Resurfacing History and Volcanic Activity of Venus

Space Science Reviews, Год журнала: 2023, Номер 219(4)

Опубликована: Апрель 25, 2023

Abstract Photogeologic principles can be used to suggest possible sequences of events that result in the present planetary surface. The most common method evaluating absolute age a surface remotely is count number impact craters have occurred after formed, with assumption occur spatially random fashion over time. Using additional assumptions, been partially modified by later geologic activity assess time frames for an interpreted sequence events. total on Venus low and spatial distribution taken itself nearly indistinguishable from random. overall implication Venusian much closer Earth its youthfulness than other, smaller inner solar system bodies. There are differing interpretations extent which volcanism tectonics regional global Consequently, spectrum resurfacing views has emerged. These range planet evolved limited current concentrated few zones Earth-like levels occurring everywhere at similar rates but different ways. Analyses record provided observations challenging reconcile either endmember views. interpretation evolution nature relies assumptions challenged, there other areally extensive short-lived features such as canali view regions evolving independently. Future data, especially high-resolution imaging topography, provide details resolve some issues. global-evolution viewpoints must tie assessments present-day volcanic tectonic made data upcoming missions.

Язык: Английский

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Magma Ocean, Water, and the Early Atmosphere of Venus

Space Science Reviews, Год журнала: 2023, Номер 219(7)

Опубликована: Сен. 20, 2023

Abstract The current state and surface conditions of the Earth its twin planet Venus are drastically different. Whether these differences directly inherited from earliest stages planetary evolution, when interior was molten, or arose later during long-term evolution is still unclear. Yet, it clear that water, abundance, state, distribution between different reservoirs, which intimately related to solidification outgassing early magma ocean, key components regarding past present-day habitability, pathways leading various conditions. In this chapter we start by reviewing outcomes accretion sequence, with particular emphasis on sources timing water delivery in light available constraints, initial thermal at end main accretion. Then, detail processes play thermo-chemical molten terrestrial planets, how they can affect abundance within reservoirs. Namely, focus ocean cooling, solidification, concurrent formation outgassed atmosphere. Accounting for possible range parameters based mechanisms feedbacks described, provide an overview likely evolutionary diverse conditions, a temperate hellish Venus. implications resulting habitability discussed context subsequent atmospheric evolution. Future research directions observations proposed constrain scenarios order reconcile Venus’ while deciphering path followed.

Язык: Английский

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Volcanic and Tectonic Constraints on the Evolution of Venus

Space Science Reviews, Год журнала: 2024, Номер 220(4)

Опубликована: Апрель 29, 2024

Abstract Surface geologic features form a detailed record of Venus’ evolution. Venus displays profusion volcanic and tectonics features, including both familiar exotic forms. One challenge to assessing the role these in evolution is that there are too few impact craters permit age dates for specific or regions. Similarly, without surface water, erosion limited cannot be used evaluate age. These same observations indicate has, on average, very young (150–1000 Ma), with most recent deformation volcanism largely preserved except where covered by ejecta. In contrast, activity Mars, Moon, Mercury occurred 1st billion years. Earth’s processes almost all result plate tectonics. lacks such network connected, large scale plates, leaving nature dominant geodynamic process up debate. this review article, we describe key tectonic models their origin, possible links We also present current knowledge composition thickness crust, lithospheric thickness, heat flow given critical shaping geology interior Given hot lithosphere, abundant potential analogues continents, roll-back subduction, microplates, it may provide insights into early Earth, prior onset true explore similarities differences between Proterozoic Archean Earth. Finally, future measurements needed advance our understanding volcanism, tectonism, Venus.

Язык: Английский

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Venus, the Planet: Introduction to the Evolution of Earth’s Sister Planet

Space Science Reviews, Год журнала: 2023, Номер 219(1)

Опубликована: Фев. 1, 2023

Abstract Venus is the planet in Solar System most similar to Earth terms of size and (probably) bulk composition. Until mid-20th century, scientists thought that was a verdant world—inspiring science-fictional stories heroes battling megafauna sprawling jungles. At start Space Age, people learned actually has hellish surface, baked by greenhouse effect under thick, CO 2 -rich atmosphere. In popular culture, demoted from jungly playground (at best) metaphor for redemptive potential extreme adversity. However, whether much different past than it today remains unknown. this review, we show how now-popular models evolution mirror scientific understanding modern changed over time. Billions years ago, could have had clement surface with water oceans. perhaps then underwent at least one dramatic transition atmospheric, interior conditions before present day. This review kicks off topical collection about all aspects Venus’s can teach us other planets, including exoplanets. Here provide general background motivation required delve into manuscripts collection. Finally, discuss our ignorance motivated prioritization new spacecraft missions will rediscover Earth’s nearest planetary neighbor—beginning age exploration.

Язык: Английский

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Venus Evolution Through Time: Key Science Questions, Selected Mission Concepts and Future Investigations

Space Science Reviews, Год журнала: 2023, Номер 219(7)

Опубликована: Окт. 1, 2023

Abstract In this work we discuss various selected mission concepts addressing Venus evolution through time. More specifically, address investigations and payload instrument supporting scientific goals open questions presented in the companion articles of volume. Also included are their related (observations & modeling) discussion which measurements future data products needed to better constrain Venus’ atmosphere, climate, surface, interior habitability A new fleet missions has been selected, will continue be considered for selections. Missions under development include radar-equipped ESA-led EnVision M5 orbiter (European Space Agency 2021), NASA-JPL’s VERITAS (Smrekar et al. 2022a), NASA-GSFC’s DAVINCI entry probe/flyby (Garvin 2022a). The acquired with VERITAS, DAVINCI, from end decade fundamentally improve our understanding planet’s long term history, current activity evolutionary path. We further describe beyond framework missions, as well synergies between these concepts, ground-based space-based observatories facilities, laboratory measurements, algorithmic or modeling activities that pave way a program extends into 2040s (Wilson 2022).

Язык: Английский

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The Habitability of Venus

Space Science Reviews, Год журнала: 2023, Номер 219(2)

Опубликована: Фев. 22, 2023

Abstract Venus today is inhospitable at the surface, its average temperature of 750 K being incompatible to existence life as we know it. However, potential for past surface habitability and upper atmosphere (cloud) present day hotly debated, ongoing discussion regarding a possible phosphine signature coming from clouds shows. We review current understanding about evolution with special attention scenarios where planet may have been capable hosting microbial life. compare possibility on case Earth by reviewing various hypotheses put forth concerning origin habitable conditions emergence plate tectonics both planets. Life emerged during Hadean when was dominated higher mantle temperatures (by $200~^{\circ}\text{C}$ 200∘C ), an uncertain tectonic regime that likely included squishy lid/plume-lid tectonics, proto continents. Despite lack well-preserved crust dating Paleoarchean, attempt environmental this critical period based zircon crystals geochemical signatures period, well studies younger, relatively rocks Paleoarchean. For these early, primitive forms, not but it became important means nutrient recycling, consequences global environment in long-term, essential continuation early Venus, question stable water closely related tectonics. discuss transitions between stagnant lid (episodic) crustal volatile cycling Venus’ interior atmosphere. In particular, insights into climate examine questions rotation speed, reflective clouds, silicate weathering, summarize implications long-term habitability. Finally, state knowledge Venusian proposed detection covered.

Язык: Английский

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Synergies Between Venus & Exoplanetary Observations

Space Science Reviews, Год журнала: 2023, Номер 219(1)

Опубликована: Фев. 1, 2023

In this chapter we examine how our knowledge of present day Venus can inform terrestrial exoplanetary science and study Venus. a superficial way the contrasts in appear stark. We have been looking at for millennia studying it via telescopic observations centuries. Spacecraft began with Mariner 2 1962 when confirmed that was hothouse planet, rather than tropical paradise fiction pictured. As long as level exploration understanding remains far below Mars, major questions will endure. On other hand, has grown leaps bounds since discovery Pegasus 51b 1995, not too after golden years spacecraft missions came to an end Magellan Mission 1994. Multi-million billion dollar/euro exoplanet focused such JWST, its successors be flown coming decades. At same time, excitement about is blooming again number proposed decades from India, Russia, Japan, European Space Agency National Aeronautics Administration. chapter, review what known may discover tomorrow complementary studies cousins.

Язык: Английский

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The tectonics and volcanism of Venus: New modes facilitated by realistic crustal rheology and intrusive magmatism

Icarus, Год журнала: 2023, Номер 399, С. 115539 - 115539

Опубликована: Март 28, 2023

To explain Venus' young surface age and lack of plate tectonics, tectonic regime has often been proposed to be either an episodic-lid with global lithospheric overturns, or equilibrium resurfacing numerous volcanic activities. Stratigraphic analysis suggests that tectonics could a combination these two end-member models event created most the crust followed by activities until now. Recent analyses satellite images also suggest widespread mobility in lowland basins does not fit regime. Here, we use 2-D thermochemical convection realistic parameters, including rheology (dislocation creep, diffusion plastic yielding), experiment-based plagioclase (An75) crustal rheology, intrusive magmatism, investigate mantle evolution Venus. We find is strongly affected rheology. With "weak" plagioclase-rheology crust, exhibit episodic overturns but continuously high distributed strain rates between leading new name "deformable lid". On other hand, olivine-crustal-rheology standard i.e. during near zero stagnant-lid near-zero over entire model time. In magmatic resurfacings are short-lived randomly located, rather uniform rate. Also, dislocation creep can weaken lithosphere sufficiently facilitate without applying yielding. Internally, composition-dependent density profile results "basalt barrier" at transition zone, which affects evolution. Only strong plumes penetrate this basalt barrier cause overturns. This causes internal generate models, mechanism involve "stagnant episodic-volcanic-resurfacing". Results low eruption efficiencies best current estimates thickness, age, structures based on observations The thickness olivine-rheology limited basalt–eclogite phase higher than observation-based estimates. Higher intrusion better estimates, as efficiency predict very (< 100 Myr).

Язык: Английский

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The punctuated evolution of the Venusian atmosphere from a transition in mantle convective style and volcanic outgassing

Science Advances, Год журнала: 2025, Номер 11(2)

Опубликована: Янв. 10, 2025

A key question in the planetary sciences centers on divergence between sibling planets, Venus and Earth. currently does not operate with plate tectonics, its thick atmosphere has led to extreme greenhouse conditions. It is unknown if this state was set primordially or once more Earth-like. Here, we explore as an example of a planet that recently transitioned tectonic regimes. Our results show transitions naturally lead substantial resurfacing melt-generated outgassing from lithosphere-breaking events overturns, 3 10 bars generated per overturn over ~60–million year timescales ~10 100 outgassed billion-year time frames. We find observation inferences low volcanic rates previous prodigious are consistent undergone transition suggesting hosted clement surface conditions

Язык: Английский

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Dyke swarms record the plume stage evolution of the Atla Regio superplume on Venus

Communications Earth & Environment, Год журнала: 2023, Номер 4(1)

Опубликована: Июль 3, 2023

Abstract Atla Regio, Venus, is interpreted as a young major mantle plume centre, and we address whether it at head or tail stage. Our approach uses graben-fissure lineaments, the surface expression of dykes. Mapping > 40,000 such lineaments reveals giant radiating dyke swarms associated with volcanic centres Maat (>1500 km swarm radius), Ozza (>2000 km), Ongwuti (>1100 km) Unnamed montes indicating that each due to magmatism rather than (maximum length ~ 100 km). The size an underlying flattened estimated by radius where transitions from linear pattern. All four their heads group within 1200 Mons head, consistent single event. Regio stage coeval triple-junction rifting, which on Earth would typically precede attempted continental breakup.

Язык: Английский

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