Marine tephrochronology of the Mt. Edgecumbe volcanic field, southeast Alaska, USA
Quaternary Research
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Abstract
The Mt. Edgecumbe Volcanic Field (MEVF), located on Kruzof Island near Sitka Sound in southeast Alaska, experienced a large multiple-stage eruption during the last glacial maximum (LGM)-Holocene transition that generated a regionally extensive series of compositionally similar rhyolite tephra horizons and a single well-dated dacite (MEd) tephra. Marine sediment cores collected from adjacent basins to the MEVF contain both tephra-fall and pyroclastic flow deposits that consist primarily of rhyolitic tephra and a minor dacitic tephra unit. The recovered dacite tephra correlates with the MEd tephra, whereas many of the rhyolitic tephras correlate with published MEVF rhyolites. Correlations were based on age constraints and major oxide compositions of glass shards. In addition to LGM-Holocene macroscopic tephra units, four marine cryptotephras were also identified. Three of these units appear to be derived from mid-Holocene MEVF activity, while the youngest cryptotephra corresponds well with the White River Ash eruption at not, vert, similar 1147 cal yr BP. Furthermore, the sedimentology of the Sitka Sound marine core EW0408-40JC and high-resolution SWATH bathymetry both suggest that extensive pyroclastic flow deposits associated with the activity that generated the MEd tephra underlie Sitka Sound, and that any future MEVF activity may pose significant risk to local population centers.
Suggested Citation
Addison, J.A., Beget, J.E., Ager, T.A., Finney, B., 2010, Marine tephrochronology of the Mt. Edgecumbe volcanic field, southeast Alaska, USA: Quaternary Research, v. 73, no. 2, p. 277-292, https://doi.org/10.1016/j.yqres.2009.10.007.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Marine tephrochronology of the Mt. Edgecumbe volcanic field, southeast Alaska, USA |
| Series title | Quaternary Research |
| DOI | 10.1016/j.yqres.2009.10.007 |
| Volume | 73 |
| Issue | 2 |
| Publication Date | January 20, 2017 |
| Year Published | 2010 |
| Language | English |
| Publisher | Elsevier |
| Publisher location | Amsterdam, Netherlands |
| Contributing office(s) | Geology and Environmental Change Science Center |
| Description | 16 p. |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Quaternary Research |
| First page | 277 |
| Last page | 292 |
| Country | United States |
| State | Alaska |
| Other Geospatial | Mt. Edgecumbe Volcanic Field |