1. Submarine Canyons: These are deep, V-shaped valleys that cut into the continental shelf and slope. Turbidity currents carve these canyons by eroding the sediment and rock along their path. They often have a dendritic pattern, similar to rivers on land.
2. Fan Deltas: At the base of submarine canyons, turbidity currents deposit their sediment load, creating fan-shaped features called fan deltas. These deposits consist of graded bedding, with coarser material at the base and finer material towards the top.
3. Turbidite Deposits: These are layers of sediment deposited by turbidity currents. They are characterized by a distinctive "Bouma sequence," a pattern of five layers:
* A: A layer of coarse, poorly sorted sediment, often containing clasts of rock.
* B: A layer of graded bedding, with coarser grains at the base and finer grains at the top.
* C: A layer of parallel-laminated sediment, indicating slower flow conditions.
* D: A layer of ripple-laminated sediment, indicating even slower flow conditions.
* E: A layer of pelagic mud, deposited after the current has dissipated.
4. Submarine Channels: These are narrow, elongated depressions on the seafloor, often formed by the erosive power of turbidity currents. They can be straight, sinuous, or branching, and they typically connect submarine canyons to fan deltas.
5. Sediment Waves: These are elongated ridges and troughs on the seafloor, formed by the deposition of sediment by turbidity currents. They can be large and widespread, and they can be a significant hazard for submarine pipelines and cables.
6. Contourites: These are sediment deposits that accumulate on the seafloor due to the interaction of turbidity currents with bottom currents. They are often found on continental slopes and rises, and they can be characterized by their distinctive internal structure and the presence of graded bedding.
7. Turbidite Fans: These are large, fan-shaped accumulations of sediment deposited by turbidity currents. They can cover vast areas of the seafloor, and they are often associated with submarine canyons and channels.
8. Submarine Slumps and Slides: Turbidity currents can also trigger these features, which involve the rapid movement of sediment down slopes. Slumps and slides can create distinctive scarps and terraces on the seafloor, and they can also generate tsunamis.
In addition to these features, turbidity currents can also play a role in the transportation of sediment, nutrients, and organic matter throughout the ocean. Their impact on the seafloor is significant and widespread, shaping the ocean's topography and influencing marine ecosystems.
