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Sources of Deep Ocean-Basin Sediments, continued Chemical Deposits When substances that are dissolved in ocean water crystallize, these materials settle to the ocean floor as potato-shaped lumps of minerals called nodules. nodule a lump of minerals that is made of oxides of manganese, iron, copper, or nickel and that is found in scattered groups on the ocean floor Other minerals, such as phosphates, are also carried in the ocean floor before they crystallize and form mineral deposits on the ...
B. Biogenic sediments-Sediments in which the grains are formed by the action of a living organism. Shells, tests, and other hard parts secreted by organisms that fall to the bottom of the ocean and slowly accumulate. When the biogenic component makes up more than 30% of the sediment the sediment is called an ooze.. The thickest accumulations of sediments in the world are in the oceans. All but 8% of the world's sediment is in the ocean in piles up to 9 km thick. The thickest accumulation are on the continental slopes and rises.