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SAMPLE INFO : 87-AWs-6
Sample ID:87-AWs-6
Station ID:87-AWs-6
Latitude:62.0479
Longitude:-144.3601
Datum:NAD83
Date Sampled:1987-00-00
Sample Type 1:Other
Sample Type 2:Plutonic
Field Lithology:Dacite
Text Description:
Unassigned rocks, older dacite intrusive rocks (Pleistocene). Light-olive-gray to greenish-gray, porphyritic dacitic intrusions and dikes that contain phenocrysts of plagioclase (5-20%, as large as 4 mm), hornblende (1-5%, as long as 2 mm; generally altered to carbonate, chlorite, and actinolite), fresh biotite (trace to 10%, as large as 5 mm), and traces of quartz and opaque minerals, in cryptocrystalline groundmass that is locally flooded by calcite. * * *K-Ar age on biotite from one sample is 1.35+/- 0.05 Ma.

References:
Geologic map of the Gulkana A-1 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
87-AWs-662.0479-144.3601Unknown, Unknown1987-00-00 Unassigned rock sample from within Gulkana A-1 quadrangle. Latitude and longitude derived from paper map.Unassigned rocks, older dacite intrusive rocks (Pleistocene). Light-olive-gray to greenish-gray, porphyritic dacitic intrusions and dikes that contain phenocrysts of plagioclase (5-20%, as large as 4 mm), hornblende (1-5%, as long as 2 mm; generally altered to carbonate, chlorite, and actinolite), fresh biotite (trace to 10%, as large as 5 mm), and traces of quartz and opaque minerals, in cryptocrystalline groundmass that is locally flooded by calcite. * * *K-Ar age on biotite from one sample is 1.35+/- 0.05 Ma.87-AWs-6OtherQuenched InclusionWhole-rock 65.1 0.43 16.3 4.19 0.06 2.15 4.85 3.91 1.78 0.17 99.672262NN1.72.67H2OP=0.4; H2OM=1.08; CO2=0.04RAPIDA

SAMPLE LOCATION

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