AVO Logo
Site Map | FAQ |
Alaska Volcano Observatory
 
You are here: Home > Samples > UT899

SAMPLE INFO : UT899
Sample ID:UT899
Station ID:Halfway_House
Latitude:64.735
Longitude:-148.4594
Datum:NAD83
Sample Type 1:Tephra Fall
 Text Description:
Sub-sample of 30-cm-thick tephra. Thick, continuous tephra bed within the Upper Gold Hill Loess overlying basement schist and about 3 m below a laminated organic silt containing SD tephra. Lower 14 cm consist of four subhorizontal fining-upward layers, which are covered by 16 cm of reworked tephra. Samples UT899 and 900 occur together as pods within UT901. The contacts between the pods and UT901 are distinct to knifesharp; however, the contacts between UT899 and UT900 are distinct and subhorizontal. UT899 is the whitest (10YR8/1) and occurs as a 4-cm-thick powdery subunit at the bottom of the pods.

References:
Tephrostratigraphy of the late Cenozoic Gold Hill loess, Fairbanks area, Alaska
Tephrochronology of late Cenozoic loess at Fairbanks, central Alaska
A catalogue of late Cenozoic tephra beds in the Klondike Goldfields and adjacent areas, Yukon Territory
Old Crow tephra across eastern Beringia: a single cataclysmic eruption at the close of Marine Isotope Stage 6

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
Halfway_House64.735-148.4594Preece, S. J. 124000 ± 10000 known unit; 10271; Age is approximate. Revised glass fission-track age with re-calibration; four Old Crow Tephra sample glass fission-track ages (UT1434, UT613, UT501, UT613).Halfway House site: a 12-m-thick section of the Gold Hill Loess located on top of a rounded bedrock hill along the north side of the Parks Highway, ~50 km west of Fairbanks, Alaska. The exposure was created during construction of the George Parks Highway in the 1960s and is mostly comprised of the Goldstream Formation. Location coordinates from Preece and others (2011); coordinates vary slightly from those reported in Jensen and others (2011). Datum not specified, assumed to be NAD83.Sub-sample of 30-cm-thick tephra. Thick, continuous tephra bed within the Upper Gold Hill Loess overlying basement schist and about 3 m below a laminated organic silt containing SD tephra. Lower 14 cm consist of four subhorizontal fining-upward layers, which are covered by 16 cm of reworked tephra. Samples UT899 and 900 occur together as pods within UT901. The contacts between the pods and UT901 are distinct to knifesharp; however, the contacts between UT899 and UT900 are distinct and subhorizontal. UT899 is the whitest (10YR8/1) and occurs as a 4-cm-thick powdery subunit at the bottom of the pods.UT899Tephra FallCumulateGlass 75.36 0.29 13.31 1.7Reported analytical value of zero. Reported standard deviation value of zero. 0 0.29 1.47 3.77 3.56 93.9856EMP1.7Cl=0.27EMP 4.66 99 855 122 26.86 56 26.4 5.9 0.92 0.79 3.86 0.68 6.39 0.85 10.47 4.17 6.8 3.84 52 56INAA

SAMPLE LOCATION

Contact AVO Privacy Accessibility Information Quality FOIA
URL: www.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 G22AC00137

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