AVO Logo
Site Map | FAQ |
Alaska Volcano Observatory
You are here: Home > Samples > 94SJP12

Sample ID:94SJP12
Station ID:94SJP12
Date Sampled:1994-00-00
Sample Type 1:Lava
Sample Type 2:Dike
Field Lithology:Dacite
Text Description:
Approximately 20 thick dike trending N33E that cuts through the brecciated unit (sBA9) at Site 12. Fine grained, vesicular, holocrystalline, seriate to glomeroporphyritic with a matrix of opaque, plagioclase, orthopyroxene, microlites, zircon? and minor alteration. Plagioclase phenocrysts (An26 - An62) are up to 2.3 mm and commonly are oscillatory zoned, some grains have sieve textured cores, and rounded rims or resorption embayments. Orthopyroxene phenocrysts are up to 0.75 mm and are strongly pleochroic with some opaque inclusions. Amphibole phenocrysts are up to 1.0 mm, display green-yellow pleochroism with rims dehydrated to small opaques; some opaque amphibole pseudomorphs. Opaque phenocrysts are up to 0.2 mm.

Geochemical variation in the less than 5 Ma Wrangell Volcanic Field, Alaska, with an emphasis on the Skookum Creek volcanic complex

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
94SJP1262.29-143.2665716Preece, S. J.1994-00-00 Skookum CreekNabesna B-5; T6N, R12E, S1994SJP12LavaWhole-rock 67.28 0.45 16.7 3.62 0.11 1.23 3.75 4.72 1.87 0.21 99.555DCP3.993.62LOI=0.04DCP 34 683 516 18 195 7 6.4 2.4 5.7 29bdl 4 15 56 16.3 55XRF: Rb, Zr, Nb, Th, U, Ni, Ga; DCP: Ba, Sc, V; MX: Sr, Y, Cu, Zn;


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 G22AC00137

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