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SAMPLE INFO : 73-ARh-111
Sample ID:73-ARh-111
Station ID:73-ARh-111
Latitude:62.0368
Longitude:-143.0479
Datum:NAD83
Date Sampled:1973-00-00
Sample Type 1:Lava
Field Lithology:Rhyolite
Text Description:
Rhyolite flows and domes. Extensive thick flows and probably domes of gray to pinkish gray devitrified rhyolite with black porphyritic glassy base. Devitrified rocks contain sparse phenocrysts of biotite and plagioclase in an extremely fine-grained felty matrix. Glassy base contains abundant plagioclase and sparse hypersthene in a perlitic glassy matrix. K-Ar date (M.A. Lanphere, written commun., 1974 unpub. data) on plagioclase indicates age of 2.85 +/- 0.05 m.y. (Sample 73-ARh-111).

References:
Geologic map of the Nabesna A-5 quadrangle, Alaska

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
73-ARh-11162.0368-143.0479Richter, D. H.1973-00-00 2850000 ± 200000 K-Ar; 4537; plagioclase K-ArNabesna A-5 quadrangle; Wrangell Lava; Wrangell Volcanic Field. lat long points derived from paper map. Sample from Ice Fields Plateau and associated eruptive centers.Rhyolite flows and domes. Extensive thick flows and probably domes of gray to pinkish gray devitrified rhyolite with black porphyritic glassy base. Devitrified rocks contain sparse phenocrysts of biotite and plagioclase in an extremely fine-grained felty matrix. Glassy base contains abundant plagioclase and sparse hypersthene in a perlitic glassy matrix. K-Ar date (M.A. Lanphere, written commun., 1974 unpub. data) on plagioclase indicates age of 2.85 +/- 0.05 m.y. (Sample 73-ARh-111).73-ARh-111LavaWhole-rock 70.6 0.39 14.5 1.99 0.06 0.54 1.7 4.3 3.3 0.08 99.984537RAPIDA0.881.2H2O=2.53RAPIDA

SAMPLE LOCATION

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