AVO Logo
Site Map | FAQ |
Alaska Volcano Observatory
You are here: Home > Samples > 94SJP11A

Sample ID:94SJP11A
Station ID:94SJP11A
Date Sampled:1994-00-00
Sample Type 1:Lava
Sample Type 2:Dike
Text Description:
A vertical dike trending S65E that intruded into the brecciated unit (sBA9) at Site 12. There is a 10 cm chill margin that is very glassy. Fine grained, vesicular, hypocrystalline, seriate porphyritic with a matrix of plagioclase, opaque, pale brown glass, microlites and orthopyroxene?. Plagioclase phenocrysts (An39 - An52) are up to 1.7 mm and both normal and oscillatory zoning are common; the largest grains often have thin overgrowth rims. Amphibole phenocrysts are up to 0.8 mm, and dehydrated to granular opaque masses with green-brown pleochroic cores; most grains are entirely replaced. Orthopyroxene phenocrysts are up to 0.25 mm. Opaque phenocrysts are up to 0.5 mm (primary not pseudomorphs after amphibole). 83.7% matrix, 10.1% plagioclase, 0.3% opaque, 0.1% altered phase, 0.1% alteration, 5.7% vesicles. Trachydacite.

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
94SJP11A62.28850246-143.267Preece, S. J.1994-00-00 Skookum CreekNabesna B-5; T6N, R12E, S1994SJP11ALavaWhole-rock 64.94 0.62 16.89 4.17 0.21 1.08 2.96 6.01 1.86 0.31 99.2755DCP4.584.17LOI=0.93DCP 19.8 594 433 46 458 17.8 5.6 0.8 6 2bdl 2 3 103 19.5 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.