Sediments can be grouped into many categories among which we can find neritic/pelagic sediments, or according to the source. In the continental shelves, we can find neritic, lithogenous, and biogenous sediments.
Sediments can be either neritic or pelagic.
Neritic sediments are mostly lithogenous sediments, accumulated in relatively shallow waters near the coasts and the continental shelf.
The four main sources that produce marine sediments are,
(a) pre-existen rocks ⇒ lithogenous ⇒ from the land -river, wind, ice-
(b) organic matter ⇒ biogenous ⇒ organisms
(c) water dissolved compounds ⇒ hydrogenous
(d) material proceeding from the exterior space ⇒ cosmogenous
Neritic sediments are usually found on the coasts and continental shelf.
Lithogenous sediments- mainly sand and clay.
- transported by a river or by other parts of the shelve.
Biogenous sediments
- The carbonated skeleton of organisms and other particles.
- When no detrital sediments are deposited and there is a significant biological activity.
- The accumulation is due to algae and animals carrying calcareous shells.
- Carbonate sedimentation is also due to physicochemical processes.
Hence, in the continental shelves we can find neritic, lithogenous, and biogenous sediments.
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