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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Influence of angularities on magma tapping processes
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Influence of angularities on magma tapping processes

机译：角度对岩浆拍击过程的影响

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Basic principles controlling tensional failure of a solid are applied in this work to investigate the role played by angularities. The conditions explored apply equally to the initial rupture of sections of the walls of a magma chamber or reservoir and to the propagation of the leading edge of a three dimensional intrusion. The results show that even when the internal pressure inside a cavity might be uniform, the resulting stress on the material surrounding it can have contrastingly different values depending on its position relative to any angularities. Such variability explains why similar volumes of magma, trapped under similar conditions at depth and therefore having equivalent buoyancy, sometimes may feed a tapping event and fail to do so at other times. In addition, it can be appreciated why sometimes veins and dykelets only a few millimeters thick are formed whereas on other occasions it is possible to create a dyke several meters wide filled with magma of similar composition and intruding very similar country rock. The approach followed here also provides an alternative mechanism for the formation of blunt-ended dykes, and outlines the form in which those intrusions are likely to evolve under certain circumstances. (C) 2019 Elsevier B.V. All rights reserved.
机译：在这项工作中应用了控制固体拉伸破坏的基本原理来研究棱角所起的作用。探究的条件同样适用于岩浆室或储集层的壁的初始破裂，以及三维侵入体前缘的传播。结果表明，即使腔体内的内部压力可能均匀，取决于腔体相对于任何角度的位置，腔体周围材料上所产生的应力也可能具有相反的值。这种可变性解释了为什么在相似条件下在深处被困并因此具有相等浮力的相似体积的岩浆有时可能会注入轻敲事件而在其他时间却没有这样做。此外，可以理解为什么有时形成仅几毫米厚的脉和脉管，而在其他情况下，可能会创建几米宽的，堆积有相似成分的岩浆并侵入非常相似的乡村岩石的堤。此处采用的方法还提供了形成钝端堤坝的替代机制，并概述了在某些情况下这些入侵可能演变成的形式。 （C）2019 Elsevier B.V.保留所有权利。

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