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SAMPLE INFO : 93SJP21
Sample ID:93SJP21
Station ID:93SJP21
Latitude:62.4751846
Longitude:-143.0665843
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, holocrystalline, porphyritic to glomeroporphyritic with a matrix of cryptocrystalline material, opaque, feldspar and microlites. Cognate inclusions of equigranular masses of plagioclase, opaque, orthopyroxene and biotite are present. There is no melt reaction between the inclusion and the host. Plagioclase phenocrysts (An43 - An53) are up to 2.2 mm and both oscillatory and normal zoning are common. Orthopyroxene phenocrysts are up to 2.75 mm, with intense pleochroism (birefringence at maximum for orthopyroxene) and large opaque inclusions. Dehydrated amphibole is present as opaque aggregates. Opaque phenocrysts up to 1.55 mm (does not appear to be aggregate). Biotite phenocrysts are up to 0.2 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
93SJP2162.4751846-143.0665843Preece, 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, holocrystalline, porphyritic to glomeroporphyritic with a matrix of cryptocrystalline material, opaque, feldspar and microlites. Cognate inclusions of equigranular masses of plagioclase, opaque, orthopyroxene and biotite are present. There is no melt reaction between the inclusion and the host. Plagioclase phenocrysts (An43 - An53) are up to 2.2 mm and both oscillatory and normal zoning are common. Orthopyroxene phenocrysts are up to 2.75 mm, with intense pleochroism (birefringence at maximum for orthopyroxene) and large opaque inclusions. Dehydrated amphibole is present as opaque aggregates. Opaque phenocrysts up to 1.55 mm (does not appear to be aggregate). Biotite phenocrysts are up to 0.2 mm.93SJP21LavaWhole-rock 67.3 0.56 16.61 3.56 0.08 0.8 3.56 4.85 2.28 0.15 99.1755DCP3.913.56LOI=0.23DCP 46 869 405 18 199 6 5.3 2.6 5.7 39 1 6 8 52 16.3 55XRF: Rb, Zr, Nb, Th, U, Ni, Ga; DCP: Ba, Sc, V; MX: Sr, Y, Cr, Cu, Zn;

SAMPLE LOCATION

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