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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Dyke-arrest scenarios in extensional regimes: Insights from field observations and numerical models, Santorini, Greece
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Dyke-arrest scenarios in extensional regimes: Insights from field observations and numerical models, Santorini, Greece

机译：在扩大政权中的堤防逮捕情景：野外观测和数值模型的见解，圣托里尼，希腊

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During a volcanic unrest period with magma-chamber rupture, fluid-driven fractures (dykes) are injected either from deep reservoirs or shallow magma chambers. Subsequently, the dykes follow propagation paths towards the surface, some eventually reaching the surface to erupt while others become arrested. Here we study dyke paths resulting in eruption or arrest in an excellent 5-km wide exposure of the northern caldera wall of the Santorini volcano in Greece. Mapping of 90 dyke segments shows that they were emplaced in a host rock consisting of layers (of breccia, tuff, scoria. and lava) with a wide variety of mechanical properties. At the contacts, some dykes are arrested or deflected and hence change their propagation paths. Here we combine the field data with numerical models to explore dyke paths resulting in (1) arrest and (2) eruption. We investigate the effect of different host-rock mechanical properties, magmatic overpressures, and tectonic loading on dyke paths. We find that layers with unfavorable local stresses for dyke propagation, namely stress barriers, result from layer stiffness (Young's modulus) contrast and thickness variations and are a common cause of dyke arrest. The study also shows how the details of the dyke path, and eventually dyke-fed eruptions, depend on the mechanical layering and local stresses in volcanoes. The results are of great importance for understanding dyke-propagation paths, and the likelihood of eruption, during unrest periods, particularly in stratovolcanoes fed by shallow chambers, such as Santorini. (C) 2020 Elsevier B.V. All rights reserved.
机译：在具有岩浆室破裂的火山动乱时期，流体驱动的骨折（Dykes）从深层储存器或浅岩浆室注入。随后，堤坝沿着朝向表面追随传播路径，有些最终达到表面爆发，而其他人被捕。在这里，我们研究了堤防路径，导致在希腊圣托里尼火山北部的火山口墙的优秀5公里宽敞的暴露中导致或逮捕。 > 90堤段的映射表明，它们被挖出在一个由各层（Breccia，Tuff，Scoria和Lava）组成的主体岩石中，具有各种机械性能。在触点处，一些堤坝被捕或偏转，因此改变了他们的传播路径。在这里，我们将现场数据与数值模型组合以探索堤防路径，导致（1）逮捕和（2）爆发。我们研究了不同宿主岩石力学性能，岩浆过压和构造载荷对堤防路径的影响。我们发现具有堤防传播的不利局部应力的层，即压力障碍，由层刚度（杨氏模量）对比度和厚度变化产生，并且是堤防逮捕的常见原因。该研究还表明了堤防路径和最终堤防爆发的细节如何取决于火山中的机械分层和局部应力。结果对于了解堤防 - 传播路径，以及在动乱时期的爆发的可能性非常重要，特别是在由浅腔室喂养的Stratovolcanoes，例如Santorini。 （c）2020 Elsevier B.v.保留所有权利。

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