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SAMPLE INFO : 87-ADB-2
Sample ID:87-ADB-2
Station ID:87-ADB-2
Latitude:62.1642
Longitude:-144.3789
Datum:NAD83
Date Sampled:1987-00-00
Sample Type 1:Lava
Sample Unit:Qna
Text Description:
Nathlie Mountain olivine basaltic andesite flows and fragmental rocks (Pleistocene). Upper part consists of sequence of agglomerate, lapilli tuff, hyaloclastite, pillow breccia, and both pillowed and nonpillowed lava flows. Both tuff and matrix of fragmental rocks are generally palagonitized. Lower part consists chiefly of sequence of medium-thickness to thick (10-90 m), dark-gray to greenish-black flows that locally exhibit highly developed columnar joints. Single flow of hornblende dacite is present low in section. Lavas from both upper and lower parts of unit are chiefly aphyric to strikingly porphyritic olivine basaltic andesite. * * * Source of dacite flow is apparently local; olivine basaltic andesite lavas may all have originated at Mount Sanford.

References:
Geologic map of the Gulkana A-1 Quadrangle, south-central Alaska

GEOCHEM DATA
StationIDLatitudeLongitudeGeologistDateVisitedVolcanoEruptionLocation DescriptionText DescriptionSample IDMaterialSiO2TiO2Al2O3FeOTMnOMgOCaONa2OK2OP2O5Total-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-ADB-262.1642-144.3789Unknown, Unknown1987-00-00SanfordMount Sanford (?) rocks on Nathlie Mountain within Gulkana A-1 quadrangle. Latitude and longitude derived from paper map.Nathlie Mountain olivine basaltic andesite flows and fragmental rocks (Pleistocene). Upper part consists of sequence of agglomerate, lapilli tuff, hyaloclastite, pillow breccia, and both pillowed and nonpillowed lava flows. Both tuff and matrix of fragmental rocks are generally palagonitized. Lower part consists chiefly of sequence of medium-thickness to thick (10-90 m), dark-gray to greenish-black flows that locally exhibit highly developed columnar joints. Single flow of hornblende dacite is present low in section. Lavas from both upper and lower parts of unit are chiefly aphyric to strikingly porphyritic olivine basaltic andesite. * * * Source of dacite flow is apparently local; olivine basaltic andesite lavas may all have originated at Mount Sanford.87-ADB-2Whole Rock 55.1 1.11 16.2 7.42 0.13 7.11 7.92 3.41 1.03 0.28 100.272262NN1.975.66H2OP=0.08; H2OM=0.15; CO2=0.11RAPIDA

SAMPLE LOCATION

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