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SAMPLE INFO : 73ARh31
Sample ID:73ARh31
Station ID:73ARh31
Latitude:62.116
Longitude:-144.55858
Datum:NAD83
Date Sampled:1973-00-00
Sample Type 1:Lava
Sample Type 2:Dome
Field Lithology:Rhyolite
Text Description:
Rhyolite Domes. Four conspicuously light-colored rhyolite domes (A, B, C, D) along southeast flank of Mount Drum, roughly coincident with arc of biotite-hornblende dacite domes (Qldd), appear to represent climax of activity of first cycle of Mount Drum volcanism. Domes are all deeply dissected by erosion and, with exception of dome D, expose light-colored cores cut by numerous dark-colored dacite dikes (Qdd). Rocks are light gray, pink, and buff, and weakly porphyritic with small (2 mm) phenocrysts of relatively abundant plagioclase, common to rare biotite that is generally oxidized, and very rare hornblende and resorbed quartz in a felsitic vapor-phase crystallized or spherulitic groundmass that is locally pilotaxitic.

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
73ARh3162.116-144.55858Richter, D. H.1973-00-00 DrumWrangell Lava, Mount Drum, AlaskaRhyolite Domes. Four conspicuously light-colored rhyolite domes (A, B, C, D) along southeast flank of Mount Drum, roughly coincident with arc of biotite-hornblende dacite domes (Qldd), appear to represent climax of activity of first cycle of Mount Drum volcanism. Domes are all deeply dissected by erosion and, with exception of dome D, expose light-colored cores cut by numerous dark-colored dacite dikes (Qdd). Rocks are light gray, pink, and buff, and weakly porphyritic with small (2 mm) phenocrysts of relatively abundant plagioclase, common to rare biotite that is generally oxidized, and very rare hornblende and resorbed quartz in a felsitic vapor-phase crystallized or spherulitic groundmass that is locally pilotaxitic.73ARh31LavaWhole-rock 74.86 0.09 14.45 0.89 0.07 0.29 1.58 4.53 2.84 0.01 99.155DCP0.980.89LOI=0.39DCP 921 346 8 48 2.2 5 1 3 3 39 55DCP: Ba, Sc, V; MX: Sr, Y, Cr, Cu, Zn; XRF: Zr, Ni;

SAMPLE LOCATION

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