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SAMPLE INFO : UT1592
Sample ID:UT1592
Station ID:Midnight_Dome_Terrace
Latitude:64.05
Longitude:-139.41
Datum:NAD83
Sample Type 1:Tephra Fall
Text Description:
In the lowermost interglacial silt of the Midnight Dome Loess; silt is reworked, about 0.3 m thick, and contains very thin pods (<5 mm) of the Mosquito Gulch tephra (UT1592-Preece et al.2000 is cited by Westgate et al. 2001 for more sample information; however, sample UT1592 does not appear to be mentioned in Preece et al. 2000). Type I beds have a low crystal content, abundant bubble-wall glass shards, pumice with large vesicles, and very small amounts of brown glass. Feldspar, orthopyroxene, and clinopyroxene are abundant with minor amounts of amphibole, magnetite, ilmenite, apatite, and zircon. From Preece et al. (2011): n.d. on deposit thickness; bubble-wall shards and pumice; in cryoturbated silt overlying bedded sand; ?1 m above basal gravel and sand; field name DOA97-16. Sample collected by A. Duk-Rodkin, 1997.

References:
A catalogue of late Cenozoic tephra beds in the Klondike Goldfields and adjacent areas, Yukon Territory
Dating Early and Middle (Reid) Pleistocene glaciations in central Yukon by tephrochronology

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
Midnight_Dome_Terrace64.05-139.41Froese, D. G. 1450000 ± 140000 known unit; 10311; Age is approximate. Weighted mean age based on four separate determinations corrected for partial track fading: three diameter-corrected fission-track (DCFT) ages on UT19 and one isothermal plateau fission-track (ITPFT) age on the correlative NT tephra (UT1104) from Fairbanks (originally reported in Preece and others 1999).The Midnight Dome site is located on an intermediate terrace, approximately 100 m above the modern valley-floor, 2 km east of Dawson City along the Midnight Dome road, Yukon Territory, Canada. The site consists of fluvial and glaciofluvial gravel overlying bedrock, covered by 10 -14 m of loess, retransported loess and colluvial deposits. Datum not specified, assumed to be NAD83.In the lowermost interglacial silt of the Midnight Dome Loess; silt is reworked, about 0.3 m thick, and contains very thin pods (<5 mm) of the Mosquito Gulch tephra (UT1592-Preece et al.2000 is cited by Westgate et al. 2001 for more sample information; however, sample UT1592 does not appear to be mentioned in Preece et al. 2000). Type I beds have a low crystal content, abundant bubble-wall glass shards, pumice with large vesicles, and very small amounts of brown glass. Feldspar, orthopyroxene, and clinopyroxene are abundant with minor amounts of amphibole, magnetite, ilmenite, apatite, and zircon. From Preece et al. (2011): n.d. on deposit thickness; bubble-wall shards and pumice; in cryoturbated silt overlying bedded sand; ?1 m above basal gravel and sand; field name DOA97-16. Sample collected by A. Duk-Rodkin, 1997.UT1592Tephra FallCumulateGlass 75.48 0.35 13.36 1.82 0.1 0.25 1.45 5.12 1.88 10311EMP1.82Cl=0.2; H2O=4.6EMP

SAMPLE LOCATION

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