Pyroclastic cone
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When volcanic activity is more intense than that of a maar and a large amount of volcanic ejecta is erupted, this accumulates around the crater and forms a cone. Depending on the constituent materials, they are classified as whitish, felsic, porous pumice cones, mafic, porous scoria cones, and cinder cones. The majority of cinder cones are scoria cones. Source: Asakura Publishing Dictionary of Petrology Information |
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火山活動がマールよりも激しく多量の本質放出物を噴出すると，火口の周囲にこれが堆積して円錐丘を作る．構成物質によって珪長質で多孔質な白っぽい軽石丘（pumice cone），苦鉄質で多孔質な暗色のスコリア丘（岩滓丘 : scoria cone），噴石丘（cinder cone）などが区別されている．噴石丘の大部分はスコリア丘である． 出典 朝倉書店岩石学辞典について 情報 |
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