AVO Logo
Site Map | FAQ |
Alaska Volcano Observatory
 
You are here: Home > Samples > UT746

SAMPLE INFO : UT746
Sample ID:UT746
Station ID:Eva_II
Latitude:64.8516
Longitude:-148.015
Datum:NAD83
Sample Type 1:Tephra Fall
Text Description:
Microfaulted bed, up to 6 cm thick, that is preserved in a solifluction fold; dark-colored minerals are concentrated in the 1-cm-thick basal layer that is overlain by a 2-cm-thick, white, vitric component that is capped by reworked, cross-bedded, crystal-rich sand. Undulatory basal contact. 7.5Y8/2.

References:
Tephrostratigraphy of the late Cenozoic Gold Hill loess, Fairbanks area, Alaska
Tephrochronology of late Cenozoic loess at Fairbanks, central Alaska
Age of Sheep Creek Tephra (Pleistocene) in central Alaska from thermoluminescence dating of bracketing loess
Changing ideas on the identity and stratigraphic significance of the Sheep Creek tephra beds in Alaska and the Yukon Territory, northwestern North America

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
Eva_II64.8516-148.015Preece, S. J.< 190000 ± 20000 stratigraphy; 4365; This is the maximum age of all Sheep Creek tephra from Westgate and others (2007), who demonstrated that the Sheep Creek tephra is actually made up of several stratigraphic units.Exposure on the west side of EVA Creek mining cut, Ester, Alaska; Gold Hill Loess overlies the Dawson Cut Formation and is unconformably covered by the interglacial Eva Forest Bed. Location coordinates from Preece et al. (2011); datum not specified, assumed to be NAD83.Microfaulted bed, up to 6 cm thick, that is preserved in a solifluction fold; dark-colored minerals are concentrated in the 1-cm-thick basal layer that is overlain by a 2-cm-thick, white, vitric component that is capped by reworked, cross-bedded, crystal-rich sand. Undulatory basal contact. 7.5Y8/2.UT746Tephra FallCumulateGlass 72.67 0.27 16.46 2.05Reported analytical value of zero. Reported standard deviation value of zero. 0Reported analytical value of zero. Reported standard deviation value of zero. 0 2.62 4.02 1.91 93.5756EMP2.05Cl=0 0.94 40 671 651 10 19 6.2 1.19 0.42 0.13 0.44 0.08 2.52 0.3 2.5 0.95 2.97 4.03 56 56INAA
Eva_II64.8516-148.015Preece, S. J.< 190000 ± 20000 stratigraphy; 4365; This is the maximum age of all Sheep Creek tephra from Westgate and others (2007), who demonstrated that the Sheep Creek tephra is actually made up of several stratigraphic units.Exposure on the west side of EVA Creek mining cut, Ester, Alaska; Gold Hill Loess overlies the Dawson Cut Formation and is unconformably covered by the interglacial Eva Forest Bed. Location coordinates from Preece et al. (2011); datum not specified, assumed to be NAD83.Microfaulted bed, up to 6 cm thick, that is preserved in a solifluction fold; dark-colored minerals are concentrated in the 1-cm-thick basal layer that is overlain by a 2-cm-thick, white, vitric component that is capped by reworked, cross-bedded, crystal-rich sand. Undulatory basal contact. 7.5Y8/2.UT746Tephra FallCumulateGlass 72.67 0.27 16.46 2.05 2.62 4.02 1.91 2166EMP2.05H2O=6.4EMP

SAMPLE LOCATION

Contact AVO Privacy Accessibility Information Quality FOIA
URL: avo.alaska.edu/samples/sample_info.php
Page modified: August 1, 2017 15:29
Contact Information: AVO Web Team

twitter @alaska_avo
facebook alaska.avo
email Receive volcano updates by email: USGS VNS

This website is supported by the U.S. Geological Survey under Cooperative Agreement Grant G19AC00060 and G19AC00171.

Mention of trade names or commercial products does not constitute their endorsement by the U.S. Geological Survey.