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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Volcano dynamics vs tectonics on Mars: evidence from Pavonis Mons
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Volcano dynamics vs tectonics on Mars: evidence from Pavonis Mons

机译：火山动力学与火星上的构造：来自Pavonis Mons的证据

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Volcanic activity is widespread within the inner Solar system and it can be commonly observed on rocky planets. In this work, we analyse the structures of Pavonis Mons in the Tharsis volcanic province of Mars by performing structural mapping, azimuth, and topographic distribution of linear features on the flanks of Pavonis, such as grabens and pit chains. We tested whether their formation is to be ascribed to the volcano dynamics and magmatic activity or the tectonics. Through the length size distribution and fractal clustering analyses of the structural features, we found that large grabens are vertically confined in the upper mechanical layers of the brittle crust whereas pit chains penetrate the whole crust up to the magmatic source, indicating that they can be considered the main feeders of Pavonis Mons. We inverted the topography with dykes and faults models to test whether grabens at the surface are the expression of intrusions at depth and we suggest that thin dykes inducing normal faulting are the most likely mechanism. Furthermore, two azimuthal distribution of the grabens are identified: concentric grabens occur on the volcano summit while linear grabens at its base show NE-SW trend as the Tharsis Mons volcanos alignment. The occurrence of linear grabens suggests that Pavonis likely experienced a phase of active rifting with the formation of such structures, followed by a phase of volcano growth and concentric magma intrusions when volcano and magma chamber dynamics prevailed. (c) 2020 Elsevier B.V. All rights reserved.
机译：火山活动在内阳系统内普及，并且可以在岩石行星上常见。在这项工作中，我们通过在Pavonis的侧翼上进行结构映射，方位角和线性特征的线性特征的地形分布来分析Pavonis Mons在火星省的Pavonis Mons的结构，例如Grabens和Pit链。我们测试了它们的形成是否要归因于火山动力学和魔法活动或构造。通过结构特征的长度尺寸分布和分形聚类分析，我们发现大量的Gablens在脆性地壳的上部机械层中垂直限制，而坑链渗透到岩浆源上的整个外壳，表明它们可以被考虑Pavonis Mons的主要饲养者。我们用Dykes和故障模型倒置了地形，测试了表面上的Grabrens是否是深度入侵的表达，我们建议诱导正常断层的薄染料是最可能的机制。此外，鉴定了两方四方分布的妊娠：在火山峰会上发生同心的grabens，而当Tharsis Mons Valcanos对准时，在其基地的线性Grablens的线性争夺。线性grabens的发生表明，Pavonis可能经历了这种结构的形成的活性裂化的相位，然后在火山和岩浆室动力学占上风时的火山生长和同心岩浆侵入的相位。 （c）2020 Elsevier B.v.保留所有权利。

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