| one publication added to basket [77119] | Petrologic and foraminiferal evidence for active downslope transport in Wilmington Canyon
In: Marine Geology. Elsevier: Amsterdam. ISSN 0025-3227; e-ISSN 1872-6151, more
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| Keywords |
Aquatic sciences > Marine sciences > Geology > Marine geology
Earth sciences > Geology > Petrology
Earth sciences > Geology > Sedimentology
Fossils > Animal fossils > Fossil foraminifera
Sedimentation
Topographic features > Submarine features > Submarine canyons
Transport > Sediment transport
Marine/Coastal |
| Authors | | Top |
- Stanley, D.J.
- Culver, S.J.
- Stubblefield, W.L.
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| Abstract |
The texture and composition of surficial sediment collected by DRSV Alvin in a meandering part of Wilmington Canyon, on the upper rise off the Mid-Atlantic States, indicate that deposition from gravity flow or bottom current, or both, has occurred in this sector in recent time. The marked petrologic and foraminiferal variations between closely spaced sample sites across the canyon axis show a distinct pattern that is closely related to the configuration of the thalweg. The sediment distribution pattern recalls that in sinuous fluvial systems: the presence of higher proportions of sand, terrigenous grains and displaced "shallow" water (shelf-upper slope) foraminifera close to the incised part of meanders is a result of active erosion. The irregular down-core variations of texture, terrigenous grains and biogenic components tend to favor a discontinuous "stop-and-go" transport process. The nature and distribution of mixed assemblages of "shallow" and "deep" (lower slope and rise) benthonic and planktonic foraminifera also indicate a downslope-directed transport process involving several pulse-like redepositional phases. |
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