volcanic cycle

Taking Mesozoic volcanic rocks in Eastern Fujian as an example, the authors put forward a new cartographic unit of volcanic terrains ( volcanic cycle, volcano tectonic element and lithofacies assemblage), in which the volcano tectonic element is a basic cartographic unit.

以福建省东部中生代火山岩为例，提出以火山旋回-火山构造单元-岩相（组合）作为火山岩区的三级填图单位，其中火山构造单元为基本的填图单位。

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The basic volcanic rocks of the first cycle belong to the alkali basalt magma series and those of the second and the third cycles the tholeiitic magma series.

第一旋回基性火山岩属碱性系列，第二、三旋回基性火山岩属拉斑玄武岩系列。

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Volcanic rocks of each cycle have their own features, reflecting different geneses.

不同旋回火山岩具有不同的地质、地球化学特征.

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This state is typically the last in the life cycle of an island, the first being volcanic and the second being an atoll.

珊瑚岛是岛屿形成过程中的第三个阶段。第一个阶段是火山活动形成岛屿，第二个阶段就是环礁岛。

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