Aniakchak Precaldera Dacite
Start: 14000 yBP [1]
Stop: 3430 yBP [1]
Event Type: Effusive
Description: From Bacon and others (2014): "Two lava flows and several pyroclastic deposits are younger than the last major glacial advance but preceded the Aniakchak II caldera-forming eruption."
"A blocky flow of dacite lava is present on the northeast flank of Aniakchak volcano (fig. 4 [in original text], included in unit Qbn). Compositional affinity of the lava with deposits on the caldera rim indicates that the flow likely postdates Aniakchak I. Dreher (2002, p. 17) reported Aniakchak II lithic breccia resting on the lava."
Neal and others (2001) also report a dacite lava flow (on northwest flank?).
"A blocky flow of dacite lava is present on the northeast flank of Aniakchak volcano (fig. 4 [in original text], included in unit Qbn). Compositional affinity of the lava with deposits on the caldera rim indicates that the flow likely postdates Aniakchak I. Dreher (2002, p. 17) reported Aniakchak II lithic breccia resting on the lava."
Neal and others (2001) also report a dacite lava flow (on northwest flank?).
References Cited
[1] Postglacial eruptive history, geochemistry, and recent seismicity of Aniakchak Volcano, Alaska, 2014
Bacon, C.R., Neal, C.A., Miller, T.P., McGimsey, R.G., and Nye, C.J., 2014, Postglacial eruptive history, geochemistry, and recent seismicity of Aniakchak Volcano, Alaska: U.S. Geological Survey Professional Paper 1810, 74 p., http://dx.doi.org/10.3133/pp1810, available online at http://pubs.usgs.gov/pp/1810/
[2] Preliminary volcano-hazard assessment for Aniakchak Volcano, Alaska, 2001
Neal, Christina, McGimsey, R. G., Miller, T. P., Riehle, J. R., and Waythomas, C. F., 2001, Preliminary volcano-hazard assessment for Aniakchak Volcano, Alaska: U.S. Geological Survey Open-File Report 00-0519, 35 p.
full-text PDF 24.2 MB Complete Eruption References
Postglacial eruptive history, geochemistry, and recent seismicity of Aniakchak Volcano, Alaska, 2014
Bacon, C.R., Neal, C.A., Miller, T.P., McGimsey, R.G., and Nye, C.J., 2014, Postglacial eruptive history, geochemistry, and recent seismicity of Aniakchak Volcano, Alaska: U.S. Geological Survey Professional Paper 1810, 74 p., http://dx.doi.org/10.3133/pp1810, available online at http://pubs.usgs.gov/pp/1810/