… Peridotites that exhibit the latter two occurrences are rocks that make up the upper part of the upper mantle (depth 35-900 km) and are important in studying the internal structure of the Earth. Those that occur in orogenic and tectonic belts are called Alpine type, and are divided into the harzburgite-lherzolite group that makes up the lowermost part of the ophiolite, and the lherzolite group that occurs as lenticular bodies in high-temperature metamorphic belts. The former are considered to be rocks that make up the uppermost part of the upper mantle in oceanic regions. … *Some of the terminology that refers to the "Alpine type" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
… 後の二つの産状を示すカンラン岩は,上部マントル(深さ35~900km)の上部を構成する岩石であり,地球の内部構造を研究する上で重要である。造山帯や構造帯に産するものはアルパイン型と呼ばれ,オフィオライト最下部を構成するハルツバージャイト・レルゾライト・グループと,高温型変成帯にレンズ状岩体として産するレルゾライト・グループに分けられる。前者は海洋地域の上部マントル最上部を構成している岩石とみなされている。… ※「アルパイン型」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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