The broken parts of lava flow that occur during its flow or solidification. If we look at only those parts, they are volcanic breccia. They can occur underground, but they are often formed on the surface, especially underwater, by internal flow after the surface solidifies. The autoclastic structure of underwater lava is often formed by rapid cooling and fracturing with water. [Kazuaki Nakamura] Source: Heibonsha World Encyclopedia, 2nd Edition Information |
溶岩流の流動中や固化時に生ずる破砕された部分。その部分だけ見れば火山角レキ岩である。地下でも生じうるが,地表,特に水底で表面固化後の内部の流動で生ずることが多い。水底溶岩の自破砕構造とよばれるものは水で急冷破砕されて生じたものが多い。【中村 一明】
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