An Archean basic layered intrusion in Zimbabwe, southeastern Africa. It is 3-12 km wide and extends 480 km from north-northeast to south-southwest, and is so named because it looks like a huge dike on a geological map. It was formed when basic magma intruded into a large graben depression, and has an overall boat-like structure. In other words, the rocks become thicker from the east and west toward the center in the width direction, and also from the north and south toward the center in the length direction. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
アフリカ南東部,ジンバブウェにある始生代の塩基性層状貫入岩体。幅3~12km,北北東~南南西方向に480km延長し,地質図上ではあたかも巨大な岩脈(ダイク)にみえるのでこの名がある。大規模な地溝状凹地に,塩基性マグマが逬入してきたもので,全体としてボート状の構造をもつ。すなわち横幅方向では,東および西から中央部へ向かって岩体が厚くなり,また縦延長方向でも,北および南から中央部へ向かって岩体が厚くなる。
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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