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SAMPLE INFO : 71-PCL-198
Sample ID:71-PCL-198
Station ID:71-PCL-198
Latitude:62.4217
Longitude:-143.15178
Datum:NAD83
Date Sampled:1971-00-00
Sample Type 1:Lava
Field Lithology:Andesite
 Text Description:
Wrangell Lava. Andesite flows, flow breccias, and volcaniclastic rocks, undifferentiated. Light to dark-gray hypersthene andesite flows, commonly showing red scoriaceous tops and bottoms. The rocks are holocrystalline, often with labradorite phenocrysts in a trachyitc groundmass of plagioclase, minor clinopyroxene, and traces of olivine. Flows are often highly vesicular and locally amygdaloidal, with chalcedony the most common vesicle filling. Although individual flows are rarely over 5 m in thickness, the entire unit may exceed 1000 m in places. Massive lenses of andesite breccia, up to several hundred meters thick, including some vent debris and thinner lenses of volcaniclastic sand, gravel, and boulder deposits, as much as several meters thick, occur scattered through the unit. A sample of a flow from high in the section at the extreme northern extent of unit (sec. 17, T. 8 N., R. 13 E.) yielded a K-Ar (whole rock) age of 2.77 +/- 0.10 m.y. (M. Lanphere, written commun., 1977). Similar rocks from the adjacent Nabesna C-5 quadrangle yielded an age of 1.97 +/- 0.15 m.y. (Richter and Schmoll, 1973).

References:
Geologic map of the Nabesna B-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
71-PCL-19862.4217-143.15178Lowe, P. C.1971-00-00 Nabesna B-5 Quadrangle; latitude and longitude derived from paper map. Wrangell Lava. Andesite flows, flow breccias, and volcaniclastic rocks, undifferentiated. Light to dark-gray hypersthene andesite flows, commonly showing red scoriaceous tops and bottoms. The rocks are holocrystalline, often with labradorite phenocrysts in a trachyitc groundmass of plagioclase, minor clinopyroxene, and traces of olivine. Flows are often highly vesicular and locally amygdaloidal, with chalcedony the most common vesicle filling. Although individual flows are rarely over 5 m in thickness, the entire unit may exceed 1000 m in places. Massive lenses of andesite breccia, up to several hundred meters thick, including some vent debris and thinner lenses of volcaniclastic sand, gravel, and boulder deposits, as much as several meters thick, occur scattered through the unit. A sample of a flow from high in the section at the extreme northern extent of unit (sec. 17, T. 8 N., R. 13 E.) yielded a K-Ar (whole rock) age of 2.77 +/- 0.10 m.y. (M. Lanphere, written commun., 1977). Similar rocks from the adjacent Nabesna C-5 quadrangle yielded an age of 1.97 +/- 0.15 m.y. (Richter and Schmoll, 1973).71-PCL-198LavaWhole-rock 56.5 0.85 17.5 5.8 0.12 4.9 7.3 3.3 0.95 0.2 1004540RAPIDA2.53.6H2OP=2.3; H2OM=0.29; CO2=0.05RAPIDA

SAMPLE LOCATION

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