Home
Volcanoes
Webcams
News
Explore Data
Images
Get Involved
About AVO

Sample: UT1637

Sample ID: UT1637 [1] [2] [3]
Station ID: Jackson_Hill
AT Num:
Volcano:
Possible source:
Eruption:
Collector: Unknown, Unknown
Date sampled:
Sample type 1: Tephra Fall
Color: cream
Final unit:
Text Description: The tephra is present in the upper part of a 2-m-thick gully-fill deposit, the gully being incised about 10 m into the Klondike gravel, close to the level of the highest terrace along the Klondike River. The gully-fill sediments consist of 0.5 m of matrix-supported gravel overlain by 1.5 m of massive to crudely stratified, organic-rich silt. Discontinuous pods of Jackson Hill tephra, up to 3 cm thick, occur 50 cm below the surface in this silt. The lower diamict is interpreted as a hillslope deposit derived from downslope movement of the Klondike gravel into the gully, while the overlying silt is thought to represent retransported loess. Fine grain size. Consists mostly of bubble-wall glass shards with feldspar, orthopyroxene, clinopyroxene and minor amounts of green or red amphibole, titanomagnetite, ilmenite, apatite and zircon. From Preece et al. (2011): 3 cm thick; pumice, bubble-wall shards, spheres with a small amount of brown glass; in brown organic silt overlying Klondike Gravel; field name 799a
Sample Location:

References Cited

[1] The variegated (VT) tephra: A new regional marker for middle to late marine isotope stage 5 across Yukon and Alaska, 2011

Jensen, B.J.L., Preece, S.J., Lamothe, Michel, Pearce, N.J.G., Froese, D.G., Westgate, J.A., Schaefer, Janet, and Beget, Jim, 2011, The variegated (VT) tephra: A new regional marker for middle to late marine isotope stage 5 across Yukon and Alaska: Quaternary International, v. 246, p. 312-323, doi: 10.1016/j.quaint.2011.06.028.

[2] A catalogue of late Cenozoic tephra beds in the Klondike Goldfields and adjacent areas, Yukon Territory, 2011

Preece, S.J., Westgate, J.A., Froese, D.G., Pearce, N.J.G., and Perkins, W.T., 2011, A catalogue of late Cenozoic tephra beds in the Klondike Goldfields and adjacent areas, Yukon Territory: Canadian Journal of Earth Sciences, v. 48, p. 1386-1418, doi: 10.1139/e10-110

[3] Glass-fission-track ages of late Cenozoic distal tephra beds in the Klondike district, Yukon Territory, 2000

Sandhu, A.S., Westgate, J.A., Preece, S.J., and Froese, D.G., 2000, Glass-fission-track ages of late Cenozoic distal tephra beds in the Klondike district, Yukon Territory, in Emond, D.S., and Weston, L.H., (eds.), Yukon exploration and geology 2000: Exploration and Geological Services Division, Yukon, Indian and Northern Affairs Canada, p. 247-256.