…the general term for the phenomena caused by magma during its generation, ascent, cooling, and solidification. Igneous activity is broadly divided into volcanism and plutonism. Volcanism is a phenomenon caused when underground magma or volcanic gases reach the earth's surface or near the surface, while plutonism is a phenomenon caused when underground magma intrudes into various parts of the earth's crust. *Some of the terminology that mentions "volcanism" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…マグマの発生からその上昇,冷却・固結にいたる間に,マグマによってひきおこされる現象の総称。火成作用は火山作用volcanismと深成作用plutonismに大別される。地下のマグマや火山ガスが地表または地表近くに達してひきおこす現象が火山作用であり,地下のマグマが地殻中のいろいろの場所に貫入してひきおこす現象が深成作用である。… ※「volcanism」について言及している用語解説の一部を掲載しています。 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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