首页> 外文期刊>Journal of Volcanology and Geothermal Research >Effect of slope on development of pahoehoe flow fields: Evidence from Mount Etna
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Effect of slope on development of pahoehoe flow fields: Evidence from Mount Etna

机译:坡度对Pahoehoe流场发展的影响:来自埃特纳火山的证据

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摘要

We describe and compare two types of pahoehoe on Mount Etna: one similar to an Hawaiian inflated flow field consisting of tumuli, lava rises and lava rise pits; and the other a coalescing complex of rootless centres of ephemeral boccas fed from lava tubes and superimposed on an initial 'a'a flow field. The former we define as a primary pahoehoe field that results from relatively slow advance rate of lava over an almost horizontal surface. The latter is a result of an eruption of long enough duration to allow tube formation over a substantial portion of the flow field over steeper slopes; at breaks in slope in the underlying topography centres of ephemeral boccas develop giving rise to low effusion rate pahoehoe lavas covering the original channelled 'a'a surface. These we refer to as secondary pahoehoe flow fields.
机译:我们描述并比较了埃特纳火山上的两种pa鱼:一种类似于夏威夷膨胀的流场,包括肿瘤,熔岩上升和熔岩上升坑。另一个是由熔岩管喂食并叠加在初始“ a”流场上的短命博卡斯无根中心的聚结复合体。我们将前者定义为主要的pahoehoe场,它是由熔岩在几乎水平的表面上相对较慢的推进速度所导致的。后者是由于喷发持续时间足够长而导致在陡峭的斜坡上流场的相当一部分上形成管子的结果。在短暂的古波卡斯(Bemcas)的下伏地貌中心的坡度折断处形成,导致低渗出率的覆盖在原始通道“ a” a上的泥hoe熔岩。我们称这些为次生的hoe回流场。

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