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SAMPLE INFO : 87-ARh-26
Sample ID:87-ARh-26
Station ID:87-ARh-26
Latitude:62.0035
Longitude:-144.4536
Datum:NAD83
Date Sampled:1987-00-00
Sample Type 1:Lava
Field Lithology:Andesite
Text Description:
Unassigned rocks, andesite flows and dikes (Pleistocene). Flows, 5-15 m thick, are medium-gray, sparsely porphyritic andesite that contains about equal amounts (1-3%) of small (1 mm) phenocrysts of plagioclase, hypersthene, clinopyroxene, and possibly hornblende, in pilotaxitic groundmass. Some small areas of two-pyroxene andesite flows (Qwa) from the summit area of Wrangell may be locally present in this unit. All dark dikes south of Dadina River-Glacier system are included in unit; those that were examined are dark-gray, sparsely porphyritic hypersthene andesite and two-pyroxene andesite. Flows apparently erupted from fissures such as one filled by east-west-trending andesite dike (secs. 26 and 27, T. 3 N., R. 5 E.); earliest flows are interbedded with uppermost conglomerate beds of unit Qcg.

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-ARh-2662.0035-144.4536Richter, D. H.1987-00-00 Unassigned rock sample from within Gulkana A-1 quadrangle. Latitude and longitude derived from paper map.Unassigned rocks, andesite flows and dikes (Pleistocene). Flows, 5-15 m thick, are medium-gray, sparsely porphyritic andesite that contains about equal amounts (1-3%) of small (1 mm) phenocrysts of plagioclase, hypersthene, clinopyroxene, and possibly hornblende, in pilotaxitic groundmass. Some small areas of two-pyroxene andesite flows (Qwa) from the summit area of Wrangell may be locally present in this unit. All dark dikes south of Dadina River-Glacier system are included in unit; those that were examined are dark-gray, sparsely porphyritic hypersthene andesite and two-pyroxene andesite. Flows apparently erupted from fissures such as one filled by east-west-trending andesite dike (secs. 26 and 27, T. 3 N., R. 5 E.); earliest flows are interbedded with uppermost conglomerate beds of unit Qcg.87-ARh-26LavaWhole-rock 58 0.76 17.5 5.88 0.1 4.16 6.88 3.88 1.01 0.24 100.032262NN3.272.92H2OP=0.49; H2OM=1.13; CO2=0.03RAPIDA

SAMPLE LOCATION

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