Abstract
In an East Mediterranean marine core, the upper sapropel begins soon after the start of a global event—a very heavy precipitation which occurred in the equatorial latitudes during the late Glacial–early Holocene. This heavy precipitation in Africa, channelled by the Nile River across 35° of latitude, produced a low-salinity surface layer in the East Mediterranean. In this confined basin, with high bottom salinity, the steep salinity gradient stratified the water column. The stagnant bottom waters triggered the sapropel formation. Cretaceous sapropels in the tropical oceans may result from the same chain of events in warm, humid climates, with contrasting wet-and-dry seasonal rhythm.
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Rossignol-Strick, M., Nesteroff, W., Olive, P. et al. After the deluge: Mediterranean stagnation and sapropel formation. Nature 295, 105–110 (1982). https://doi.org/10.1038/295105a0
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DOI: https://doi.org/10.1038/295105a0
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