Chemical rocks
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Sedimentary rocks are formed by the chemical precipitation of dissolved substances in seawater, river water, lake water, hot spring water, etc. The precipitation mechanism of many rocks is unknown, except for evaporites such as halite and gypsum, and in many cases the action of microorganisms is thought to be involved. Examples include limestone, chert, gypsum, halite, and some sedimentary iron and manganese deposits. Source : Heibonsha Encyclopedia About MyPedia Information |
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海水，河水，湖水，温泉水などに溶解している物質が化学的に沈殿してできる堆積岩。岩塩，セッコウなどの蒸発岩以外は沈殿機構の不明なものが多く，また多くの場合微生物などの作用が関係していると考えられる。石灰岩，チャート，セッコウ，岩塩，堆積性の鉄やマンガン鉱床の一部など。
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