Radial dike formation on Venus: Insights from models of uplift, flexure and magmatism

Galgana, Gerald A.; Grosfils, E. B.; McGovern, P. J.

doi:10.1016/j.icarus.2013.04.020

Cited by 28 publications

(37 citation statements)

References 29 publications

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“…The shallow magma chamber (Figure f) shows a forebulge maximum at twice the edifice radius from the edifice axis with a distinguishable maximum, similar to Comer et al (), and the forebulge predicted for the deeper magma chamber is beyond the two‐radius limit with little bulge visible. We propose that a shallower magma chamber and/or a smaller T e produce a more pronounced forebulge since they have greater influence on the lithosphere upper boundary, which is consistent with the models of Grosfils (), Hurwitz et al (), Galgana et al (), and Galgana et al ().…”

Section: Discussionsupporting

confidence: 90%

“…This assumption is supported by comparing Figures d and e, which show two different volcanic scenarios each providing the same distance relationship. One scenario is EM (Comer et al, ), and the other, a volcano on Venus (Galgana et al, ) and in each case the region of maximum dilatational stress on the forebulge peak occurs at a distance, approximately equal to an edifice radius, from the edifice periphery as shown. It is suggested as unlikely that HT loading would be the primary cause for the creation of HTs and HTn graben.…”

Section: Discussionmentioning

confidence: 99%

“…(d) Rose frequency diagram of the NWSE graben occurring in the NW quadrant. (e) Details of the lithospheric forebulge profile modeled by Comer et al () for EM and (f) the lithospheric stress distribution for a Venusian volcano by Galgana et al () using a finite element model. It is noted that the forebulge for either model occurs at a similar distance from the edifice periphery, which is approximate to the edifice radius.…”

Section: Methodsmentioning

confidence: 99%

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Correlation Between Graben Orientation, Channel Direction Change, and Tectonic Loading: The Elysium Province, Mars

2019

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We have investigated the links between regional stress fields, the volcanic centers, rifts, graben, and channels in the NW region of the Elysium Province (Figures a and b) to determine whether the sequence of stress events occurring during province development can be derived from the morphologies of these features, and thus provide a sequence of development events, which is independent of surface dating techniques. Rift and graben geomorphology was mapped, and the neighboring relationships and orientation of individual graben were assessed to determine any spatial clustering or preferred orientation with regional or surface features capable of creating lithospheric flexure or tectonic stress within the study area. Crosscutting analysis determined a time ordered sequence of graben formation and these were related to volcanic centers or regional sources of stress. In addition, mapping showed that different channels share sections with similar shape and orientation, prompting our study of whether these channels, in tandem with the graben, were tectonically influenced during their development. The channel central axes were mapped and compared to identify common sequences of channel direction change. The time sequence of channel direction changes and the time‐ordered sequence of graben development were then compared. We have demonstrated a correlation between rift and graben direction with channel orientation suggesting a regional stress control from evolving volcanic centers. Overall we derive, for the first time, the temporal pattern of tectonic, volcanic, and channel evolution for the northwestern region of this major magmatic province on Mars.

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Section: Discussionsupporting

confidence: 90%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Correlation Between Graben Orientation, Channel Direction Change, and Tectonic Loading: The Elysium Province, Mars

2019

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“…Environmental conditions can be approximated in simplified numerical models, for example when modelling magma chamber growth the lithosphere may be modelled as a mechanically homogeneous material (e.g. Galgana et al, 2013) or by including mechanical heterogeneity and a stiffness contrast between crust and mantle (e.g. Le Corvec et al, 2015).…”

Section: Numerical Modelling Approachesmentioning

confidence: 99%

A review of laboratory and numerical modelling in volcanology

Kavanagh¹,

Engwell²,

Martin³

2018

Solid Earth

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Abstract. Modelling has been used in the study of volcanic systems for more than 100 years, building upon the approach first applied by Sir James Hall in 1815. Informed by observations of volcanological phenomena in nature, including eyewitness accounts of eruptions, geophysical or geodetic monitoring of active volcanoes, and geological analysis of ancient deposits, laboratory and numerical models have been used to describe and quantify volcanic and magmatic processes that span orders of magnitudes of time and space. We review the use of laboratory and numerical modelling in volcanological research, focussing on sub-surface and eruptive processes including the accretion and evolution of magma chambers, the propagation of sheet intrusions, the development of volcanic flows (lava flows, pyroclastic density currents, and lahars), volcanic plume formation, and ash dispersal.When first introduced into volcanology, laboratory experiments and numerical simulations marked a transition in approach from broadly qualitative to increasingly quantitative research. These methods are now widely used in volcanology to describe the physical and chemical behaviours that govern volcanic and magmatic systems. Creating simplified models of highly dynamical systems enables volcanologists to simulate and potentially predict the nature and impact of future eruptions. These tools have provided significant insights into many aspects of the volcanic plumbing system and eruptive processes. The largest scientific advances in volcanology have come from a multidisciplinary approach, applying developments in diverse fields such as engineering and computer science to study magmatic and volcanic phenomena. A global effort in the integration of laboratory and numerical volcano modelling is now required to tackle key problems in volcanology and points towards the importance of benchmarking exercises and the need for protocols to be developed so that models are routinely tested against "real world" data.

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“…Indeed, radiating graben-fissure systems can also be associated with large volcanoes (e.g. Keddie & Head 1994;Galgana et al 2013) or can occur individually, following rift zones (Grosfils & Head 1994;Aittola & Kostama 2000). The structures within radiating graben-fissure systems can extend for up to 2000 km.…”

Section: Volcanismmentioning

confidence: 99%

Volcanism and tectonism across the inner solar system: an overview

Platz

Byrne

Massironi

et al. 2014

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Volcanism and tectonism are the dominant endogenic means by which planetary surfaces change. This book, in general, and this overview, in particular, aim to encompass the broad range in character of volcanism, tectonism, faulting and associated interactions observed on planetary bodies across the inner solar system -a region that includes Mercury, Venus, Earth, the Moon, Mars and asteroids. The diversity and breadth of landforms produced by volcanic and tectonic processes are enormous, and vary across the inventory of inner solar system bodies. As a result, the selection of prevailing landforms and their underlying formational processes that are described and highlighted in this review are but a primer to the expansive field of planetary volcanism and tectonism. In addition to this extended introductory contribution, this Special Publication features 21 dedicated research articles about volcanic and tectonic processes manifest across the inner solar system. Those articles are summarized at the end of this review.

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Radial dike formation on Venus: Insights from models of uplift, flexure and magmatism

Cited by 28 publications

References 29 publications

Correlation Between Graben Orientation, Channel Direction Change, and Tectonic Loading: The Elysium Province, Mars

Correlation Between Graben Orientation, Channel Direction Change, and Tectonic Loading: The Elysium Province, Mars

A review of laboratory and numerical modelling in volcanology

Volcanism and tectonism across the inner solar system: an overview

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