Sedimentation in a blast-zone lake at Mount St. Helens, Washington—Implications for varve formation
Geology
By: R.Y. Anderson, E.B. Nuhfer, and Walter E. Dean
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Abstract
Sediment collected in traps in a newly formed lake in the blast-impact area at Mount St. Helens recorded a sediment yield that is about two orders of magnitude greater than for comparable basins with vegetation and similar precipitation. Most sediment was mobilized by storms and runoff at the onset of the wet season. The sedimentation response to strongly seasonal precipitation, in the absence of vegetation, produced turbidites and graded annual couplets. The style of sedimentation suggests an alternate mechanism for the formation of long sequences of graded clastic varves.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Sedimentation in a blast-zone lake at Mount St. Helens, Washington—Implications for varve formation |
| Series title | Geology |
| DOI | 10.1130/0091-7613(1985)13<348:SIABLA>2.0.CO;2 |
| Volume | 13 |
| Issue | 5 |
| Year Published | 1985 |
| Language | English |
| Publisher | GSA |
| Contributing office(s) | Geosciences and Environmental Change Science Center |
| Description | 5 p. |
| First page | 348 |
| Last page | 352 |
| Country | United States |
| State | Washington |
| Other Geospatial | Mount St. Helens |
| Google Analytic Metrics | Metrics page |