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SAMPLE INFO : 96-Mc-32B
Sample ID:96-Mc-32B
Station ID:96-Mc-32
Latitude:54.1645
Longitude:-165.95658
Datum:NAD83
Date Sampled:1996-00-00
Sample Type 1:Lava
Sample Type 2:Flow
Field Lithology:Andesite
Final Unit:lea
Text Description:
Qol- pre-glacial lavas (Pleistocene). Lava flows are exposed locally, mostly around base of present Akutan cone; elsewhere covered by Holocene tephra (Qtu). Flows are typically thick (>5 m) and tend to form prominent cliffs. Rocks are medium gray, dark gray, and olive gray porphyritic andesites (56.5-59.8% SiO2, loc. 10 and 11, table 11) containing phenocrysts of plagioclase (5-30%, 4-5 mm), clinopyroxene (1-7%, 3 mm), orthopyroxene (trace-4%, 1-5 mm), and olivine (0-1%, 2 mm) in cryptocrystalline to pilotaxitic groundmasses. Whole rock 40Ar/39Ar mean age of andesite is 0.36 +/-0.05 Ma.

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-3254.1645-165.95658McGimsey, R. G.1996-00-00 360000 ± 50000 40Ar/39Ar; 924; date of the unitAkutanlat/long estimated from paper mapQol- pre-glacial lavas (Pleistocene). Lava flows are exposed locally, mostly around base of present Akutan cone; elsewhere covered by Holocene tephra (Qtu). Flows are typically thick (>5 m) and tend to form prominent cliffs. Rocks are medium gray, dark gray, and olive gray porphyritic andesites (56.5-59.8% SiO2, loc. 10 and 11, table 11) containing phenocrysts of plagioclase (5-30%, 4-5 mm), clinopyroxene (1-7%, 3 mm), orthopyroxene (trace-4%, 1-5 mm), and olivine (0-1%, 2 mm) in cryptocrystalline to pilotaxitic groundmasses. Whole rock 40Ar/39Ar mean age of andesite is 0.36 +/-0.05 Ma.96-Mc-32BLavaleaWhole-rock 59.86 0.798 17.51 6.83 0.172 2.55 6.17 4.5 1.32 0.289 924XRF6.83 0.531027754 24.28219572 443.4801597 418.2311578 11.5240823 28.26134511 4.253706036 19.94677067 5.593051651 1.592029448 6.050407965 1.039389539 6.450918461 1.402373069 3.968936382 0.575615437 3.800438653 0.614063523 37.37151488 147.1039888 3.0284458 4.416813921 0.233994581 6.401328151 2.773013514 1.395396338 16.41205126 112 8 1 43 76 19 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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