Bathymetry and sediment geometry of the Greater Antilles outer ridge and vicinity
In: Geological Society of America bulletin. GEOLOGICAL SOC AMER, INC: New York, N.Y.. ISSN 0016-7606; e-ISSN 1943-2674, more |  |
| Keywords | Data > Acoustic data
Interfaces > Sediment-water interface
Measurement > Depth measurement > Bathymetry
Motion > Sediment movement
Motion > Water motion > Water currents > Undercurrents > Western boundary undercurrents
Palaeo studies
Records > Analog records > Seismic profiles > Seismic reflection profiles
Sedimentation
Sediments
Topographic features > Submarine features > Ridges > Submarine ridges
Water > Bottom water
|
| Abstract | Detailed examination of 20,000 km of seismic reflection profiles and data on cores and abyssal currents suggests that the Greater Antilles Outer Ridge has been constructed by differential deposition of sediment from the Western Boundary Undercurrent above the seismic reflector, Horizon A. Deposition of acoustically stratified sediments under the eastern sector of the outer ridge was apparently terminated in the late middle Eocene when the incipient formation of the present Puerto Rico Trench cut off downslope sediment movement from the northeastern Antilles. At about the same time, the newly formed Western Boundary Undercurrent, possibly interacting with Antarctic Bottom Water entering from the South Atlantic, began to preferentially deposit acoustically transparent sediment to form the eastern outer ridge. Stratified sediments were deposited in the region of the present western outer ridge until the middle Miocene, when increased Antarctic Bottom Water flow apparently diverted the sediment-laden Western Boundary Undercurrent and produced a flow pattern which initiated deposition of the acoustically transparent sediment now forming the western ridge sector. Since that event, the resultant morphology of the Greater Antilles Outer Ridge has diverted the Western Boundary Undercurrent into a contour-following flow, causing further depositional construction of the entire outer ridge. * Present address: Lamont-Doherty Geological Observatory of Columbia University, Palisades, New York 10964. |
| Datasets (2) | - Flanders Marine Institute; Renard Centre of Marine Geology - Ugent (2018). Global contourite distribution database, version 2. Available online at https://www.marineregions.org, more
- Flanders Marine Institute; Renard Centre of Marine Geology - Ugent (2019). Global contourite distribution database, version 3. Available online at https://www.marineregions.org, more
|
|
