Earth and Mars – Distinct inner solar system products

Yoshizaki, Takashi; McDonough, William F.

doi:10.1016/j.chemer.2021.125746

Cited by 18 publications

(7 citation statements)

References 241 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the mantle, the prior bounds cover the representative range of seismic Martian interior models described in Smrekar et al (2019) and in Yoshizaki and McDonough (2021), constrained by geodetic data, geochemical and thermal considerations. The seismic velocities from the geodynamically constrained approach are directly obtained from the thermal profiles and the assumed mantle composition, as detailed in Section 4.1.2.…”

Section: 1029/2021je007067mentioning

confidence: 99%

Marsquake locations and 1-D seismic models for Mars from InSight data

Drilleau

Samuel

Garcia

et al. 2022

Preprint

View full text Add to dashboard Cite

We present inversions for the structure of Mars using the first Martian seismic record collected by the InSight lander. We identified and used arrival times of direct, multiples, and depth phases of body waves, for 17 marsquakes to constrain the quake locations and the one-dimensional average interior structure of Mars. We found the marsquake hypocenters to be shallower than 40 km depth, most of them being located in the Cerberus Fossae graben system, which could be a source of marsquakes. Our results show a significant velocity jump between the upper and the lower part of the crust, interpreted as the transition between intrusive and extrusive rocks. The lower crust makes up a significant fraction of the crust, with seismic velocities compatible with those of mafic to ultramafic rocks. Additional constraints on the crustal thickness from previous seismic analyses, combined with modeling relying on gravity and topography measurements, yield constraints on the present-day thermochemical state of Mars and on its long-term history. Our most constrained inversion results indicate a present-day surface heat flux of 22 ± 1 mW/m 2 , a relatively hot mantle (potential temperature: 1740 ± 90 K) and a thick lithosphere (540 ± 120 km), associated with a lithospheric thermal gradient of 1.9 ± 0.3 K/km. These results are compatible with recent seismic studies using a reduced data set and different inversion approaches, confirming that Mars' potential mantle temperature was initially relatively cold (1780 ± 50 K) compared to that of its present-day state, and that its crust contains 10-12 times more heat-producing elements than the primitive mantle. Plain Language SummaryThe seismic recordings from the InSight mission have proven that Mars is an active planet. Among the several 100s of detected marsquakes, 17 have a sufficient quality to constrain the internal structure of Mars. We found that most of these marsquakes occurred at depths shallower than 40 km, and are located in the Cerberus Fossae region. There are faults in this area, which could be a source of quakes. An important finding is that as on Earth, the crust is made of two types of rocks formed when hot molten material is cooling, quickly near the surface, and slowly in depth because temperature under the planet's surface is higher. Combining our seismic data with other independent geophysical measurements, we are able to reconstruct the thermal history of Mars. Our results indicate that Mars has a relatively hot mantle, and that the uppermost mantle temperature was initially colder than at the present.

show abstract

Section: 1029/2021je007067mentioning

confidence: 99%

Marsquake locations and 1-D seismic models for Mars from InSight data

Drilleau

Samuel

Garcia

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

“…The Mn/Na ratios of CI chondrites, Earth, and Mars are from refs. 45 , 67 , and 4 , respectively, and those of the Moon, Vesta, and angrites are from ref. 7 .…”

Section: Resultsmentioning

confidence: 99%

“…The inner Solar System, which features terrestrial planets, the Moon, and the asteroid belt, is depleted in volatile elements relative to the bulk solar composition sampled by carbonaceous Ivuna-type (CI) chondrites. This depletion has been debated to reflect either 1) devolatilization of interstellar dust and inheritance of the depletion by the inner solar nebula 1 , 2) incomplete condensation from the dispersing solar nebula 2 , 3) accretion of volatile-depleted materials like chondrules 3 , 4 , or 4) evaporative loss during planetary accretion or degassing 5 – 7 . Studies of moderately volatile elements (MVEs) have provided valuable insights to distinguish between these scenarios because their isotopes are fractionated to different extents and/or in different directions during these processes.…”

Section: Introductionmentioning

confidence: 99%

Potassium isotope heterogeneity in the early Solar System controlled by extensive evaporation and partial recondensation

Moynier

Bizzarro

2022

Nat Commun

View full text Add to dashboard Cite

Volatiles are vital ingredients for a habitable planet. Angrite meteorites sample the most volatile-depleted planetesimal in the Solar System, particularly for the alkali elements. They are prime targets for investigating the formation of volatile-poor rocky planets, yet their exceptionally low volatile content presents a major analytical challenge. Here, we leverage improved sensitivity and precision of K isotopic analysis to constrain the mechanism of extreme K depletion (>99.8%) in angrites. In contrast with the isotopically heavy Moon and Vesta, we find that angrites are strikingly depleted in the heavier K isotopes, which is best explained by partial recondensation of vaporized K following extensive evaporation on the angrite parent body (APB) during magma-ocean stage. Therefore, the APB may provide a rare example of isotope fractionation controlled by condensation, rather than evaporation, at a planetary scale. Furthermore, nebula-wide K isotopic variations primarily reflect volatility-driven fractionations instead of presolar nucleosynthetic heterogeneity proposed previously.

show abstract

“…M edium H models have approximately 2 3 primordial and 1 3 radiogenic energy driving the earth's major geodynamic processes (i.e., mantle convection, plate tectonics and the geodynamo). Recently, Yoshizaki and McDonough (2021) also showed that the Earth and Mars are equally enriched in refractory elements by 1.9 × CI, which might reflect the enrichment levels for all of the terrestrial planets and point to a fundamental attribute of inner solar system's building blocks.…”

Section: Compositional Models For the Earthmentioning

confidence: 98%

Neutrino Geoscience: Review, survey, future prospects

McDonough¹,

Watanabe²

2022

Preprint

View full text Add to dashboard Cite

The earth's surface heat flux is 46±3 TW (terrawatts, 10 12 watts). Although many assume we know the earth's abundance and distribution of radioactive heat producing elements (i.e., U, Th, and K), estimates for the mantle's heat production varying by an order of magnitude and recent particle physics findings challenge our dominant paradigm. Geologists predict the earth's budget of radiogenic power at 20±10 TW, whereas particle physics experiments predict 15.3 +4.9 −4.9 TW (KamLAND, Japan) and 38.2 +13.6 −12.7 TW (Borexino, Italy).We welcome this opportunity to highlight the fundamentally important resource offered by the physics community and call attention to the shortcomings associated with the characterization of the geology of the earth. We review the findings from continentbased, physics experiments, the predictions from geology, and assess the degree of misfit between the physics measurements and predicted models of the continental lithosphere and underlying mantle. Because our knowledge of the continents is somewhat uncertain (7.1 +2.1 −1.6 TW), models for the radiogenic power in the mantle (3.5 to 32 TW) and the bulk silicate earth (crust plus mantle) continue to be uncertain by a factor of ∼10 and ∼4, respectively. Detection of a geoneutrino signal in the ocean, far from the influence of continents, offers the potential to resolve this tension. Neutrino geoscience is a powerful new tool to interrogate the composition of the continental crust and mantle and its structures.

show abstract

Earth and Mars – Distinct inner solar system products

Cited by 18 publications

References 241 publications

Marsquake locations and 1-D seismic models for Mars from InSight data

Marsquake locations and 1-D seismic models for Mars from InSight data

Potassium isotope heterogeneity in the early Solar System controlled by extensive evaporation and partial recondensation

Neutrino Geoscience: Review, survey, future prospects

Contact Info

Product

Resources

About