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SAMPLE INFO : 415
Sample ID:415
Station ID:415
Latitude:58.2654
Longitude:-155.1591
Datum:NAD83
Text Description:
Porphyritic specimen. Examination in thin section reveals that the specimen is made up largely of the outer shells of fresh-looking phenocrystic and lathlike feldspars, with interiors replaced by isotropic glass. A little quartz and one or two small crystals of an altered ferromagnesian mineral, probably biotite, are also present. The feldspathic shells are thin, but each is fairly continuous, and both twinning and zoning are plainly visible. The appearance suggests an andesite or a fine-grained diorite as the original rock.

References:
The Katmai magmatic province

GEOCHEM DATA
StationIDLatitudeLongitudeGeologistDateVisitedAge InfoVolcanoEruptionLocation DescriptionText DescriptionSample IDMaterialSiO2TiO2Al2O3FeOTMnOMgOCaONa2OK2OP2O5Total-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
41558.2654-155.1591Fenner, C. N. NovaruptaPorphyritic specimen. Examination in thin section reveals that the specimen is made up largely of the outer shells of fresh-looking phenocrystic and lathlike feldspars, with interiors replaced by isotropic glass. A little quartz and one or two small crystals of an altered ferromagnesian mineral, probably biotite, are also present. The feldspathic shells are thin, but each is fairly continuous, and both twinning and zoning are plainly visible. The appearance suggests an andesite or a fine-grained diorite as the original rock.415Whole Rock 85.03 0.94 7.83 0.01 0.37 2.33 2.27 0.61 0.1 99.91176NN0.270.34H2OP=2.35; H2OM=4.9NNCl V=0.77, M=NN, R=1176;SO3 V=0.05, M=NN, R=1176;

SAMPLE LOCATION

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