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SAMPLE INFO : 90ADg-2
Sample ID:90ADg-2
Station ID:90ADg-2
Latitude:61.4028
Longitude:-141.7003
Datum:NAD83
Date Sampled:1990-00-00
Sample Type 1:Tephra Fall
Sample Type 2:Pumice
Text Description:
Summit pumice; loose accumulation of light-colored pumice, ranging in size from lapilli to blocks as much as 50 cm in diameter. Scattered throughout these tephra deposits, and locally abundant, are angular to subangular clasts of a variety of volcanic rocks, chiefly dark-colored, porphyritic and aphyric andesitic lava, and an occasional block of granitic rock and chlorite-rich amygdaloidal lava. The lithic fragments are similar in size to the pumice fragments and are interpreted to be rock ripped from the vent conduit walls during the explosive eruption(s). Also scattered throughout the tephra are clasts of yellow-orange pumice and lithics that apparently have been hydrothermally altered. Underlying this loose surface layer of pumice and lithic debris is a frozen zone of bedded tephra, consisting of pumice lapilli and blocks and exotic rock fragments disseminated in an ash matrix. White River Ash.

References:
Mount Churchill, Alaska: source of the late Holocene White River Ash

GEOCHEM DATA
StationIDLatitudeLongitudeGeologistDateVisitedAge InfoVolcanoEruptionLocation DescriptionText DescriptionSample IDSample Type 1Sample Type 2geologic unitMaterialCoeffSiO2TiO2Al2O3FeOTMnOMgOCaONa2OK2OP2O5Total-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
90ADg-2 61.4028 -141.7003 McGimsey, R. G. 1990-00-00 1250 known unit; 187; White River Ash Churchill, Mt Summit area of Mount Churchill Summit pumice; loose accumulation of light-colored pumice, ranging in size from lapilli to blocks as much as 50 cm in diameter. Scattered throughout these tephra deposits, and locally abundant, are angular to subangular clasts of a variety of volcanic rocks, chiefly dark-colored, porphyritic and aphyric andesitic lava, and an occasional block of granitic rock and chlorite-rich amygdaloidal lava. The lithic fragments are similar in size to the pumice fragments and are interpreted to be rock ripped from the vent conduit walls during the explosive eruption(s). Also scattered throughout the tephra are clasts of yellow-orange pumice and lithics that apparently have been hydrothermally altered. Underlying this loose surface layer of pumice and lithic debris is a frozen zone of bedded tephra, consisting of pumice lapilli and blocks and exotic rock fragments disseminated in an ash matrix. White River Ash. 90ADg-2 Tephra Fall Cumulate Glass 75.51 0.18 14.24 1.34 1.74 3.52 3.22 187EMP1.34H2O=6.19EMPCl V=0.25, M=EMP, R=187;

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
90ADg-2 61.4028 -141.7003 McGimsey, R. G. 1990-00-00 1250 known unit; 187; White River Ash Churchill, Mt Summit area of Mount Churchill Summit pumice; loose accumulation of light-colored pumice, ranging in size from lapilli to blocks as much as 50 cm in diameter. Scattered throughout these tephra deposits, and locally abundant, are angular to subangular clasts of a variety of volcanic rocks, chiefly dark-colored, porphyritic and aphyric andesitic lava, and an occasional block of granitic rock and chlorite-rich amygdaloidal lava. The lithic fragments are similar in size to the pumice fragments and are interpreted to be rock ripped from the vent conduit walls during the explosive eruption(s). Also scattered throughout the tephra are clasts of yellow-orange pumice and lithics that apparently have been hydrothermally altered. Underlying this loose surface layer of pumice and lithic debris is a frozen zone of bedded tephra, consisting of pumice lapilli and blocks and exotic rock fragments disseminated in an ash matrix. White River Ash. 90ADg-2 Tephra Fall Cumulate Whole Rock 67.16 0.41 16.29 2.81 0.06 1.33 4.12 4.38 2.47 0.35 100.255DCP3.122.81LOI=0.6DCP 825 9 bdl 27 55 55MX 806 106 5.2 67 bdl 55DCP: Ba, Sc, V; XRF: Zr; Rb V=46, M=NN, R=187;Sr V=830, M=NN, R=187;Ba V=870, M=NN, R=187;Ce V=48, M=NN, R=187;La V=22 <30, M=NN, R=187;Nb V=6 <10, M=NN, R=187;Zr V=152, M=NN, R=187;Y V=8 <10, M=NN, R=187;Cu V=38, M=NN, R=187;Ni V=14 <10, M=NN, R=187;Zn V=62, M=NN, R=187;Cr V=9 <20, M=NN, R=187;
90ADg-2 61.4028 -141.7003 McGimsey, R. G. 1990-00-00 1250 known unit; 187; White River Ash Churchill, Mt Summit area of Mount Churchill Summit pumice; loose accumulation of light-colored pumice, ranging in size from lapilli to blocks as much as 50 cm in diameter. Scattered throughout these tephra deposits, and locally abundant, are angular to subangular clasts of a variety of volcanic rocks, chiefly dark-colored, porphyritic and aphyric andesitic lava, and an occasional block of granitic rock and chlorite-rich amygdaloidal lava. The lithic fragments are similar in size to the pumice fragments and are interpreted to be rock ripped from the vent conduit walls during the explosive eruption(s). Also scattered throughout the tephra are clasts of yellow-orange pumice and lithics that apparently have been hydrothermally altered. Underlying this loose surface layer of pumice and lithic debris is a frozen zone of bedded tephra, consisting of pumice lapilli and blocks and exotic rock fragments disseminated in an ash matrix. White River Ash. 90ADg-2 Tephra Fall Cumulate Whole Rock 67.1 0.43 16.4 2.83 0.05 1.38 4.24 4.22 2.55 0.14 98.73187NN1.551.4H2OP=0.49; H2OM=0.13; CO2=0.04RAPIDARb V=46, M=NN, R=187;Sr V=830, M=NN, R=187;Ba V=870, M=NN, R=187;Ce V=48, M=NN, R=187;La V=22 <30, M=NN, R=187;Nb V=6 <10, M=NN, R=187;Zr V=152, M=NN, R=187;Y V=8 <10, M=NN, R=187;Cu V=38, M=NN, R=187;Ni V=14 <10, M=NN, R=187;Zn V=62, M=NN, R=187;Cr V=9 <20, M=NN, R=187;

SAMPLE LOCATION

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