AVO Logo
Site Map | FAQ |
Alaska Volcano Observatory
You are here: Home > Samples > 93SJP12

Sample ID:93SJP12
Station ID:93SJP12
Date Sampled:1993-00-00
Sample Type 1:Lava
Sample Type 2:Dike
Field Lithology:Andesite
Text Description:
Approximately 5-10 thick bifurcating dike trending N85W and cutting silicic material from Dome C at Site 7 . Fine-grained, vesicular, hypocrystalline, intersertal, intergranular, porphyritic to glomeroporphyritic with a matrix of brown glass, plagioclase (An33 - An57), clinopyroxene and opaque. Many vesicles have dark brown, glassy rinds with plagioclase needles. A few vesicles are lined with yellowish alteration. Plagioclase phenocrysts (An30 - An54) have two populations: 3.7-0.2 mm and all large grains have sieve textured cores with thin overgrowth rims that are oscillatory zoned, and a few have poikilitic orthopyroxene; 0.2-0.05 mm, thin euhedral to subhedral laths, some with undulatory extinction. Orthopyroxene phenocrysts are 1.1-0.2 mm, and a few have thin clinopyroxene rims or sieve to spongy textured zones. Clinopyroxene phenocrysts are up to 1.05 mm and are frequently twinned; grains 0.1 - 0.05 mm in length are needle-like. Opaque phenocrysts are up to 0.08 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
93SJP1262.41518077-143.0818574Preece, S. J.1993-00-00 Skookum CreekNabesna B-5; T7N, R13E, S693SJP12LavaWhole-rock 57.38 1.19 17.34 6.71 0.13 3.8 7.05 4.3 1.09 0.29 100.4655DCP7.436.71LOI=0.68DCP 20.4 450 523 23 159 5.9 2.6 1.2 20.4 170 34 21 40 72 18.6 55XRF: Rb, Zr, Nb, Th, U, Ni, Ga; DCP: Ba, Sc, V; MX: Sr, Y, Cr, 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 G19AC00060 and G19AC00171.

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