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SAMPLE INFO : BCM-15
Sample ID:BCM-15
Station ID:BCM-15
Latitude:62.2977
Longitude:-143.61138
Datum:NAD83
Sample Type 1:Lava
Sample Type 2:Flow
Field Lithology:Andesite
Text Description:
Wrangell Lava. Tanada volcano. Intracaldera flows. Medium to thick (5-30 m), dark-gray to greenish-gray, porphyritic andesite flows. Chiefly augite-olivine andesites containing phenocrysts of plagioclase (5-20%, 1-10 mm), augite (trace to 3%, 1-2 mm), and olivine (trace to 2%, 3-5 mm) in a pilotaxitic to intergranular groundmass. Mafic minerals generally altered to clay minerals and serpentine; vesicles mostly filled with celadonite and calcite. Pyroclastic deposits, shown by dashed line labeled t, are chiefly bedded andesite lapilli airfall tuffs. An area of brecciation, hydrothermal alteration, and small dikes, shown by small triangles, occurs in the south-central part of the caldera and may mark the locus of long-lived post-caldera eruptive and thermal activity.

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
BCM-1562.2977-143.61138Unknown, Unknown Tanada PeakWrangell Lava; Nabesna B-6 quadrangle. Latitude and longitude derived from paper map.Wrangell Lava. Tanada volcano. Intracaldera flows. Medium to thick (5-30 m), dark-gray to greenish-gray, porphyritic andesite flows. Chiefly augite-olivine andesites containing phenocrysts of plagioclase (5-20%, 1-10 mm), augite (trace to 3%, 1-2 mm), and olivine (trace to 2%, 3-5 mm) in a pilotaxitic to intergranular groundmass. Mafic minerals generally altered to clay minerals and serpentine; vesicles mostly filled with celadonite and calcite. Pyroclastic deposits, shown by dashed line labeled t, are chiefly bedded andesite lapilli airfall tuffs. An area of brecciation, hydrothermal alteration, and small dikes, shown by small triangles, occurs in the south-central part of the caldera and may mark the locus of long-lived post-caldera eruptive and thermal activity. BCM-15LavaWhole-rock 55.9 1.05 18 6.41 0.13 4.16 7.7 3.74 1.26 0.32 99.532321NN3.083.59H2OP=0.5; H2OM=0.73; CO2=0.01RAPIDA

SAMPLE LOCATION

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