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SAMPLE INFO : 10AZnye03i
Sample ID:10AZnye03i
Station ID:10AZ-i3
Latitude:51.92876
Longitude:-176.55292
Datum:NAD83
Date Sampled:2010-01-01
Sample Type 1:Lava
Sample Type 2:Enclave/Inclusion
 Text Description:
This outcrop is a large lava mass consisting of host lava with abundant rounded magmatic inclusions several cm to 10s of cm across. Host is porphyritic pl-hb andesite w/ 15% pl (5-10mm) and 5% hb (1-3mm) in a fine-grained light greenish-grey gms. Inclusions are very fine-grained and equigranular with pl, px, hb in randomly oriented xl <<1mm (save a few percent mm-sized hb crystals). Northernmost of three domes shown by Coats (1956, USGS Bull 1028-C), who calls these, and two others near downtown Adak, Ta, Andesite porphyry domes. Coats notes these domes are glaciated (thus pre-late Pleistocene), but don't share the structural style of surrounding Finger Bay volcanics (thus not buried, much younger). Coats assigns an early Tertiary age (but he assigns late T to Moffett and Adagdak volcanoes; mid T to Andrew Bay volcano; and Paleozoic to Finger Bay volcs -- clearly too old. My guess would be early to mid Pleistocene for these domes.).

References:
Geochemistry of some Quaternary lavas from the Aleutian Arc and Mt. Wrangell

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
10AZ-i351.92876-176.55292Nye, C. J.2010-08-10 AZ stands for "Adak Zeto". Samples are from the northernmost of three domes along the eastern margin of a 1x2.5 km of slightly raised topography (which is connected by tombolos to Adagdak (north) and the main island (west) and forms the southeast margin of Clam Lagoon). Samples are from the prominent quarry on the west side of this dome adjacent to the road.This outcrop is a large lava mass consisting of host lava with abundant rounded magmatic inclusions several cm to 10s of cm across. Host is porphyritic pl-hb andesite w/ 15% pl (5-10mm) and 5% hb (1-3mm) in a fine-grained light greenish-grey gms. Inclusions are very fine-grained and equigranular with pl, px, hb in randomly oriented xl <<1mm (save a few percent mm-sized hb crystals). Northernmost of three domes shown by Coats (1956, USGS Bull 1028-C), who calls these, and two others near downtown Adak, Ta, Andesite porphyry domes. Coats notes these domes are glaciated (thus pre-late Pleistocene), but don't share the structural style of surrounding Finger Bay volcanics (thus not buried, much younger). Coats assigns an early Tertiary age (but he assigns late T to Moffett and Adagdak volcanoes; mid T to Andrew Bay volcano; and Paleozoic to Finger Bay volcs -- clearly too old. My guess would be early to mid Pleistocene for these domes.).10AZnye03iLavaWhole-rock 51.4 0.757 17.89 0.173 5.93 10.63 2.83 1.015 0.161 97.1113291XRF9.21 0.84493 21 345 687 6 16 2.50861 12 2.82064 0.95996 2.65509 0.4176 2.52699 0.52061 1.42411 0.20451 1.28179 0.20877 13 58 2.2 1.7127 0.08999 6 1 0.79743 33 294 94 27 83 74 19 13291ICPMS: Cs, Pr, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Hf, Ta, U; XRF: Rb, Ba, Sr, La, Ce, Nd, Y, Zr, Nb, Pb, Th, Sc, V, Cr, Ni, Cu, Zn, Ga;

SAMPLE LOCATION

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