AVO Logo
Site Map | FAQ |
Alaska Volcano Observatory
 
You are here: Home > Samples > 91CNI12

SAMPLE INFO : 91CNI12
Sample ID:91CNI12
Station ID:91CNI12
Latitude:60.01098
Longitude:-152.99017
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 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
91CNI1260.01098-152.99017Nye, 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.91CNI12LavaWhole-rock 57.28 0.687 18.24 0.139 4.17 8.34 3.81 0.854 0.143 99.5213291XRF6.34 0.61725 16 290 468 12 11 2.63516 11.89367 3.02178 1.00429 3.03195 0.52468 3.28763 0.69518 1.92153 0.28037 1.84732 0.3037 18 90 1.6 2.1503 0.11117 4 1 0.7698 24 207 23 11 76 76 19 13291ICPMS: Cs, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Hf, Ta, U; XRF: Rb, Ba, Sr, La, Ce, Y, Zr, Nb, Pb, Th, Sc, V, Cr, Ni, Cu, Zn, Ga;

SAMPLE LOCATION

Contact AVO Privacy Accessibility Information Quality FOIA
URL: www.avo.alaska.edu/samples/sample_info.php
Page modified: August 1, 2017 15:29
Contact Information: AVO Web Team

twitter @alaska_avo
facebook alaska.avo
email Receive volcano updates by email: USGS VNS

This website is supported by the U.S. Geological Survey under Cooperative Agreement Grant G22AC00137

Mention of trade names or commercial products does not constitute their endorsement by the U.S. Geological Survey.