Biological Control on Diagenesis: Influence of Bacteria and Relevance to Ocean Acidification
Soon after carbonate mineral particles are deposited, a series of chemical, physical, and biological processes start that can significantly alter their mineralogy, isotopic composition and chemistry, and the fabric of the accumulating sediment. These processes include dissolution and precipitation reactions, abrasion, and transport, and ingestion and boring by organisms. The processes occurring after deposition fall into the category of diagenesis. In particular, carbonate sediments consisting of the minerals low (<4 mol% MgCO3) and high (>4 mol% MgCO3) biogenic and inorganic magnesian calcite and aragonite and organic matter deposited in shallow waters are repeatedly deposited, resuspended, and then deposited again during periods of elevated turbulence, which are common especially during storms. Consequently, carbonate minerals may be subjected to several depositional environments before being permanently buried in a sediment. The study of carbonate diagenesis is further...
KeywordsFermentation Sulfide Phytoplankton Calcite Pyrite
This work was supported by the US National Science Foundation grant OCE-0749401.
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