Pelagic sediments of biological origin containing more than 50% calcium carbonate. They cover nearly half of the entire ocean floor. They are divided into foraminiferal ooze and coccolith ooze. Calcareous ooze is mainly composed of plankton remains, so it tends to form in places where plankton proliferates and assimilates, reducing carbon dioxide and decreasing the solubility of calcium carbonate. This is thought to be the reason why calcareous ooze is common on the seafloor at depths of 2000 to 4000 meters in equatorial regions. (→ Soft ooze) Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
炭酸カルシウムを 50%以上含む生物起源の遠洋性堆積物。全海洋底の半分近くをおおう。有孔虫軟泥とコッコリス軟泥に分けられる。石灰質軟泥はプランクトンの遺骸を主とするので,プランクトンが繁殖し,その同化作用によって二酸化炭素が少くなって,炭酸カルシウムの溶解度が減少するところにできやすい。石灰質軟泥が,赤道地域の深さ 2000~4000mの海底に多いのは,この例とみられる。 (→軟泥 )
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