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SAMPLE INFO : 10AZnye01h
Sample ID:10AZnye01h
Station ID:10AZ01
Latitude:51.928761
Longitude:-176.552933
Datum:NAD83
Sample Type 1:Lava
Sample Type 2:Dome
Text Description:
This outcrop is a large lava mass consisting of host lava with abundant rounded magmatic inclusions several cn to 10s of cm across. Host is porphyritic pl-hb andesite w/ 15% pl (5-10mm) and 5% hb (1-3mm) in a finegrained 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). Northermost 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 Moffet and Adagdak volcanoes; mid T to Andrew Bay volcano; and Paleozoic to FBvolcs -- clearly too old. My guess would be early to mid Pleisotcene 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
10AZ0151.928761-176.552933Nye, 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 cn to 10s of cm across. Host is porphyritic pl-hb andesite w/ 15% pl (5-10mm) and 5% hb (1-3mm) in a finegrained 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). Northermost 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 Moffet and Adagdak volcanoes; mid T to Andrew Bay volcano; and Paleozoic to FBvolcs -- clearly too old. My guess would be early to mid Pleisotcene for these domes.).10AZnye01hLavaWhole-rock 60.62 0.528 16.79 0.11 3.72 7.71 3.25 1.299 0.119 97.0213291XRF5.84 1.12225 30 629 611 11 23 3.07842 12 2.71252 0.87902 2.41343 0.36954 2.27567 0.46002 1.26171 0.18792 1.21498 0.19745 12 77 2.3 2.15378 0.14997 9 3 1.68072 20 181 60 18 40 54 17 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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