...些个含有钻石的片岩,路程经过火山发作穿越幢幢岩层达到地表,岩浆凝集后地层中便存留一条铅直的片岩柱,名叫火山柱(volcanic pipes)在已经往岁月中凝灰岩层连同火山柱上部都已经剥蚀而去,地层中的火山柱便是今天非洲南部遍地的钻石矿而那一些遭剥蚀的火山柱上部所...
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The diatreme breccia pipes belong to volcanic crater phase and volcanic conduit phase, and consist of breccias and binding material.
爆破角砾岩筒属火山口相和火山管道相，脉岩属次火山相。
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But Ragnarsson says Iceland's volcanic landscape is a world treasure and should not be criss-crossed with steam pipes and transmission lines or pocked with power plants.
NPR: Lured by Clean Energy, Industry Heads for Iceland
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