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SAMPLE INFO : 94SJP94
Sample ID:94SJP94
Station ID:94SJP94
Latitude:62.35294651
Longitude:-143.4118559
Datum:NAD83
Date Sampled:1994-00-00
Sample Type 1:Lava
Sample Type 2:Flow
Field Lithology:Rhyolite
 Text Description:
Silicic flow, 75 - 100’ thick, forming the ridge top on the west side of Goat Creek. Upper red, slightly vesicular zone that is underlain by an upper vitrophyre. Middle is platy, but otherwise similar to the vitrophyre. There is a basal vitrophyre. Sample is from the upper vitrophyre. Fine grained, hypocrystalline, flow banded, porphyritic with a matrix of devitrified brown glass, cryptocrystalline material, opaque and plagioclase. Plagioclase phenocrysts are up to 2.05 mm and occasionally display oscillatory zoning or resorbed edges. Clinopyroxene phenocrysts are up to 0.5 mm. Orthopyroxene phenocrysts are up to 0.85 and some have opaque inclusions. Opaque phenocrysts are up to 0.2 mm. 95.9% matrix, 2.9% plagioclase, 0.7% orthopyroxene, 0.3% clinopyroxene, 0.2% opaque.

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

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
94SJP9462.35294651-143.4118559Preece, S. J.1994-00-00 Skookum CreekNabesna B-5; T7N, R11E, S29Silicic flow, 75 - 100’ thick, forming the ridge top on the west side of Goat Creek. Upper red, slightly vesicular zone that is underlain by an upper vitrophyre. Middle is platy, but otherwise similar to the vitrophyre. There is a basal vitrophyre. Sample is from the upper vitrophyre. Fine grained, hypocrystalline, flow banded, porphyritic with a matrix of devitrified brown glass, cryptocrystalline material, opaque and plagioclase. Plagioclase phenocrysts are up to 2.05 mm and occasionally display oscillatory zoning or resorbed edges. Clinopyroxene phenocrysts are up to 0.5 mm. Orthopyroxene phenocrysts are up to 0.85 and some have opaque inclusions. Opaque phenocrysts are up to 0.2 mm. 95.9% matrix, 2.9% plagioclase, 0.7% orthopyroxene, 0.3% clinopyroxene, 0.2% opaque.94SJP94LavaWhole-rock 69.6 0.56 14.85 3.49 0.09 0.51 1.71 5.06 3.88 0.12 100.2855DCP3.883.49LOI=0.15DCP 90 933 196 44 536 15.5 12.6 3.9 8.6 12bdl 1 15 71 17.8 55XRF: Rb, Zr, Nb, Th, U, Ni, Ga; DCP: Ba, Sc, V; MX: Sr, Y, Cu, Zn;

SAMPLE LOCATION

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