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SAMPLE INFO : 90ADg-2
Sample ID:90ADg-2
Station ID:90ADg-2
Latitude:61.40280726422
Longitude:-141.70034121262
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
StationIDLatitudeLongitudeGeologistDateVisitedVolcanoLocation DescriptionText DescriptionSample IDCoeffSiO2TiO2Al2O3FeOTMnOMgOCaONa2OK2OP2O5Total-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 61.40280726422 -141.70034121262 McGimsey, R. G. 1990-00-00 Churchill, MtSummit area of Mount ChurchillSummit 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 67.165644635614 0.41046227903714 16.288344585206 2.8105413440834 0.060067650590801 1.3314995880961 4.1246453405684 4.3849384931285 2.4727849493213 0.35039462844634 100.255DCP3.122.8105413440834LOI=0.6DCP 825 9 bdl 27 55 55MX 806 106 5.2 67 bdl 55DCP: Ba, Sc, V; XRF: Zr; Cl V=average of 10 analyses, std dev of 0.030.25, M=EMP, R=187;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 61.40280726422 -141.70034121262 McGimsey, R. G. 1990-00-00 Churchill, MtSummit area of Mount ChurchillSummit 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-2average of 10 analyses, std dev of 0.46 75.51average of 10 analyses, std dev of 0.1 0.18average of 10 analyses, std dev of 0.37 14.24average of 10 analyses, std dev of 0.13 1.34 0.050722959412807 1.3796644960283average of 10 analyses, std dev of 0.08 1.74average of 10 analyses, std dev of 0.32 3.52average of 10 analyses, std dev of 0.1 3.22 0.14202428635586 98.73187EMP: SiO2, TiO2, Al2O3, FeOT, CaO, Na2O, K2O; NN: MnO, MgO, P2O5; 1.551.4H2OP=0.49; H2OM=0.13; CO2=0.04; H2O=6.19RAPIDA: H2OP, H2OM, CO2; EMP: H2O;

StationIDLatitudeLongitudeGeologistDateVisitedVolcanoLocation DescriptionText DescriptionSample IDSiO2TiO2Al2O3FeOTMnOMgOCaONa2OK2OP2O5Total-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 61.40280726422 -141.70034121262 McGimsey, R. G. 1990-00-00 Churchill, MtSummit area of Mount ChurchillSummit 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 67.165644635614 0.41046227903714 16.288344585206 2.8105413440834 0.060067650590801 1.3314995880961 4.1246453405684 4.3849384931285 2.4727849493213 0.35039462844634 100.255DCP3.122.8105413440834LOI=0.6DCP 825 9 bdl 27 55 55MX 806 106 5.2 67 bdl 55DCP: Ba, Sc, V; XRF: Zr; Cl V=average of 10 analyses, std dev of 0.030.25, M=EMP, R=187;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 61.40280726422 -141.70034121262 McGimsey, R. G. 1990-00-00 Churchill, MtSummit area of Mount ChurchillSummit 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-2average of 10 analyses, std dev of 0.46 75.51average of 10 analyses, std dev of 0.1 0.18average of 10 analyses, std dev of 0.37 14.24average of 10 analyses, std dev of 0.13 1.34 0.050722959412807 1.3796644960283average of 10 analyses, std dev of 0.08 1.74average of 10 analyses, std dev of 0.32 3.52average of 10 analyses, std dev of 0.1 3.22 0.14202428635586 98.73187EMP: SiO2, TiO2, Al2O3, FeOT, CaO, Na2O, K2O; NN: MnO, MgO, P2O5; 1.551.4H2OP=0.49; H2OM=0.13; CO2=0.04; H2O=6.19RAPIDA: H2OP, H2OM, CO2; EMP: H2O;

SAMPLE LOCATION

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