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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Magma reservoir failure on the terrestrial planets: Assessing the importance of gravitational loading in simple elastic models
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Magma reservoir failure on the terrestrial planets: Assessing the importance of gravitational loading in simple elastic models

机译：陆地行星上的岩浆储层破坏：在简单弹性模型中评估重力载荷的重要性

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摘要

Results from a finite element model characterizing tensile rupture of an internally pressurized ellipsoidal magma reservoir within an axisymmetric elastic half space illustrate that gravity plays a critical role in this process. Failure to incorporate gravitational loading correctly, which is the case for most published models, affects for example: (a) application of corrections designed to account for the presence of the free surface in analytical models; (b) inferences about the internal pressure that a reservoir can sustain prior to rupture; (c) conclusions about the importance of neutral buoyancy, i.e. the relative host rock and magma density structures; and, (d) predictions about the location at which rupture of the reservoir wall will occur and the style of intrusion which will be favored. Analyses that reduce magma reservoirs to a cavity within an unloaded elastic medium, inflated by only an excess pressure component, sacrifice important information and should not be used to interpret reservoir activity or to calibrate more advanced models of volcanic regions and phenomena; an exception to this rule occurs, however, when constraining the pressure that can be inferred from surface displacements for a reservoir of known geometry. In a gravitationally loaded model, the characteristics of the failure process are insensitive to geologically plausible variations in the tensile strength, shear modulus, density structure and gravitational acceleration. As a result the half-space analysis presented here, which will benefit from future expansion to include topography and other factors, can yield insight into not only magma reservoirs on Earth but those thought to have formed within the crusts of Mars, Venus and other solar system bodies as well.
机译：表征轴对称弹性半空间内内部加压椭圆形岩浆储层拉伸破裂的有限元模型结果表明，重力在此过程中起着关键作用。大多数发表的模型都没有正确地吸收重力载荷，这会影响例如：（a）应用校正设计以考虑分析模型中自由表面的存在； （b）关于储层在破裂前可以承受的内部压力的推论； （c）关于中性浮力的重要性的结论，即相对的主体岩石和岩浆密度结构； （d）关于储层壁破裂发生位置的预测以及有利的侵入方式。使岩浆储层减少到空载弹性介质中的空腔，仅由过大压力分量膨胀的分析，会牺牲重要信息，因此不应用于解释储层活动或校准更高级的火山区和现象模型；但是，当限制可从已知几何形状的储层的表面位移推断出的压力时，会出现此规则的例外情况。在重力加载模型中，破坏过程的特征对拉伸强度，剪切模量，密度结构和重力加速度的地质上合理的变化不敏感。结果，本文介绍的半空间分析将受益于未来的扩展，包括地形和其他因素，不仅可以洞悉地球上的岩浆储层，而且还可以洞悉那些在火星，金星和其他太阳壳中形成的岩浆储层。系统主体。

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