When a rock body has a special structure or shape, such as a dyke, a surrounding rock intruded by a vein, or a rock containing xenoliths, the matrix that surrounds it is generally called the host rock. Also, for certain rock-forming minerals, the rock that contains them is the host rock. Thus, the term host rock is used in a wide variety of situations, and there is no specific definition. [Mitsuo Hashimoto] Source: Shogakukan Encyclopedia Nipponica About Encyclopedia Nipponica Information | Legend |
岩脈、鉱脈などに貫かれた周囲の岩石、捕獲岩を包有する岩石など、岩石体の一部に特殊な構造や形態がある場合、それを囲む基質の部分を一般に母岩という。また、ある特定な造岩鉱物にとっては、それを含む岩石は母岩である。このように、母岩という用語はいろいろな場合に広く使われ、とくに定まった語義はない。 [橋本光男] 出典 小学館 日本大百科全書(ニッポニカ)日本大百科全書(ニッポニカ)について 情報 | 凡例 |
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