A Global Survey of Lithospheric Flexure at Steep-Sided Domical Volcanoes on Venus Reveals Intermediate Elastic Thicknesses

Borrelli, M. E.; O’Rourke, J. G.; Smrekar, S. E.; Ostberg, Colby

doi:10.1002/essoar.10504581.1

Cited by 2 publications

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References 25 publications

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“…Gravity and topography studies of Venusian volcanic rises, including Atla, Bell and Eistla regiones, lead to heat flows estimations of 21–35 mW m −2 (Phillips et al., 1997), which are very similar to our results for Alpha Regio. In addition, flexural studies based on topography data indicate that coronae are associated with major heat flow anomalies, reaching up to ∼100 mW m −2 (O’Rourke & Smrekar, 2018; Russell & Johnson, 2021), while steep‐sided domes are associated with regional heat flows of 40 mW m −2 (Borrelli et al., 2021).…”

Section: Discussionmentioning

confidence: 99%

Lithospheric Structure of Venusian Crustal Plateaus

Maia

Wieczorek

2022

JGR Planets

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Crustal plateaus, also called plateau highlands, are prominent geologic features on Venus, with roughly circular planforms and diameters ranging from 1,500 to 2,500 km. They present a steep-sided topography reaching 2-4 km of altitude above the surrounding plains, with the highest elevations generally closer to the margins. The surface of the plateaus is dominated by tessera terrains, that are characterized by complex tectonic fabrics which indicate multiple stages of deformation recording both extensional and contractional events (e.g., Bindschadler,

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Section: Discussionmentioning

confidence: 99%

Lithospheric Structure of Venusian Crustal Plateaus

Maia

Wieczorek

2022

JGR Planets

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“…Of these, about 13 (some are grouped or adjacent to each other) are within 1.5 corona radii of a corona and are covered by the stereo topography used in this study (Figure and ). We focused our study on tholi on/near coronae rather than conducting a global survey of tholi in any setting (e.g., Borrelli et al., 2021; Russell & Johnson, 2019), so that as for Narina Tholus, we could include any information on relative timing of the tholi emplacement in the corona evolution in interpreting possible flexural signatures (Supplemental Information, Text and Figures and ).…”

Section: Discussionmentioning

confidence: 99%

Evidence for a Locally Thinned Lithosphere Associated With Recent Volcanism at Aramaiti Corona, Venus

Russell

Johnson

2021

JGR Planets

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Heat flow estimates of terrestrial planets and icy satellites are important for exploring their thermal evolution. Topographic signatures of flexure can be used to estimate the effective elastic lithospheric thickness, he, and heat flow. Here, we use high resolution stereo topography and axisymmetric elastic flexure models to investigate lithospheric flexure around Narina Tholus, a steep‐sided volcanic dome ∼40 km across that superposes the tectonic annulus of Aramaiti Corona. Our results indicate a best‐fit elastic thickness he = 3.9–9.1 km, for values of Young's modulus, E, ranging from 65 to 5 GPa respectively. This suggests a thinned lithosphere locally around Narina Tholus, compared to regional estimates for he. The lower values of E are appropriate to the heavily fractured environment of the corona annulus, and we find that they predict flexural stresses compatible with the limited fracturing observed around Narina Tholus. A global survey yielded 13 additional tholi (or tholi groups) at coronae and with stereo coverage, none of which showed evidence for flexure. We find, that locally at Narina Tholus, the heat flow is elevated by a factor of 2–4 relative to that inferred from a previous study of flexure at Aramaiti, consistent with late‐stage, possibly recent, volcanism focused at, and facilitated by, the fracture annulus. Our results further strengthen arguments for a currently volcanically active planet and demonstrate the role that high‐resolution stereo topography can play in elucidating the current thermal state of Venus.

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A Global Survey of Lithospheric Flexure at Steep-Sided Domical Volcanoes on Venus Reveals Intermediate Elastic Thicknesses

Cited by 2 publications

References 25 publications

Lithospheric Structure of Venusian Crustal Plateaus

Lithospheric Structure of Venusian Crustal Plateaus

Evidence for a Locally Thinned Lithosphere Associated With Recent Volcanism at Aramaiti Corona, Venus

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