火成岩の見かけの多様性 : 花崗岩の分布と岩相の特徴について

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書誌事項

タイトル別名
  • Apparent Diversity of Igneous Rocks : Distribution of the granitic rocks and characteristic of lithologies
  • カセイガン ノ ミカケ ノ タヨウセイ : ハナオカガン ノ ブンプ ト ガンソウ ノ トクチョウ ニ ツイテ

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抄録

In junior high school, the students learn to observe igneous rocks, including plutonic and volcanic rocks. Igneous rocks exemplified in the textbook are only those of typical specimens. However, rocks, either igneous, sedimentary or metamorphic rocks, observed in the field are sometimes weathered and show various lithologies. In order to make it possible to correctly identify igneous rocks, it is necessary to correctly recognize both their textures and structures and their rock-forming minerals, rather than to learn the rock name and its photo solely on a one-to-one basis. Taking granites as an example, introduced are: (a) the distribution of the main granite bodies observed in Western Japan; (b) their lithologies and (c) their formation ages.

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