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SAMPLE INFO : 93SJP20
Sample ID:93SJP20
Station ID:93SJP20
Latitude:62.47407338
Longitude:-143.0635288
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, holocrystalline, porphyritic to glomeroporphyritic with a matrix of cryptocrystalline material, opaque and feldspar. Plagioclase phenocrysts (An55) are up to 1.88 mm and oscillatory zoning is common with less abundant normal zoning, grains occasionally have orthopyroxene or opaque inclusions. Orthopyroxene phenocrysts are up to 0.7 mm with intense pleochroism (birefringence is maximum for orthopyroxene), and frequently opaque inclusions are present. Amphibole phenocrysts are up to 1.3 mm with red-brown pleochroism and some have black coronas; occasionally grains have opaque inclusions; and some opaque aggregates may be dehydrated amphibole. Opaque phenocrysts are up to 0.3 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
93SJP2062.47407338-143.0635288Preece, 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, holocrystalline, porphyritic to glomeroporphyritic with a matrix of cryptocrystalline material, opaque and feldspar. Plagioclase phenocrysts (An55) are up to 1.88 mm and oscillatory zoning is common with less abundant normal zoning, grains occasionally have orthopyroxene or opaque inclusions. Orthopyroxene phenocrysts are up to 0.7 mm with intense pleochroism (birefringence is maximum for orthopyroxene), and frequently opaque inclusions are present. Amphibole phenocrysts are up to 1.3 mm with red-brown pleochroism and some have black coronas; occasionally grains have opaque inclusions; and some opaque aggregates may be dehydrated amphibole. Opaque phenocrysts are up to 0.3 mm.93SJP20LavaWhole-rock 66.63 0.54 16.22 3.46 0.09 1.2 3.47 4.5 2.53 0.2 99.8355DCP3.823.46LOI=1.12DCP 47 858 402 18 207 6.7 6.2 2.8 6 47 14 3 5 55 16 55XRF: Rb, Zr, Nb, Th, U, Ni, Ga; DCP: Ba, Sc, V; MX: Sr, Y, Cr, Cu, Zn;

SAMPLE LOCATION

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