We use the model, together with measured magnesium concentration and δ 26 Mg profiles to quantify rates of net magnesium cycling and try and identify net magnesium sources and sinks in the sediment column and underlying crust.

Here, we produce a detailed global map of the flux of dissolved magnesium from the ocean into deeper marine sediments (greater than ∼ 1 meter below seafloor), and quantify the global flux and...

Here, we produce a detailed global map of the flux of dissolved magnesium from the ocean into deeper marine sediments (greater than ∼1 meter below seafloor), and quantify the global flux and associated isotopic fractionation.

The molar concentration of magnesium in sea-water is about five times that of calcium. In marine sediments magnesium carbonate is a con-stituent which varies in proportion according to the organic remains producing them (Olarke and Wheeler, 1922). It is a frequent constituent of shells, but much less abundant than calcium. The mode of formation

Magnesium in marine sediments is mainly partitioned among three components: 1) detrital phases derived from either primary mafic minerals/oxides or weathering products; 2) authigenic (in situ) clays; and 3) biogenic and abiogenic carbonates.