…The metamorphosed spinel, silicate spinel, and silicate perovskite that appear during this phase transition are typical high-pressure minerals. Silicate spinel has actually been found in meteorites as a mineral of high-pressure origin caused by shock, and is called ringwoodite. On the other hand, pyroxene and garnet react at depths of about 200 km underground, gradually changing into minerals with a garnet structure of complex chemical composition, and finally transforming into the perovskite phase. … *Some of the terminology explanations that mention "ringwoodite" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…この相転移過程であらわれる変型スピネル,ケイ酸塩スピネル,ケイ酸塩ペロブスカイトは典型的な高圧鉱物である。ケイ酸塩スピネルは隕石中に衝撃高圧起源の鉱物として実際に見いだされ,リングウッダイトringwooditeという名称が与えられている。一方,輝石とザクロ石は地下約200km以深では反応して,しだいに複雑な化学組成のザクロ石構造の鉱物に変わり,最終的にはペロブスカイト相に転移する。… ※「ringwoodite」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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