Novel interpretation for shift between eruptive styles in some volcanoes
Novel interpretation for shift between eruptive styles in some volcanoes
复制标题
对某些火山喷发类型转变的新颖解释
DOI：
10.1029/2005eo370001
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发表时间：
2005
期刊：
影响因子：
--
通讯作者：
P. Papale
中科院分区：
文献类型：
--
作者：
M. Polacci;M. Rosi;P. Landi;A. D. Muro;P. Papale
从低质量流率的喷溢转变为高质量流率的爆发是钙碱性火山活动的一个常见方面。然而，驱动两种喷发风格之间的转变的过程目前是有争议的，代表了火山学文献中的一个主题。
主要的挑战是要了解的机制，允许高质量流率时，喷发的高斑状（40体积%的晶体）和粘性岩浆（≥106帕秒，帕斯卡秒）发生。在这篇文章中，火山，成分和纹理的观察被用来证明，粘性耗散，一个过程，开发加热流动的岩浆在边界层附近的管道壁由于摩擦，是负责持久的，持续的爆炸阶段，这种喷发类型，以及从溢出到爆炸行为的过渡。
The transition from effusive, low mass flow rate to explosive, high mass flow rate eruptive behavior is a common aspect of the activity of calc-alkaline volcanoes. However, the process driving the shift between the two eruptive styles is at present debatable and represents a topical theme in the volcanological literature.
The main challenge is to understand the mechanism that allows a high mass flow rate when eruptions of highly porphyritic (40 vol % crystals) and viscous magmas (≥106 Pas, pascal second) occur. In this article, volcanological, compositional, and textural observations are used to demonstrate that viscous dissipation, a process that develops heating within flowing magma in a boundary layer near the conduit walls due to friction, is responsible for the long-lasting, sustained explosive phases of this eruption type, as well as for the transition from effusive to explosive behavior.