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SAMPLE INFO : 91CND12
Sample ID:91CND12
Station ID:91CND12
Latitude:58.908
Longitude:-153.43754
Datum:NAD83
Date Sampled:1991-01-01
Sample Type 1:Lava
 Text Description:
Sample of block of dense glassy pyroclast. Similar blocks, radially fractured and up to ~80 cm, litter the surface of this ridge, rather than coming from a unit in section, and are thus presumably very young. Porphyritic two-pyroxene dacite with ~40% phenocrysts and glomerocrysts (individual pyroxene and plagioclase crystals typically 1.0 x 0.3 mm) in a groundmass of clear glass with only minor microlites. Conchoidal fractures in the glass suggest collapse of former vesicles. This is the only Douglas sample collected in 1991 with abundant glass.

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
91CND1258.908-153.43754Nye, C. J.1991-07-20 DouglasSample of block of dense glassy pyroclast. Similar blocks, radially fractured and up to ~80 cm, litter the surface of this ridge, rather than coming from a unit in section, and are thus presumably very young. Porphyritic two-pyroxene dacite with ~40% phenocrysts and glomerocrysts (individual pyroxene and plagioclase crystals typically 1.0 x 0.3 mm) in a groundmass of clear glass with only minor microlites. Conchoidal fractures in the glass suggest collapse of former vesicles. This is the only Douglas sample collected in 1991 with abundant glass.91CND12LavaWhole-rock 65.93 0.586 15.49 0.084 2.6 5.08 3.93 1.817 0.094 99.6413291XRF4.4 2.59097 54 504 217 0 34 3.26368 14.59486 3.95896 0.91065 4.42442 0.7834 5.02016 1.07997 3.00249 0.44467 2.86863 0.45908 32 151 2.5 3.99376 0.16784 4 3 2.07538 22 120 47 25 22 53 16 13291ICPMS: Cs, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Hf, Ta, U; XRF: Rb, Ba, Sr, Ce, Y, Zr, Nb, Pb, Th, Sc, V, Cr, Ni, Cu, Zn, Ga;

SAMPLE LOCATION

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