A type of marine sediment. Sediments that contain more than 30% by weight of the remains of living organisms are called ooze, and are broadly classified into siliceous ooze and calcareous ooze depending on their composition. Here, siliceous means that it does not contain quartz (crystalline silica SiO 2 , mainly terrestrial), but contains a lot of amorphous silica (opalescent silica SiO 2 ・ n H 2 O) that contains water molecules, which make up living organisms. Organisms that extract silica from seawater to create opalescent silica shells, whose shells are preserved in sediments, are diatoms, radiolarians, siliceous flagellates, and sponges. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
海洋堆積物の一種。生物の遺骸を重量の30%以上含む堆積物を軟泥oozeと呼び,その成分によりケイ質軟泥と石灰質軟泥に大別される。ここでケイ質とは,石英(結晶質シリカSiO2,おもに陸源)ではなくて,生物体を構成する,水分子を持つ非晶質シリカ(オパール質シリカSiO2・nH2O)を多く含むという意味である。海水中からシリカを抽出してオパール質シリカの殻をつくり,その死殻が堆積物中に保存される生物はケイ藻,放散虫,ケイ質鞭毛藻とカイメンである。
出典 株式会社平凡社世界大百科事典 第2版について 情報 |
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