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SAMPLE INFO : 73-ARh-81
Sample ID:73-ARh-81
Station ID:73-ARh-81
Latitude:62.2853
Longitude:-143.93578
Datum:NAD83
Date Sampled:1973-00-00
Sample Type 1:Lava
Sample Type 2:Flow
Field Lithology:Basalt
Text Description:
Wrangell Lava. Olivine basalt and andesite flows (Pleistocene). Flows are 2-6 m thick and exhibit conspicuous reddish-brown scoriaceous flow tops and bottoms. Dense flow interiors are medium to dark gray and sparsely porphyritic containing phenocrysts of plagioclase (2-5%, 3-4 mm) and olivine (1-3%, 0.5 - 1 mm) in an intersertal to pilotaxitic groundmass of plagioclase, pyroxene, opaque minerals, and glass. Rarely, flows contains as much as 3% phenocrystic hypersthene. Flows probably erupted from a rift a few kilometers west in the Gulkana B-1 quadrangle and tend to be more silicic than some of the flows included in the map unit in Gulkana B-1 quadrangle (Richter and others, 1989). Major element chemistry for sample 73-ARh-81 (map locality 2) is shown in table 1. Whole rock K-Ar age of sample 73-ARh-87 (map locality 17) is 0.32 +/- 0.09 Ma. (table 2). Aggregate maximum thickness about 360 m.

References:
Geologic map of the Nabesna B-6 Quadrangle, south-central 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-8162.2853-143.93578Richter, D. H.1973-00-00 SanfordWrangell Lava; Nabesna B-6 quadrangle. Latitude and longitude derived from paper map.Wrangell Lava. Olivine basalt and andesite flows (Pleistocene). Flows are 2-6 m thick and exhibit conspicuous reddish-brown scoriaceous flow tops and bottoms. Dense flow interiors are medium to dark gray and sparsely porphyritic containing phenocrysts of plagioclase (2-5%, 3-4 mm) and olivine (1-3%, 0.5 - 1 mm) in an intersertal to pilotaxitic groundmass of plagioclase, pyroxene, opaque minerals, and glass. Rarely, flows contains as much as 3% phenocrystic hypersthene. Flows probably erupted from a rift a few kilometers west in the Gulkana B-1 quadrangle and tend to be more silicic than some of the flows included in the map unit in Gulkana B-1 quadrangle (Richter and others, 1989). Major element chemistry for sample 73-ARh-81 (map locality 2) is shown in table 1. Whole rock K-Ar age of sample 73-ARh-87 (map locality 17) is 0.32 +/- 0.09 Ma. (table 2). Aggregate maximum thickness about 360 m.73-ARh-81LavaWhole-rock 56.5 1.26 18.3 6.78 0.11 3.58 7.35 4.03 1.6 0.34 99.752321NN2.614.4H2OP=0.1; H2OM=0.05; CO2=0.01RAPIDA

SAMPLE LOCATION

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