What is the abundance of diatoms in a diatomite deposition?

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Ines Galović

When it has 70-90% of diatoms in diatomaceous earth.

Arindam Chakraborty

actually Sir I want to know that when we can tell the sediment is a diatomite, actually i am working in fossil diatoms and in one sequence we got a abundance of diatoms more than we usually find , so want to know the exact definition.

Andy Mitten

Diatom ooze - soft, silliceous, deep-sea deposit composed of more than 30% (by volume) diatom cell walls.

Ines why is there such a difference between the diatom content of diatom ooze and diatomaceous earth?

Also, which of these becomes a diatomite?

Diatom oozes belongs to deep pelagic sediments (more than 500 m depth) that are mostly characteristic for higher latitudes of oceans where diatoms deposits 2-10 mm/1000 years. Diatom oozes that are deposited in hemipelagial area (continental shelf, continental upwelling) where higher biogenic production of diatoms are more common and their accumulation in sediments as a pellets or marine snow could give diatomite or diatomaceous earth.

Andy, the perfect artical for you about diatomite is: D’Elia, C.F., Nelson, D.M. & Boynton, W.R. (1983): Chesapeake Bay nutrient plankton dynamics: 3.The annual cycle of dissolved silicon. Geoch. Cosmoch. Acta 47, 1945-1955.