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SAMPLE INFO : 91CNI07
Sample ID:91CNI07
Station ID:91CNI07
Latitude:60.01098
Longitude:-152.99019
Datum:NAD83
Date Sampled:1991-01-01
Sample Type 1:Lava
Text Description:
Porphyritic two-pyroxene low-silica andesite. Phenocrysts of plagioclase (35%, up to 1.7 mm), clinopyroxene (20%, typically 0.5 mm diameter stubby prisms), and orthopyroxene (5%). Groundmass consists of abundant microlites (typically < 20 microns) with subordinate deep reddish-brown glass. Most plagioclase phenocrysts are extensively sieved. 91CNI01, 07, and 12 are petrographically similar to each other, and different from typical Iliamna lavas in this suite in their strongly colored glass and extensive sieving of plagioclase. One of several diverse lithologies collected from single location consisting of avalanche debris sitting on top of Red Glacier at ~2400 foot elevation. This location is at a fork in the glacier, and these samples could have come from either the main cone or North Twin. This location covered by subsequent rock/snow/ice avalanches (seen in landsat image on GE). "i" denotes fist-sized rounded blobs of macroscopically different magma enclosed in homogeneous host.

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

GEOCHEM DATA
StationIDLatitudeLongitudeGeologistDateVisitedAge InfoVolcanoEruptionLocation DescriptionText DescriptionSample IDSample Type 1Sample Type 2Geologic 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
91CNI0760.01098-152.99019Nye, C. J.1991-07-23 IliamnaLatitude and longitude determined using Google Earth.Porphyritic two-pyroxene low-silica andesite. Phenocrysts of plagioclase (35%, up to 1.7 mm), clinopyroxene (20%, typically 0.5 mm diameter stubby prisms), and orthopyroxene (5%). Groundmass consists of abundant microlites (typically < 20 microns) with subordinate deep reddish-brown glass. Most plagioclase phenocrysts are extensively sieved. 91CNI01, 07, and 12 are petrographically similar to each other, and different from typical Iliamna lavas in this suite in their strongly colored glass and extensive sieving of plagioclase. One of several diverse lithologies collected from single location consisting of avalanche debris sitting on top of Red Glacier at ~2400 foot elevation. This location is at a fork in the glacier, and these samples could have come from either the main cone or North Twin. This location covered by subsequent rock/snow/ice avalanches (seen in landsat image on GE). "i" denotes fist-sized rounded blobs of macroscopically different magma enclosed in homogeneous host.91CNI07LavaWhole-rock 56.99 0.684 18.29 0.139 4.17 8.4 3.81 0.848 0.142 99.0813291XRF6.54 0.61963 14.83916 314.15834 8.29256 17.96353 2.64336 11.59029 2.95189 0.98039 3.01281 0.51482 3.26556 0.66234 1.77412 0.27643 1.79685 0.29703 17.46966 1.59333 2.07541 0.09658 3.73665 1.47667 0.74635 13291ICPMS 16 295 471 13 22 17 90 3.3 4 3 22 205 25 8 88 71 1913291XRF

SAMPLE LOCATION

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