Geologic map of the Hecate Chasma quadrangle (V-28), Venus

Stofan, E. R.; Guest, J. E.; Brian, A. W.

doi:10.3133/sim3163

Cited by 4 publications

(3 citation statements)

References 59 publications

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“…Aruru Corona is an asymmetric, rimmed plateau corona located in the Hecate Chasma quadrangle (V‐28). Volcanic materials associated with Aruru Corona extend radially in the form of digitate and sheet‐like emplacements (Stofan et al., 2012). These extra‐annulus flows may have sources on the flanks of the corona, but exact edifices are not resolvable.…”

Section: Introductionmentioning

confidence: 99%

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Evidence of Topographic Change Recorded by Lava Flows at Atete and Aruru Coronae on Venus

Tucker,

Dombard

2023

JGR Planets

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Coronae are quasi‐circular volcano‐tectonic features on Venus. Four critical observations have been identified within the coronae population, including fracture annuli, a wide range of diameters, complex and varied topography, and various types of associated volcanic features. Geophysical models have attempted to replicate their formation from a variety of lithospheric processes but struggle to recreate all four of the critical observations. Volcanism is an often overlooked characteristic in corona formation models. Paleotopographic techniques are applied to lava flows associated with Atete Corona and Aruru Corona in the Beta‐Atla‐Themis region to investigate post‐emplacement changes in topography. Our results indicate marked divergence between lava flow orientation and the modern slope within the fracture annuli of the coronae. Intra‐annular flows at Atete Corona were emplaced on a surface that was reoriented by up to ∼180°. Intra‐annular flows at Aruru Corona were emplaced on a surface that was reoriented between 90° and 145°. Lava flows on the flanks of both coronae diverge less than those within the fractures. This finding suggests a progression of volcanism that starts at the interior of the corona and migrates outward to the fracture annuli. The role of volcanism, both intrusive and extrusive, is likely to play a more substantial role in the corona formation. Incorporating melt migration into geophysical models could significantly enhance our comprehension of the processes underlying the formation of coronae.

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Section: Introductionmentioning

confidence: 99%

“…However, there is little relative age information regarding the volcanic events in the region, which comes from the flows farthest from their sources, providing limited observational evidence. Therefore, it is possible that the features of this region formed concurrently (Stofan et al., 2012).…”

Section: Introductionmentioning

confidence: 99%

Evidence of Topographic Change Recorded by Lava Flows at Atete and Aruru Coronae on Venus

Tucker,

Dombard

2023

JGR Planets

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“…Building on this view of Venus, numerous geodynamic modeling efforts assume that Venus is a single-plate planet with a stagnant lithospheric lid and scant record of tangible tectonic events (e.g., Armann & Tackley, 2012;Gillmann & Tackley, 2014;Moore et al, 2017;Taylor & Grinspoon, 2009;Turcotte et al, 1999). However, a number of other geologic maps provide a different view documenting both a diversity and relative high density of secondary structures (e.g., Bannister& Hansen, 2010;Bleamaster & Hansen, 2005;Bridges & McGill, 2002;Chapman, 1999;Dohm et al, 2011;Hansen, 2009;Hansen & DeShon, 2002;Kumar & Head, 2013;Stofan et al, 2012;Young & Hansen, 2003). The structural relationships depicted on these maps indicate that Venus preserves a significant tectonic record, providing evidence of changing operative tectonic processes overtime.…”

Section: Introductionmentioning

confidence: 99%

Mapping of Geologic Structures in the Niobe‐Aphrodite Map Area of Venus: Unraveling the History of Tectonic Regime Change

Hansen

López

2018

JGR Planets

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Recent construction of 1:10 M IMaps of Niobe Planitia and Aphrodite Terra paints a rich picture of Venus evolution. Using the Niobe‐Aphrodite map area (>25% of Venus) as an example, we illustrate the methodology and importance of detailed structural mapping at large regional scales in order to identify tectonic domains that lead to the discovery of global‐scale geodynamic evolution and operative processes. We highlight differences between lithodemic and lithostratigraphic units in geologic mapping. We step through a series of structural element maps that reveal the character of at least three different tectonic domains and evolving tectonic regimes that reflect changing geodynamic processes, here divided into three eras. The ancient era encompasses formation of tessera terrain and represents a time of unique global and environmental conditions marked by globally thin lithosphere. The second era resulted in formation of the Artemis superstructure. The ~13,000‐km‐diameter footprint of the Artemis superstructure is huge but not global, although associated mantle flow patterns could have had a global reach. As formation of the Artemis superstructure waned, tectonic activity became more focused leading to formation of the fracture zone complex. This complex extends beyond the map area connecting with Atla, Beta, and Themis regiones and associated fracture zones, marking the youngest era. Structural mapping of the Niobe‐Aphrodite map area indicates that Venus exhibits a complex, multistage history like other terrestrial planets, which probably extends to several billion years. Given that Venus never developed plate tectonics, Venus' preserved surface record is likely significantly richer than that of Earth.

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Global Stratigraphy and Resurfacing History of Venus

Иванов

Head

2023

Advances in Geochemistry, Analytical Chemistry, and Planetary Sciences

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Geologic map of the Hecate Chasma quadrangle (V-28), Venus

Cited by 4 publications

References 59 publications

Evidence of Topographic Change Recorded by Lava Flows at Atete and Aruru Coronae on Venus

Evidence of Topographic Change Recorded by Lava Flows at Atete and Aruru Coronae on Venus

Mapping of Geologic Structures in the Niobe‐Aphrodite Map Area of Venus: Unraveling the History of Tectonic Regime Change

Global Stratigraphy and Resurfacing History of Venus

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