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SAMPLE INFO : UT622
Sample ID:UT622
Station ID:CRH94
Latitude:68.25194444
Longitude:-139.7744444
Datum:NAD83
Sample Type 1:Tephra Fall
Field Lithology:Rhyolite
Text Description:
Occurs as pods of tephra, up to 25 cm thick, within lacustrine or pond deposits of clayey silt to silty clay near the base of the section. Likely separated into pods as a result of loading into the underlying sediments, which must have been saturated and of low bulk density relative to the tephra when the latter was deposited. Pumiceous glass with sparse amounts of bubble-wall shards. Abundant hornblende (dark greenish-brown in color), hypersthene (more abundant in this than in Surprise Creek tephra), and plagioclase; Fe-Ti oxides and oxyhornblende are present but not conspicuous.

References:
Geochemical variation in the less than 5 Ma Wrangell Volcanic Field, Alaska, with an emphasis on the Skookum Creek volcanic complex
Tephrochronology, magnetostratigraphy and mammalian faunas of Middle and Early Pleistocene sediments at two sites on the Old Crow River, northern Yukon Territory, Canada
Trace-element analysis of volcanic glass shards by laser ablation inductively coupled plasma mass spectrometry: application to tephrochronological studies

GEOCHEM DATA
StationIDLatitudeLongitudeGeologistDateVisitedAge InfoVolcanoEruptionLocation DescriptionText DescriptionSample IDSample Type 1Sample Type 2Final 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
CRH9468.25194444-139.7744444Westgate, J. A. Located on the right bank of the Old Crow River, about 65 km by air to the southeast of site CRH47. Twenty-six-m-high exposure comprised predominantly of alluvial silt, clayey silt, and sand that exhibit shallow channel structures, and, in places, contain peat, molluscs, and wood fragments. Near the base of the section, lacustrine or pond deposits of clayey silt to silty clay occur, which enclose pods of tephra up to 25 cm thick. Initially visited by J.V. Matthews Jr., Charles Schweger, and Richard Morlan during the 1980s as part of reconnaissance studies on Quaternary deposits exposed in the bluffs of the Old Crow River. Site designation made by C.R. Harington. Site revisited by John Westgate in 1985 as part of stratigraphic investigations. Coordinates provided as degrees/minutes/seconds in Westgate and others (2013) and converted to decimal degrees; datum not specified, assumed to be NAD83. Occurs as pods of tephra, up to 25 cm thick, within lacustrine or pond deposits of clayey silt to silty clay near the base of the section. Likely separated into pods as a result of loading into the underlying sediments, which must have been saturated and of low bulk density relative to the tephra when the latter was deposited. Pumiceous glass with sparse amounts of bubble-wall shards. Abundant hornblende (dark greenish-brown in color), hypersthene (more abundant in this than in Surprise Creek tephra), and plagioclase; Fe-Ti oxides and oxyhornblende are present but not conspicuous.UT622Tephra FallCumulateGlass 75.8 0.28 13.95 1.24 1.66 4.24 2.75 55EMP1.24Cl=0.24; H2O=6.16EMP 57 938 375 48 19 3.1 0.92 2.81 1.93 1.09 1.18 0.17 9 144 4 2.07 1.95 39 55INAA: Rb, Ba, Ce, Nd, Sm, Eu, Yb, Lu, Zr, Th, U, Sc, Zn; LA-ICP: Sr, Gd, Dy, Er, Y;
CRH9468.25194444-139.7744444Westgate, J. A. Located on the right bank of the Old Crow River, about 65 km by air to the southeast of site CRH47. Twenty-six-m-high exposure comprised predominantly of alluvial silt, clayey silt, and sand that exhibit shallow channel structures, and, in places, contain peat, molluscs, and wood fragments. Near the base of the section, lacustrine or pond deposits of clayey silt to silty clay occur, which enclose pods of tephra up to 25 cm thick. Initially visited by J.V. Matthews Jr., Charles Schweger, and Richard Morlan during the 1980s as part of reconnaissance studies on Quaternary deposits exposed in the bluffs of the Old Crow River. Site designation made by C.R. Harington. Site revisited by John Westgate in 1985 as part of stratigraphic investigations. Coordinates provided as degrees/minutes/seconds in Westgate and others (2013) and converted to decimal degrees; datum not specified, assumed to be NAD83. Occurs as pods of tephra, up to 25 cm thick, within lacustrine or pond deposits of clayey silt to silty clay near the base of the section. Likely separated into pods as a result of loading into the underlying sediments, which must have been saturated and of low bulk density relative to the tephra when the latter was deposited. Pumiceous glass with sparse amounts of bubble-wall shards. Abundant hornblende (dark greenish-brown in color), hypersthene (more abundant in this than in Surprise Creek tephra), and plagioclase; Fe-Ti oxides and oxyhornblende are present but not conspicuous.UT622Tephra FallCumulateGlass Cl=0.24; H2O=6.16EMP 1.04 57 938 375 24 48 5.2 19 3.1 0.92 2.81 0.37 1.93 0.4 1.09 0.19 1.18 0.17 9 144 9.2 3.2 0.67 12 4 2.07 13 10621ICPMS
CRH9468.25194444-139.7744444Westgate, J. A. Located on the right bank of the Old Crow River, about 65 km by air to the southeast of site CRH47. Twenty-six-m-high exposure comprised predominantly of alluvial silt, clayey silt, and sand that exhibit shallow channel structures, and, in places, contain peat, molluscs, and wood fragments. Near the base of the section, lacustrine or pond deposits of clayey silt to silty clay occur, which enclose pods of tephra up to 25 cm thick. Initially visited by J.V. Matthews Jr., Charles Schweger, and Richard Morlan during the 1980s as part of reconnaissance studies on Quaternary deposits exposed in the bluffs of the Old Crow River. Site designation made by C.R. Harington. Site revisited by John Westgate in 1985 as part of stratigraphic investigations. Coordinates provided as degrees/minutes/seconds in Westgate and others (2013) and converted to decimal degrees; datum not specified, assumed to be NAD83. Occurs as pods of tephra, up to 25 cm thick, within lacustrine or pond deposits of clayey silt to silty clay near the base of the section. Likely separated into pods as a result of loading into the underlying sediments, which must have been saturated and of low bulk density relative to the tephra when the latter was deposited. Pumiceous glass with sparse amounts of bubble-wall shards. Abundant hornblende (dark greenish-brown in color), hypersthene (more abundant in this than in Surprise Creek tephra), and plagioclase; Fe-Ti oxides and oxyhornblende are present but not conspicuous.UT622Tephra FallCumulateGlass Cl=0.24; H2O=6.16EMP 1.34 61 1137 435.7 32.1 55 6.1 23 4.08 0.75 3.21 0.51 2.51 0.57 1.74 0.21 1.74 0.34 14.9 241 12.4 5.98 1.06 7.2 2.57 10601LA-ICP

SAMPLE LOCATION

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