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SAMPLE INFO : 54-Sn-264
Sample ID:54-Sn-264
Station ID:54-Sn-264
Latitude:53.88707
Longitude:-166.93202
Datum:NAD83
Date Sampled:1954-01-01
Sample Type 1:Countryrock
Sample Type 2:Plutonic
Field Lithology:Gabbroic
Text Description:
Quartz gabbro from elevation 1,000 feet on the west-facing hill slope 2 3/4 miles southwest of Tarasof Point. The texture is hypidiomorphic-granular. Felsic minerals compose 75-80 percent of the rock: 4-6 percent quartz, <0.1 percent orthoclase, and 70-75 percent plagioclase slightly altered to sericite (<0.1 percent). The plagioclase composition, by extinction angle, is An54 [mean of 36 crystals, standard deviation is 7 percent An, average amount of zoning per individual plagioclase crystal is 9 percent An per crystal]. Mafic minerals compose 20-25 percent: 0.5-1.5 percent clinopyroxene (remnants in hornblende and euhedra in feldspar), 8-10 percent hornblende (an indeterminate amount derived from clinopyroxene), 6-8 percent biotite slightly altered to penninite (<0.1 percent) and cliozoisite (<0.1 percent), 2-5 percent magnetite, <0.1 percent hematite, 0.5-1.5 percent apatite, 0.5-1 percent tourmaline, and 0.1-1 percent penninite (interstitial).

References:
Geology of Unalaska Island and adjacent insular shelf, Aleutian Islands, Alaska

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
54-Sn-26453.88707-166.93202Snyder, G. L.1954-01-01 MakushinGranodiorite and related rocks from 4 mi E of Cape Starichkof. Elevation 1,000 feet on the west-facing hill slope 2 3/4 miles southwest of Tarasof Point.Quartz gabbro from elevation 1,000 feet on the west-facing hill slope 2 3/4 miles southwest of Tarasof Point. The texture is hypidiomorphic-granular. Felsic minerals compose 75-80 percent of the rock: 4-6 percent quartz, <0.1 percent orthoclase, and 70-75 percent plagioclase slightly altered to sericite (<0.1 percent). The plagioclase composition, by extinction angle, is An54 [mean of 36 crystals, standard deviation is 7 percent An, average amount of zoning per individual plagioclase crystal is 9 percent An per crystal]. Mafic minerals compose 20-25 percent: 0.5-1.5 percent clinopyroxene (remnants in hornblende and euhedra in feldspar), 8-10 percent hornblende (an indeterminate amount derived from clinopyroxene), 6-8 percent biotite slightly altered to penninite (<0.1 percent) and cliozoisite (<0.1 percent), 2-5 percent magnetite, <0.1 percent hematite, 0.5-1.5 percent apatite, 0.5-1 percent tourmaline, and 0.1-1 percent penninite (interstitial).54-Sn-264CountryrockEnclave/InclusionWhole-rock 54.9 0.94 18.6 7.1 0.16 4.5 7.8 3.6 1.1 0.22Total not given in table. 99.78315RAPIDA2.64.8H2OM=0.08; H2OP=0.77; CO2=0.05; Cl=0.1; F=0.01RAPIDA

SAMPLE LOCATION

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