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SAMPLE INFO : 93SJP2
Sample ID:93SJP2
Station ID:93SJP2
Latitude:62.36656627
Longitude:-143.0554654
Datum:NAD83
Date Sampled:1993-00-00
Sample Type 1:Tephra Fall
Sample Type 2:Pumice
Field Lithology:Dacite
 Text Description:
Poorly exposed pumice bed at Site 9. Sample is approximately 6-8” in diameter. Fine-grained, hypocrystalline, porphyritic with a matrix of colorless glass, plagioclase, opaque and apatite?. Plagioclase phenocrysts (An27 - An55) are up to 1.4 mm and have strong oscillatory zoning and other complex zoning; some grains have resorption embayments. Orthopyroxene phenocrysts are up to 1.1 mm and have brown altered rims, and/or opaque inclusions. Clinopyroxene phenocrysts are up to 0.5 mm. Opaque phenocrysts are up to 0.3 mm. Amphibole phenocrysts are up to 0.1 mm. Dehydrated amphibole? (clinopyroxene, orthopyroxene, plagioclase) is represented by a clump of small crystals. 54.6% matrix, 17.1% plagioclase, 2.3% orthopyroxene, 0.5% opaque, 25.5% vesicles.

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
93SJP262.36656627-143.0554654Preece, S. J.1993-00-00 Skookum CreekNabesna B-5; T7N, R13E, S20Poorly exposed pumice bed at Site 9. Sample is approximately 6-8” in diameter. Fine-grained, hypocrystalline, porphyritic with a matrix of colorless glass, plagioclase, opaque and apatite?. Plagioclase phenocrysts (An27 - An55) are up to 1.4 mm and have strong oscillatory zoning and other complex zoning; some grains have resorption embayments. Orthopyroxene phenocrysts are up to 1.1 mm and have brown altered rims, and/or opaque inclusions. Clinopyroxene phenocrysts are up to 0.5 mm. Opaque phenocrysts are up to 0.3 mm. Amphibole phenocrysts are up to 0.1 mm. Dehydrated amphibole? (clinopyroxene, orthopyroxene, plagioclase) is represented by a clump of small crystals. 54.6% matrix, 17.1% plagioclase, 2.3% orthopyroxene, 0.5% opaque, 25.5% vesicles.93SJP2Tephra FallCumulateWhole-rock 66.2 0.54 16.1 3.31 0.07 1.5 3.87 4.12 2.39 0.14 99.3555DCP3.643.31LOI=1.83DCP 38 767 485 22.3 43.3 16.6 2.8 0.8 2.7 2.3 1.2 1.1 0.2 14 156 5.9 3.9 2.9 7.7 70 8 8 22 60 17.5 55XRF: Rb, Zr, Nb, Th, U, Ni, Ga; DCP: Ba, La, Ce, Nd, Sm, Eu, Gd, Dy, Er, Yb, Lu, Sc, V; MX: Sr, Y, Cr, Cu, Zn;

SAMPLE LOCATION

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