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SAMPLE INFO : 94SJP39
Sample ID:94SJP39
Station ID:94SJP39
Latitude:62.427404
Longitude:-143.1238023
Datum:NAD83
Date Sampled:1994-00-00
Sample Type 1:Lava
Sample Type 2:Dike
Field Lithology:Dacite
Text Description:
Approximately 15-20’ thick dike that outcrops as rubbly plates and cuts up vertically through silicic material from Dome A as well as flows of unit nA1 at Site 3. Fine grained, holocrystalline, porphyritic with a matrix of cryptocrystalline material, opaque, plagioclase and minor alteration. Plagioclase phenocrysts (An28 - An47, An67) are up to 3.25 mm and are frequently rounded; some have oscillatory zoning; some have patchy, resorbed cores with complex overgrowth rims or resorption embayments. Amphibole phenocrysts are up to 0.5 mm with green-yellow pleochroism. Orthopyroxene phenocrysts are up to 0.5 mm with reddish oxidation? along rims. Opaque phenocrysts up to 0.35 mm. One clinopyroxene phenocrysts, 0.8 mm, was observed.

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
94SJP3962.427404-143.1238023Preece, S. J.1994-00-00 Skookum CreekNabesna B-5; T8N, R12E, S35Approximately 15-20’ thick dike that outcrops as rubbly plates and cuts up vertically through silicic material from Dome A as well as flows of unit nA1 at Site 3. Fine grained, holocrystalline, porphyritic with a matrix of cryptocrystalline material, opaque, plagioclase and minor alteration. Plagioclase phenocrysts (An28 - An47, An67) are up to 3.25 mm and are frequently rounded; some have oscillatory zoning; some have patchy, resorbed cores with complex overgrowth rims or resorption embayments. Amphibole phenocrysts are up to 0.5 mm with green-yellow pleochroism. Orthopyroxene phenocrysts are up to 0.5 mm with reddish oxidation? along rims. Opaque phenocrysts up to 0.35 mm. One clinopyroxene phenocrysts, 0.8 mm, was observed.94SJP39LavaWhole-rock 67.39 0.54 16.4 3.45 0.11 0.73 3.32 4.94 2.11 0.24 100.2955DCP3.833.45LOI=0.74DCP 39 727 390 21 229 7.5 5.6 1.4 8.3 83 2 5 13 63 17.5 55XRF: Rb, Zr, Nb, Th, U, Ni, Ga; DCP: Ba, Sc, V; MX: Sr, Y, Cr, Cu, Zn;

SAMPLE LOCATION

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