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SAMPLE INFO : 87-WAD-4
Sample ID:87-WAD-4
Station ID:87-WAD-4
Latitude:62.142
Longitude:-144.378
Datum:NAD83
Date Sampled:1987-00-00
Sample Type 1:Other
Sample Type 2:Plutonic
Field Lithology:Dacite
Text Description:
Nathlie Mountain hornblende dacite intrusion (Pleistocene). Yellowish-gray, massive, porphyritic dacite (fig 4) that locally displays well-developed columnar joints. Phenocrysts consist of strongly zoned (An15-55) plagioclase (7-15%, as large as 4 mm) highly altered hornblende (1-4%, as long as 3 mm), hypersthene (trace to 1%, 0.5 mm), and rare quartz in cavities, in microfelty groundmass of plagioclase and mafic, opaque, and alteration minerals.

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-WAD-462.142-144.378Duffield, W. A.1987-00-00 Nathlie Mountain rocks within Gulkana A-1 quadrangle. Latitude and longitude derived from paper map.Nathlie Mountain hornblende dacite intrusion (Pleistocene). Yellowish-gray, massive, porphyritic dacite (fig 4) that locally displays well-developed columnar joints. Phenocrysts consist of strongly zoned (An15-55) plagioclase (7-15%, as large as 4 mm) highly altered hornblende (1-4%, as long as 3 mm), hypersthene (trace to 1%, 0.5 mm), and rare quartz in cavities, in microfelty groundmass of plagioclase and mafic, opaque, and alteration minerals. 87-WAD-4OtherQuenched InclusionWhole-rock 64.5 0.55 16.3 3.97 0.07 2.4 5.11 3.8 1.8 0.16 99.872262NN3.470.83H2OP=0.44; H2OM=0.83; CO2=0.06RAPIDA

SAMPLE LOCATION

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