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SAMPLE INFO : 96-Mc-31B
Sample ID:96-Mc-31B
Station ID:96-Mc-31B
Latitude:54.0926
Longitude:-165.98938
Datum:NAD83
Date Sampled:1996-00-00
Sample Type 1:Lava
Sample Type 2:Flow
Field Lithology:Basalt
Final Unit:bef
Text Description:
Qfl - Flat Top lava flows. Thin (2 m) to medium (6 m) (at distal ends) lava flows exhibiting conspicuous reddish, oxidized scoriaceous tops and bottoms. Rocks are medium gray to medium dark gray porphyritic basalts (50.3 - 51.3% SiO2) containing phenocrysts of plagioclase (10-20%, 3 mm), olivine (2-6%, 1-2 mm), and clinopyroxene (trace=3%, 0.5-1 mm) in an intergranular groundmass. Whole rock 40Ar/39Ar mean age of basalt is 0.25 +/- 0.04 Ma. Unit as mapped may include flows from both present Akutan Volcano and ancestral Akutan.

References:
Geologic map of Akutan Island, Alaska
The eruptive history, magmatic evolution, and influence of glacial ice at long-lived Akutan volcano, eastern Aleutian Islands, 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
96-Mc-31B54.0926-165.98938McGimsey, R. G.1996-00-00 250000 ± 40000 40Ar/39Ar; 924; date of the unitAkutanlat/long estimated from paper mapQfl - Flat Top lava flows. Thin (2 m) to medium (6 m) (at distal ends) lava flows exhibiting conspicuous reddish, oxidized scoriaceous tops and bottoms. Rocks are medium gray to medium dark gray porphyritic basalts (50.3 - 51.3% SiO2) containing phenocrysts of plagioclase (10-20%, 3 mm), olivine (2-6%, 1-2 mm), and clinopyroxene (trace=3%, 0.5-1 mm) in an intergranular groundmass. Whole rock 40Ar/39Ar mean age of basalt is 0.25 +/- 0.04 Ma. Unit as mapped may include flows from both present Akutan Volcano and ancestral Akutan.96-Mc-31BLavabefWhole-rock 50.25 1.06 18.53 9.45 0.177 5.91 10.16 3.04 1.22 0.198 924XRF9.45 0.756199411 17.66250603 348.5036866 619.1186019 9.211931497 20.30240884 2.966168085 13.39574058 3.445041578 1.109758662 3.622222514 0.620354969 3.876631701 0.811081687 2.20300923 0.319707476 1.973623399 0.311843349 20.71420809 82.22400927 1.861854692 2.438304499 0.123643124 6.803549491 2.459584911 1.199898844 32.03106412 329 50 20 156 85 21 924ICPMS: Cs, Rb, Ba, Sr, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Y, Zr, Nb, Hf, Ta, Pb, Th, U, Sc; XRF: V, Cr, Ni, Cu, Zn, Ga;

SAMPLE LOCATION

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