Diagenetic remobilization

Sinking particles transport trace elements to the sediments. Once in the sediments, chemical reactions can resolubilize a significant fraction of the particulate metals. This process is termed diagenetic remobilization and is the subject of the next chapter. The resolubilized elements can diffuse across the sediment-water interface into the deep zone. 

The Fe-Mn oxides that form from the diagenetic remobilization of sedimentary metals accrete at fester rates, on the order of himdreds of millimeters per million years. 

Diagenetic remobilization The solubilization of materials from sedimentary particles after their accumulation on the seafloor. 

Widerlund, A. (1996) Early diagenetic remobilization of copper in near-shore marine sediments A quantitative pore-water model. Mar. Chem. 54, 41-53. 

Kosehinsky et al. (1997) have also related differences in composition between the older and younger layers of Co-rich crasts to the expansion of the oxygen minimium zone during periods of phosphatization of the older crust layers which led to the diagenetic remobilization of certain elements within this layer of the crust. 

Concretions from Kiel Bay in the western Belt Sea occur in a narrow depth range of 20-28 m at the boundary between sands and mud in zones of active bottom currents. They occnr as coatings on molluscs and as spheroidal and discoidal concretions. The formation of the concretions is influenced by the development of summer anoxia which leads to the diagenetic remobilization and lateral transport of Mn. This accounts for the high Mn/Fe ratios of these concretions. 

In a marginal setting like the Saanich Inlet, changes in depositional characteristics of P have to be considered along with diagenetic remobilization of P. For example, how... 

Uranium is mostly microcrystalline uraninite pitchblende forms local tectonic or diagenetic remobilization. Pyrite is abundant other sulphides are present but are quantitatively subordinate to uraninite. Uranium mineralization is related to high Pb, Cu, V, Zn and As geochemical values. ... 

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