Across-shelf sediment transport since the Last Glacial Maximum, southern California margin
Geology
By: C.K. Sommerfield and H.J. Lee
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Abstract
Correlation of continental shelf-slope stratigraphy in Santa Monica Bay (southern California) with Ocean Drilling Program records for nearby slope-basin sites has illuminated the timing and scale of terrigenous sediment dispersal on margin since the Last Glacial Maximum (LGM). Marine flooding surfaces preserved in a transgressive sequence on the Santa Monica Shelf provide a key link between base-level elevation and sediment transport across shelf. Sediment-accumulation rates at slope-basin sites were maximal ca. 15-10 ka, well after the LGM, decreased during the 12-9 ka transition from fluvial-estuarine to fully marine conditions on the shelf, and decelerated throughout the Holocene to 30%-75% of their values at the LGM. The deceleration is interpreted to manifest a landward shift in the margin depocenter with the onset of transgressive sedimentation beginning when sea level surmounted the shelf edge ca. 13 ka, as predicted by sequence-stratigraphic models. However, the records make clear that factors other than base level modulated slope-basin accumulation rates during the deglaciation. ?? 2004 Geological Society of America.
Suggested Citation
Sommerfield, C., and Lee, H., 2004, Across-shelf sediment transport since the Last Glacial Maximum, southern California margin: Geology, v. 32, no. 4, p. 345-348, https://doi.org/10.1130/G20182.2.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Across-shelf sediment transport since the Last Glacial Maximum, southern California margin |
| Series title | Geology |
| DOI | 10.1130/G20182.2 |
| Volume | 32 |
| Issue | 4 |
| Year Published | 2004 |
| Language | English |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Geology |
| First page | 345 |
| Last page | 348 |