Geologic map of Mount Chiginagak volcano, Alaska
type: Dataset
description: Report of Investigation 2017-10, Geologic map of Mount Chiginagak volcano, Alaska, provides 1:25,000 geologic mapping of the Chiginagak volcano. Mount Chiginagak is a hydrothermally active volcano on the Alaska Peninsula, approximately 170 km south-southwest of King Salmon, Alaska. This small stratovolcano, approximately 8 km in diameter, has erupted through Tertiary to Permian sedimentary and igneous rocks. The eruptive products of Chiginagak volcano record a history of chiefly andesite lava flows and associated block-and-ash flows. The oldest lavas exposed are Pleistocene in age and are found everywhere around the edifice except in the northeast sector, where Holocene lava flows dominate the landscape. Holocene activity has covered the northeast flank with rubbly-topped andesite lava flows that extend as far as 4.6 km from their source vent at the summit crater. The farthest-reaching volcanic deposits are on the southeast flank, where block-and-ash-flow, pyroclastic-flow, and lahar deposits extend down valley as far as 9 km from the summit. Limited exposure of deposits of a presumed plinian eruption of middle Pleistocene age indicate at least one episode of explosive activity in Chiginagak's past. This 1:25,000 scale geologic map and accompanying report document the age, geochemical, and spatial distribution of eruptive products of the Mount Chiginagak volcano. Map units are interpreted from field observations, satellite imagery interpretation, geochemical and geochronological analysis. The complete report, geodatabase, and ESRI fonts and style files are available from the DGGS website: http://doi.org/10.14509/29769.
issued: 2025-11-22T17:51:45.419360
modified: 2025-11-22T17:51:45.419365
spatial: Location
keyword: alaska-peninsula
keyword: aleutian-range
keyword: amerigeo
keyword: amerigeoss
keyword: analyses
keyword: chiginagak
keyword: ckan
keyword: gas
keyword: gems-ncgmp09
keyword: geo
keyword: geochemistry
keyword: geochronology
keyword: geologic
keyword: geologic-map
keyword: geology
keyword: geoss
keyword: hazards
keyword: holocene
keyword: igneous
keyword: lahar
keyword: mount-chiginagak
keyword: naknek-formation
keyword: national
keyword: neoglacial
keyword: north-america
keyword: pleistocene
keyword: pumice
keyword: rocks
keyword: sediment
keyword: sulfur
keyword: surface
keyword: surficial
keyword: tephra
keyword: ugashik-quadrangle
keyword: united-states
keyword: volcanic
keyword: volcanic-ash
keyword: volcanic-eruption
keyword: volcanic-gas
keyword: volcanic-rocks
keyword: volcaniclastic-deposits
keyword: volcaniclastics
keyword: volcanoes
keyword: volcanology
keyword: water

Web Resource
type: Distribution
issued: 2022-03-08T00:32:36.854415
modified: 2025-11-22T17:51:45.395230
access URL: https://dggs.alaska.gov/pubs/id/12928

Web Resource
type: Distribution
issued: 2022-03-08T00:32:36.854412
modified: 2025-11-22T17:51:45.394813
access URL: https://doi.org/10.14509/29769

geodatabase
type: Distribution
description: CSDGM IMPORT ERROR: No digtinfo/formcont
issued: 2022-03-08T00:32:36.854405
modified: 2025-11-22T17:51:45.394384
access URL: https://doi.org/10.14509/29769

Web Resource
type: Distribution
issued: 2022-03-08T00:32:36.854418
modified: 2025-11-22T17:51:45.395614
access URL: https://doi.org/10.14509/25602

US Migrating
type: Agent