Lithogenic silica
Lithogenic silica is silica that originates from terrestrial sources of rock and soil, i.e. from silicate minerals and crystals.
In the marine silicon cycle, LSi in the ocean is derived from rivers, eolian dust, hydrothermal vents, basalt weathering, and from benthic fluxes from the sediment into the ocean's interior.
LSi can either be accumulated "directly" in marine sediments or be transferred into dissolved silica in the water column.
