Crater Lake, Oregon: A restricted basin with base-of-slope aprons of nonchannelized turbidites
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Abstract
The basin floor of Crater Lake (10-km diameter, 600-m water depth) is covered by up to 75 m of sediment–gravity-flow deposits interbedded with mud. In the upper units (8 m (thick), sand and gravel layers with numerous wedging, strong seismic reflectors characterize the base-of-slope aprons at the basin margin. These layers evolve to turbidites of mainly thin, fine-grained, basin-plain type, characterized by numerous flat and weak seismic reflectors in the central basin floor. Many individual debris-chute sources funnel sediment to base-of-slope aprons: there, coarse-grained parts of the sediment–gravity flows deposit nonchannelized beds attributed to the F, A, B turbidite facies. While traversing the base-of-slope aprons, flows evolve to sheet-flow turbidity currents that deposit D-facies beds over the central basin floor. These processes and patterns of deposition characterize small siliciclastic basins without channelized submarine fans and are common in carbonate basins of all sizes.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Crater Lake, Oregon: A restricted basin with base-of-slope aprons of nonchannelized turbidites |
| Series title | Geology |
| DOI | 10.1130/0091-7613(1986)14<238:CLOARB>2.0.CO;2 |
| Volume | 14 |
| Issue | 3 |
| Year Published | 1986 |
| Language | English |
| Publisher | Geological Society of America |
| Description | 4 p. |
| First page | 238 |
| Last page | 241 |
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