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SAMPLE INFO : 93SJP22
Sample ID:93SJP22
Station ID:93SJP22
Latitude:62.476018
Longitude:-143.0701955
Datum:NAD83
Date Sampled:1993-00-00
Sample Type 1:Lava
Field Lithology:Dacite
Text Description:
Float boulder of silicic material at Site 1 in the Boyden Hills. Fine-grained, vesicular, hypocrystalline, locally pilotaxitic, porphyritic to glomeroporphyritic with a matrix of cryptocrystalline material, opaque, feldspar, small amount of brown glass in glomeroporphyritic clot, and minor colorless glass patches. Plagioclase phenocrysts (An39 - An62) are up to 2.38 mm and both oscillatory and normal zoning are common; a few grains have resorption embayments that were later overgrown; there are occasional poikilitic orthopyroxene inclusions and some brown glass melt inclusions. Orthopyroxene phenocrysts are up to 1.3 mm, display intense pleochroism, large opaque inclusions, and some have brownish coating. Amphibole phenocrysts are up to 0.8 mm display red-brown or red-green pleochroism and have opaque coronas. Opaque phenocrysts are up to 0.48 mm.

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
93SJP2262.476018-143.0701955Preece, S. J.1993-00-00 Skookum CreekNabesna B-5; T8N, R13E, S18Float boulder of silicic material at Site 1 in the Boyden Hills. Fine-grained, vesicular, hypocrystalline, locally pilotaxitic, porphyritic to glomeroporphyritic with a matrix of cryptocrystalline material, opaque, feldspar, small amount of brown glass in glomeroporphyritic clot, and minor colorless glass patches. Plagioclase phenocrysts (An39 - An62) are up to 2.38 mm and both oscillatory and normal zoning are common; a few grains have resorption embayments that were later overgrown; there are occasional poikilitic orthopyroxene inclusions and some brown glass melt inclusions. Orthopyroxene phenocrysts are up to 1.3 mm, display intense pleochroism, large opaque inclusions, and some have brownish coating. Amphibole phenocrysts are up to 0.8 mm display red-brown or red-green pleochroism and have opaque coronas. Opaque phenocrysts are up to 0.48 mm.93SJP22LavaWhole-rock 65.73 0.6 16.72 3.8 0.09 1.34 3.8 4.56 2.35 0.22 99.6355DCP4.193.8LOI=0.77DCP 46 830 432 20 206 6.8 6.1 3.4 6.4 60 3 4 9 54 17.1 55XRF: Rb, Zr, Nb, Th, U, Ni, Ga; DCP: Ba, Sc, V; MX: Sr, Y, Cr, Cu, Zn;

SAMPLE LOCATION

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