sapropels
Sapropels are a type of organic-rich sediment that accumulate in anaerobic or oxygen-depleted aquatic environments, typically at the bottom of lakes, ponds, and sheltered marine areas. The term "sapropel" originates from the Greek words "sapros" (rotten) and "pelos" (mud), aptly describing their origin and nature. These sediments are characterized by a high content of organic matter, often exceeding 10-15%, derived from the decomposition of dead organisms such as algae, plankton, and aquatic plants.
The formation of sapropels is favored by conditions that limit the oxygen supply to the bottom layers
Sapropels play a significant role in the geochemical cycling of nutrients within aquatic ecosystems. Their high