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1·Two hundred years ago, Ascension Island was a barren volcanic edifice.

两百年前，阿森松岛是一个贫瘠的火山结构残迹。

2·The metallization is controlled by the Permian volcanic lithofacies and volcanic edifice.

其成矿作用主要受二叠纪火山岩相及火山机构控制。

3·Volcanic edifice is divided into three facies belts which are crater-near crater facies (CNCF), proximal facies (PF) and distal facies (DF).

将火山机构分为火山口-近火山口相(CNCF)、近源相(PF)和远源相(df)三个相带。