Structures in the Dacitic Flows at Crater Lake, Oregon
Allen JE. 1936. Structures in the Dacitic Flows at Crater Lake, Oregon. The Journal of Geology. 44:737-744
Flow structures and other features of the later lavas of Mount Mazama (Crater Lake), show that they had a viscosity between that exhibited by plug domes and that of "normal" lava flows. Three distinct flows are described, and evidence of the high gas content of the lava is given. The mechanics of their viscous outflow, as inferred from the structures, offers an explanation of the features of Rugged Crest. The "back-flow," heretofore cited as proof of subsidence of the mountain, is interpreted as the vent-filling for one of the flows.
- Type
- Journal Article
- Authors
- Allen, J
- Units
- CRLA
- Keywords
- Dacite, Lava Flows, Minerals, Physical Sciences