AVO Logo
Site Map | FAQ |
Alaska Volcano Observatory
You are here: Home > Samples > SG05-64
Sample info : SG05-64
Sample ID:SG05-64
Station ID:SG05-64
Latitude:56.591942147751
Longitude:-169.61298463549
Datum:NAD83
Date Sampled:0000-00-00
Sample Type 1:Lava
Text Description:
St. George Island, Group 3 type rocks (from Chang and others, 2009): "Most group 3 rocks are distinguished petrographically by their coarse-grained and plagioclase-rich nature. Group 3 rocks also contain abundant olivine phenocrysts and a few clinopyroxene and opaque phenocrysts. Olivine compositions for seven rocks range from Fo85 to Fo47 and average Fo75. Clinopyroxene phenocrysts have XMg compositions between 85 and 78, with an average of 81. Plagioclase compositions for five rocks range from An69 to An21 and average An59. Plagioclase commonly contains apatite inclusions and may exhibit deformation twinning. Although plagioclase grains were counted as phenocrysts based on their size, grains in several rocks have acicular habits, suggesting that they grew to a large size from relatively slow and prolonged cooling following eruption in the interiors of thick flows. Group 3 rocks sometimes exhibit a trachytic texture and have few, if any, vesicles."

References:
Petrogenesis of basaltic volcanic rocks from the Pribilof Islands, Alaska, by melting of metasomatically enriched depleted lithosphere, crystallization differentiation, and magma mixing

Geochem Data:
StationIDlatitudelongitudeGeologistDateVisitedVolcanoLocationDescriptionTextDescriptionSample IDSiO2TiO2Al2O3FeOTMnOMgOCaONa2OK2OP2O5Total-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
SG05-6456.591942147751-169.61298463549Unknown, Unknown0000-00-00St. George volcanic fieldGroup 3St. George Island, Group 3 type rocks (from Chang and others, 2009): "Most group 3 rocks are distinguished petrographically by their coarse-grained and plagioclase-rich nature. Group 3 rocks also contain abundant olivine phenocrysts and a few clinopyroxene and opaque phenocrysts. Olivine compositions for seven rocks range from Fo85 to Fo47 and average Fo75. Clinopyroxene phenocrysts have XMg compositions between 85 and 78, with an average of 81. Plagioclase compositions for five rocks range from An69 to An21 and average An59. Plagioclase commonly contains apatite inclusions and may exhibit deformation twinning. Although plagioclase grains were counted as phenocrysts based on their size, grains in several rocks have acicular habits, suggesting that they grew to a large size from relatively slow and prolonged cooling following eruption in the interiors of thick flows. Group 3 rocks sometimes exhibit a trachytic texture and have few, if any, vesicles."SG05-64 48.904990788085 2.6782678022492 16.91223766485 11.200413216917 0.17253495033743 5.2658423216581 8.693134631945 4.2208815329853 1.6472794825996 0.5468785534866 97.835254882XRF11.200413216917 19.3 258.8 632.9 25.7 51.8 25.8 197.2 37.1 3.8 3.2 20.4 228.4 30.2 18.1 113.4 4882XRF


Sample Location

URL: www.avo.alaska.edu/samples/sample_info.php
Page modified: April 22, 2014 13:36
Contact Information: AVO Web Team

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