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The saline organic-rich sediments: A short overview. Organicrich sediments (or 'sapropels') are complex organo-mineral matrices that form at the O2-depleted bottom of stagnant water basins. Besides geochemical transformations, slow rate microbially-driven processes underpin the early diagenesis of these sediments. The fossil sapropels found in various marine or lacustrine environments are known as proxies for past climate or hydrological fluctuations. Present-day organic-rich sediments havedoi:10.24193/awc2018_16 fatcat:4jr36ipquvfqzkxixrhc5egxte