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1. (Geological Science) of, relating to, or containing abundant silica: siliceous deposits; a siliceous clay. 2. (Botany) (of plants) growing in or needing soil rich in silica.
Siliceous ooze accumulates on the ocean floor where the bottom waters are close to saturation with respect to silica, and the opaline remains of either diatoms, radiolarians, silicoflagellates, and sponge spicules, or combinations of these are rapidly buried.hese conditions exist within areas of high biological productivity associated with volcanic islands and nutrient-rich upwelling zones. As the least common type of pelagic sediment, it covers only 15% of the ocean floor. It accumulates at a slower rate than calcareous ooze: 0.2â1 cm / 1000 yr.