...Salt domes have a variety of external shapes, from salt pillows, which indicate the early stages of growth, to mushroom-shaped salt plugs, to long, continuous salt walls, and their interiors have extremely complex structures as a result of the plastic flow of salt. Other types of diapirs besides salt domes include shale diapirs, granite diapirs, and gneiss domes, all of which are thought to be formed by density reversals occurring in the crust. There is also a view that emphasizes the role of mantle diapirs, which push up the bottom of the crust from below, as the cause of large-scale crustal movements. ... *Some of the terminology that mentions "gneiss dome" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…岩塩ドームの外形は,成長の初期段階を示す岩塩枕salt pillowといわれるものから,きのこ状に成長した岩塩プラグsalt plugや,長くつらなった岩塩壁salt wallなど多様なものがあり,その内部は岩塩の塑性流動の結果,きわめて複雑な構造となっている。岩塩ドーム以外のダイアピルとしては,ケツ岩ダイアピルshale diapir,花コウ岩ダイアピルgranite diapir,片麻岩ドームgneiss domeなどがあり,いずれも地殻中に発生する密度の逆転によって形成されるものと考えられている。また,大規模な地殻運動の原因として,下方から地殻の下底を突き上げるマントルダイアピルmantle diapirの役割を強調する考えもある。… ※「gneiss dome」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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