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SAMPLE INFO : 54-Sn-284A
Sample ID:54-Sn-284A
Station ID:54-Sn-284A
Latitude:53.88707
Longitude:-166.93202
Datum:NAD83
Date Sampled:1954-01-01
Sample Type 1:Countryrock
Sample Type 2:Enclave/Inclusion
Field Lithology:Granitic
Text Description:
Recrystallized wallrock, equivalent to syenodiorite in composition, from a beach boulder at the southeast end of the north arm of Skan Bay: it occurs as an inclusion in granite. The texture is hypidiomorphic-granular. Felsic minerals compose 76-80 percent of the rock: 2-3 percent quartz, 5-10 percent orthoclase partially altered to kaolin (1-2 percent), and 65-70 percent plagioclase partially altered to sericite (2-3 percent) and clinozoisite (0.1 percent). The plagioclase composition, by extinction angle, is An35 (mean of 10 crystals, standard deviation is 6 percent An, average amount of zoning per individual plagioclase crystal is 11 percent An per crystal). Mafic minerals compose 20-25 percent: 10-14 percent hornblende (much is interstitial), 5-10 percent biotite partially altered to epidote (0.1-0.5 percent) and penninite (0.1-1 percent), 1-3 percent magnetite, 0.1-1 percent sphene (associated with the magnetite) partially altered to leucoxene (0.1-0.5 percent), one large grain of tourmaline (about 0.3 percent), and <0.01 percent hematite.

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-284A53.88707-166.93202Snyder, G. L.1954-01-01 MakushinInclusion in granite from head of N arm of Skan BayRecrystallized wallrock, equivalent to syenodiorite in composition, from a beach boulder at the southeast end of the north arm of Skan Bay: it occurs as an inclusion in granite. The texture is hypidiomorphic-granular. Felsic minerals compose 76-80 percent of the rock: 2-3 percent quartz, 5-10 percent orthoclase partially altered to kaolin (1-2 percent), and 65-70 percent plagioclase partially altered to sericite (2-3 percent) and clinozoisite (0.1 percent). The plagioclase composition, by extinction angle, is An35 (mean of 10 crystals, standard deviation is 6 percent An, average amount of zoning per individual plagioclase crystal is 11 percent An per crystal). Mafic minerals compose 20-25 percent: 10-14 percent hornblende (much is interstitial), 5-10 percent biotite partially altered to epidote (0.1-0.5 percent) and penninite (0.1-1 percent), 1-3 percent magnetite, 0.1-1 percent sphene (associated with the magnetite) partially altered to leucoxene (0.1-0.5 percent), one large grain of tourmaline (about 0.3 percent), and <0.01 percent hematite.54-Sn-284ACountryrockEnclave/InclusionWhole-rock 55.8 1 16.8 6.9 0.12 4.3 7.1 4.6 1.6 0.21Total not given in table. 99.75315RAPIDA3.24H2OM=0.1; H2OP=1.1; CO2=0.05; Cl=0.12; F=0.1RAPIDA

SAMPLE LOCATION

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