The ~400 yr B.P. eruption of Half Cone, a post-caldera composite cone within Aniakchak caldera, Alaska Peninsula

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DGGS Professional Report 126, The ~400 yr B.P. eruption of Half Cone, a post-caldera composite cone within Aniakchak caldera, Alaska Peninsula, presents an investigation of the ~400 yr B.P. Half Cone eruption. This eruption is the largest post-caldera eruption yet identified from the Aniakchak volcano. Our goals for this study are to (1) describe the dispersal and volume of the ~400 yr B.P. Half Cone eruption based on stratigraphic characteristics of the resulting deposits, (2) evaluate the pre-eruption storage conditions of magmas expelled during the ~400 yr B.P. Half Cone eruption based on both whole-rock geochemical analyses of juvenile material and in situ geochemical analyses of mineral and glass regions of deposits, and (3) synthesize stratigraphic and geochemical observations into a chronology for the ~400 yr B.P. eruption. All files are available from the DGGS website: http://doi.org/10.14509/30839.

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