A5033726538- Astro and Planetary Science
- Planetary Science and Exploration
- Geological and Geochemical Analysis
- High-pressure geophysics and materials
- Geomagnetism and Paleomagnetism Studies
- Geology and Paleoclimatology Research
- Space Exploration and Technology
- Stellar, planetary, and galactic studies
- Paleontology and Stratigraphy of Fossils
- Space Science and Extraterrestrial Life
- Geological Studies and Exploration
- Isotope Analysis in Ecology
- Geochemistry and Geologic Mapping
- Hydrocarbon exploration and reservoir analysis
- earthquake and tectonic studies
- Marine and environmental studies
- Methane Hydrates and Related Phenomena
- Astrophysics and Star Formation Studies
- Nuclear Physics and Applications
- Space exploration and regulation
- Paranormal Experiences and Beliefs
- Atmospheric and Environmental Gas Dynamics
- Geological and Geophysical Studies
- Solar and Space Plasma Dynamics
- Astronomy and Astrophysical Research
Arizona State University
2016-2025
Institut de physique du globe de Paris
2025
Centre National de la Recherche Scientifique
2025
Université Paris Cité
2025
Search for Extraterrestrial Intelligence
2024
Earth and Space Research
2015-2022
Google (United States)
2018
The University of Tokyo
2018
Life Science Institute
2018
Tokyo Institute of Technology
2018
Theory and observations point to the occurrence of magma ponds or oceans in early evolution terrestrial planets many early-accreting planetesimals. The apparent ubiquity melting during giant accretionary impacts suggests that silicate metallic material may be processed through multiple before reaching solidity a planet. processes ocean formation solidification, therefore, strongly influence earliest compositional differentiation volatile content planets, they form starting for cooling...
Hotspots on Venus The surface of shows clear signs volcanism, but are there active volcanoes today? answer to this question will bear our understanding the planet's climate evolution and interior dynamics. Using thermal emissivity data returned by Express spacecraft, Smrekar et al. (p. 605 , published online 8 April) looked at three hotspots Venus. These places were identified analogy with terrestrial like Hawaii, which believed overlie mantle plumes be most likely sites for current volcanic...
Abstract— Crystallization of a magma ocean on large terrestrial planet that is significantly melted by the energy accretion may lead to an unstable cumulate density stratification, which overturn stable configuration. Overturn initially stratification produce early basaltic crust and differentiated mantle reservoirs. Such compositional can have important implications for planet's subsequent evolution delaying or suppressing thermal convection influencing distribution radiogenic heat sources....
Core formation should have stripped the terrestrial, lunar, and martian mantles of highly siderophile elements (HSEs). Instead, each world has disparate, yet elevated HSE abundances. Late accretion may offer a solution, provided that ≥0.5% Earth masses broadly chondritic planetesimals reach Earth's mantle ~10 ~1200 times less mass goes to Mars Moon, respectively. We show leftover planetesimal populations dominated by massive projectiles can explain these additions, with our inferred size...
The bulk composition of an exoplanet is commonly inferred from its average density. For small planets, however, the density not unique within range compositions. Variations a number important planetary parameters—which are difficult or impossible to constrain measurements alone—produce planets with same densities but widely varying We find that adding gas envelope equivalent 0.1%-10% mass solid planet causes radius increase 5%-60% above gas-free value. A given and might have substantial...
Removal of the lower lithosphere (mantle with or without portions crust) through ductile gravitational instabilities can produce magma under continents. Using numerical experiments approximating rheology continental crust and underlying asthenosphere using phase equilibria from literature, I investigate topographic magmatic results lithospheric instabilities, along fate sinking material. Lithospheric removal, commonly referred to as delamination regardless mechanism, may allow asthenospheric...
Models for Martian magma oceans of varying depths predict that decompression mantle melting, perhaps forming Mars' earliest crust, could occur during gravitationally driven solid‐state overturn cumulates following ocean solidification. When hot rise from depth overturn, some regions melt adiabatically, producing basaltic to andesitic magmas. The resulting crust would be formed at between 30 and 50 Myr after planetary accretion, when solidification subsequent are complete. deeper than ∼1550...
Hydrous fluids derived by dehydration of the downgoing slab at convergent plate boundaries are thought to provoke wet melting in wedge above plate. We have investigated distribution hydrous fluid and subsequent melt using two‐dimensional models that include solid mantle flow associated temperature distributions along with buoyant migration melting. Solid deflects from their vertical through wedge. Melting therefore does not occur directly region where released slab. A front develops first...
Terrestrial-like exoplanets may obtain atmospheres from three primary sources: Capture of nebular gases, degassing during accretion, and subsequent tectonic activity. Here we model accretion to estimate the range atmospheric mass composition on ranging 1 30 Earth masses. We use bulk compositions drawn primitive differentiated meteorite compositions. Degassing alone can create a wide masses planetary atmospheres, less than percent planet's total up ~6 mass% hydrogen, ~20 water, and/or ~5...
Research Article| January 01, 2014 Acid rain and ozone depletion from pulsed Siberian Traps magmatism Benjamin A. Black; Black * 1Department of Earth, Atmospheric, Planetary Sciences, Massachusetts Institute Technology, Cambridge, 02139, USA *E-mails: bablack@mit.edu; lamar@ucar.edu; shields@ucar.edu; ltelkins@dtm.ciw.edu; jtkon@ucar.edu. Search for other works by this author on: GSW Google Scholar Jean-François Lamarque; Lamarque 2National Center Atmospheric Research, Boulder, Colorado...
Meteorites are samples of dozens small planetary bodies that formed in the early Solar System. They exhibit great petrologic diversity, ranging from primordial accretional aggregates (chondrites), to partially melted residues (primitive achondrites), once fully molten magmas (achondrites). It has long been thought no single parent body could be source more than one these three meteorite lithologies. This view is now being challenged by a variety new measurements and theoretical models,...
Abstract The asteroid 4 Vesta is one of the very few heavenly bodies to have been linked samples on Earth: howardite‐eucrite‐diogenite ( HED ) meteorite suite. This large and diverse suite meteorites provides a detailed picture Vesta's igneous postigneous history. We used range rock types compositions in test series chemical models for solidification processes following peak melting (magma ocean) conditions Vesta. Fractional crystallization cannot dominant early process magma ocean because...
Terrestrial planets, with silicate mantles and metallic cores, are likely to obtain water carbon compounds during accretion. Here I examine the conditions that allow early formation of a surface ocean (simultaneous cooling clement conditions), timeline degassing planetary interior into atmosphere. The greatest fraction planet's initial volatile budget is degassed atmosphere end magma solidification, leaving only small original volatiles be released through later volcanism. Rocky planets...
Abstract What allows a planet to be both within potentially habitable zone and sustain habitability over long geologic time? With the advent of exoplanetary astronomy ongoing discovery terrestrial‐type planets around other stars, our own solar system becomes key testing ground for ideas about what factors control planetary evolution. Mars provides system's longest record interplay physical chemical processes relevant on an accessible rocky with atmosphere hydrosphere. Here we review current...