphic-granular. Felsic minerals compose 76-80 percent of the rock: 2-3 percent quartz, 5-10 percent orthoclase partially altered to kaolin (1-2 percent), and 65-70 percent plagioclase partially altered to sericite (2-3 percent) and clinozoisite (0.1 percent). The plagioclase composition, by extinction angle, is An35 (mean of 10 crystals, standard deviation is 6 percent An, average amount of zoning per individual plagioclase crystal is 11 percent An per crystal). Mafic minerals compose 20-25 percent: 10-14 percent hornblende (much is interstitial), 5-10 percent biotite partially altered to epidote (0.1-0.5 percent) and penninite (0.1-1 percent), 1-3 percent magnetite, 0.1-1 percent sphene (associated with the magnetite) partially altered to leucoxene (0.1-0.5 percent), one large grain of tourmaline (about 0.3 percent), and <0.01 percent hematite.

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-284A53.88707-166.93202Snyder, G. L.1954-01-01 MakushinInclusion in granite from head of N arm of Skan BayRecrystallized wallrock, equivalent to syenodiorite in composition, from a beach boulder at the southeast end of the north arm of Skan Bay: it occurs as an inclusion in granite. The texture is hypidiomorphic-granular. Felsic minerals compose 76-80 percent of the rock: 2-3 percent quartz, 5-10 percent orthoclase partially altered to kaolin (1-2 percent), and 65-70 percent plagioclase partially altered to sericite (2-3 percent) and clinozoisite (0.1 percent). The plagioclase composition, by extinction angle, is An35 (mean of 10 crystals, standard deviation is 6 percent An, average amount of zoning per individual plagioclase crystal is 11 percent An per crystal). Mafic minerals compose 20-25 percent: 10-14 percent hornblende (much is interstitial), 5-10 percent biotite partially altered to epidote (0.1-0.5 percent) and penninite (0.1-1 percent), 1-3 percent magnetite, 0.1-1 percent sphene (associated with the magnetite) partially altered to leucoxene (0.1-0.5 percent), one large grain of tourmaline (about 0.3 percent), and <0.01 percent hematite.54-Sn-284ACountryrockEnclave/InclusionWhole-rock 55.8 1 16.8 6.9 0.12 4.3 7.1 4.6 1.6 0.21Total not given in table. 99.75315RAPIDA3.24H2OM=0.1; H2OP=1.1; CO2=0.05; Cl=0.12; F=0.1RAPIDA

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.