Article
Geosciences, Multidisciplinary
Yang Li, Zhigang Zhang, Juan Li, Zhidong Shi, Liang Zhao
Summary: Thermal conductivity of the mantle varies with pressure and composition, and it plays a crucial role in the thermochemical evolution of the Earth's mantle. Increasing depth-dependent thermal conductivity leads to a larger core-mantle boundary heat flow and more stable thermochemical piles, while decreasing composition-dependent thermal conductivity slightly destabilizes the primordial thermochemical piles. The long-term stability of the piles decreases if the primordial mantle material is compositionally more viscous and this destabilizing effect is enhanced by decreasing composition-dependent thermal conductivity. Overall, the combined effects of depth- and composition-dependent thermal conductivity and compositional viscosity ratio significantly influence the thermochemical evolution of the mantle.
SCIENCE CHINA-EARTH SCIENCES
(2023)
Article
Geochemistry & Geophysics
Claudia Stein, Ulrich Hansen
Summary: The Earth's core-mantle boundary (CMB) has complex seismic anomalies such as large low shear-wave velocity provinces (LLSVPs) and ultra-low velocity zones (ULVZs). To simulate the dynamics of these structures, ad hoc assumptions are made in models of mantle convection. Density and mass, which are critical for the dynamics, are hardly constrained. One possible origin for the dense layer above the CMB is core-mantle interaction. The study analyzes the penetration of dense material into the mantle using a chemical gradient and suggests that convection-assisted diffusion plays a crucial role in the formation of chemically distinct piles and can explain the coexistence of LLSVPs and ULVZs.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Geochemistry & Geophysics
Tomoko Korenaga, Jun Korenaga, Hitoshi Kawakatsu, Makoto Yamano
Summary: The new reference model for the evolution of oceanic lithosphere is based on thermal conduction and realistic material properties, explaining bathymetry and heat flow data on normal seafloor successfully, with particular emphasis on the notable impact of secular cooling on old seafloor bathymetry.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Geochemistry & Geophysics
G. Choblet, F. Deschamps, H. Amit, M. Lasbleis
Summary: The heat flux pattern at Earth's core-mantle boundary has a significant impact on core dynamics, but the traditional linear approximation method has biases. We analyze the influence of thermochemical mantle on seismic velocities and derive a formalism to infer the CMB heat flux from seismic shear velocity anomalies. Applying this formalism provides better fits than the commonly used linear fits.
PHYSICS OF THE EARTH AND PLANETARY INTERIORS
(2023)
Article
Geosciences, Multidisciplinary
Grant T. Euen, Shangxin Liu, Rene Gassmoller, Timo Heister, Scott D. King
Summary: With the increasing availability of high-performance computing, numerical models have become essential in geodynamics research. This study compares the accuracy of the finite-element codes ASPECT and CitcomS and finds good agreement between the globally averaged quantities and time evolution of both codes.
GEOSCIENTIFIC MODEL DEVELOPMENT
(2023)
Article
Geosciences, Multidisciplinary
Yasuhiro Kuwayama, Kei Hirose, Laura Cobden, Mayu Kusakabe, Shigehiko Tateno, Yasuo Ohishi
Summary: Through high-pressure and high-temperature X-ray diffraction measurements, we discovered that a phase transition occurs in pyrolite even at high temperatures and pressures, indicating the presence of post-perovskite above the core-mantle boundary. This has significant implications for seismology, geodynamics, and heat transfer.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geochemistry & Geophysics
Fabio A. Capitanio, Oliver Nebel, Jean-Francois Moyen, Peter A. Cawood
Summary: This study uses numerical models to simulate the formation of cratons and finds that the strength of the thermal lithosphere and mantle temperature play a crucial role in their formation. The presence of large volumes of melted rocks in cratons can explain the record of tectonic activity in the Archaean era and provide insights into the thermal evolution of the early Earth.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Multidisciplinary Sciences
Zahra Shariatinia, Seyed-Iman Sarmalek
Summary: In this study, several butterfly-shaped materials composed of DBT and DBT5 cores were designed as HTMs for perovskite solar cells. Their properties were investigated using density functional theory calculations. The results revealed that these materials exhibited high solubility, stability, and hole mobility, making them promising candidates for efficient HTMs in PSCs.
SCIENTIFIC REPORTS
(2022)
Article
Multidisciplinary Sciences
Adnan, Rashid Murtaza, Iftikhar Hussain, Ziaur Rehman, Ilyas Khan, Mulugeta Andualem
Summary: The study focused on the heat transfer of nanofluids over a wedge, taking into account the effects of viscous dissipation and thermal radiation. Numerical methods were used to obtain the velocity and temperature distributions under different flow parameters, revealing the significant influence of preeminent flow parameters and imposed thermal radiation on the thermal performance of the nanofluid.
SCIENTIFIC REPORTS
(2022)
Article
Mathematics
Safak Kayikci
Summary: This study examines the heat-mass effects of a third grade nanofluid flow through a triply stratified medium with nanoparticles and gyrostatic microorganisms swimming in the flow, using a non-Fourier model for heat and mass fluxes. Results show detailed illustrations of the effects of various physical parameters and reveal that as the bioconvection Lewis number increases, the entropy rate rises, while the porosity parameter and modified Hartmann number exhibit opposite behavior in the velocity profile.
JOURNAL OF MATHEMATICS
(2022)
Article
Mechanics
Callum Watson, Jerome A. Neufeld, Chloe Michaut
Summary: This study investigates the growth and stability of a planetary stagnant lid and finds that pressure and temperature have significant effects on the rheology, which may lead to asymmetric lid growth and potentially affect the formation of crustal dichotomy on the Moon.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Geochemistry & Geophysics
S. M. Langemeyer, J. P. Lowman, P. J. Tackley
Summary: More than two decades of research have made progress in generating plate-like surface behavior in models of mantle convection. The properties required for dynamic plates from mantle convection have been widely recognized and used in both 2-D and 3-D geometries. Studying the properties needed to obtain deep mantle features with LLSVP-like characteristics has become a topic of interest. The study focuses on discovering the properties that can produce a detached pair of 3-D features different from the ambient mantle.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2022)
Article
Multidisciplinary Sciences
Abdulaziz Alsenafi, M. Ferdows
Summary: The study focused on the steady mixed convection flow towards an isothermal permeable vertical cylinder nested in a fluid-saturated porous medium, applying the Darcy model to observe bioconvection. The results indicated the existence of dual solutions in opposing flow beyond a critical point, where both solutions are connected, influenced by the systems' parameters.
SCIENTIFIC REPORTS
(2021)
Article
Thermodynamics
Marco Rosales-Vera
Summary: This paper presents a numerical analysis of the Graetz problem with viscous dissipation, showing the importance of considering the effect of viscous dissipation in engineering problems where the Brinkman number is large.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Mechanics
A. Nawab, L. diMare
Summary: This paper investigates the volume-averaged flowfield in a regular array of cylinders using scale-resolving computations, analyzing the macroscopic turbulent kinetic energy conservation law. The results show that the macroscopic velocity profiles are similar to the canonical turbulent channel flow profiles, but with different parameter values. The production rate of volume-averaged TKE stays large throughout the domain, unlike in channel flow where it attenuates rapidly after a near-wall peak.
Article
Geochemistry & Geophysics
Thomas Breton, Ghylaine Quitte, Michael J. Toplis, Marc Monnereau, Jean-Louis Birck, Christa Goepel, Cyril Charles
EARTH AND PLANETARY SCIENCE LETTERS
(2015)
Article
Geochemistry & Geophysics
J. Guignard, M. J. Toplis, M. Bystricky, M. Monnereau
EARTH AND PLANETARY SCIENCE LETTERS
(2016)
Article
Geochemistry & Geophysics
K. Gillet, L. Margerin, M. Calvet, M. Monnereau
PHYSICS OF THE EARTH AND PLANETARY INTERIORS
(2017)
Article
Geosciences, Multidisciplinary
Anne Nedelec, Marc Monnereau, Michael J. Toplis
Article
Geochemistry & Geophysics
Hugau Mizzon, Marc Monnereau
EARTH AND PLANETARY SCIENCE LETTERS
(2013)
Article
Geochemistry & Geophysics
Marc Monnereau, Michael J. Toplis, David Baratoux, Jeremy Guignard
GEOCHIMICA ET COSMOCHIMICA ACTA
(2013)
Article
Geochemistry & Geophysics
M. J. Toplis, H. Mizzon, M. Monnereau, O. Forni, H. Y. McSween, D. W. Mittlefehldt, T. J. McCoy, T. H. Prettyman, M. C. De Sanctis, C. A. Raymond, C. T. Russell
METEORITICS & PLANETARY SCIENCE
(2013)
Article
Geochemistry & Geophysics
David Baratoux, Henri Samuel, Chloe Michaut, Michael J. Toplis, Marc Monnereau, Mark Wieczorek, Raphael Garcia, Kei Kurita
JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS
(2014)
Article
Geochemistry & Geophysics
A. Neri, J. Guignard, M. Monnereau, M. J. Toplis, G. Quitte
EARTH AND PLANETARY SCIENCE LETTERS
(2019)
Article
Materials Science, Multidisciplinary
E. Boue, S. Schuller, M. J. Toplis, T. Charpentier, A. Mesbah, H. Pablo, M. Monnereau, M. Moskura
JOURNAL OF NUCLEAR MATERIALS
(2019)
Article
Geochemistry & Geophysics
N. Compaire, L. Margerin, M. Monnereau, R. F. Garcia, L. Lange, M. Calvet, N. L. Dahmen, S. C. Staehler, N. Mueller, M. Grott, P. Lognonne, T. Spohn, W. B. Banerdt
Summary: This study investigates the seasonal variation of the near-surface properties on Mars using the SEIS seismometer. By analyzing background vibrations and high-frequency seismic events, the researchers found that the observed velocity changes can be adequately modeled by the thermoelastic response of the Martian regolith. Different seasons lead to different waveform characteristics.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2022)
Article
Geochemistry & Geophysics
A. Neri, M. Monnereau, J. Guignard, M. Bystricky, C. Tenailleau, B. Duployer, M. J. Toplis, G. Quitte
Summary: Research on the textures of solid and molten metal in the presence of varying fractions of silicate melt at high temperature sheds light on the differentiation processes occurring in magma oceans of rocky bodies in the early solar system. Experimental results show significant differences in the textures of metal grains formed under different conditions, providing important insights into the chemical and thermodynamic processes in magma oceans.
PHYSICS OF THE EARTH AND PLANETARY INTERIORS
(2021)
Article
Astronomy & Astrophysics
Marc Monnereau, Jeremy Guignard, Adrien Neri, Michael J. Toplis, Ghylaine Quitte
Summary: The petrologic and geochemical diversity of meteorites is influenced by the bulk composition of the parent bodies as well as how internal differentiation occurred. Factors such as size and accretion time play a role in this differentiation process. The study examines the time scales of heating, cooling, and drainage of silicate liquids and proposes that drainage time is proportional to matrix viscosity and liquid viscosity. The properties of these liquids vary significantly during thermal evolution, challenging the assumption of constant properties in small body differentiation. It is concluded that drainage cannot prevent the occurrence of a global magma ocean in bodies accreted during the early stages of the solar system, which provides insight into the formation of iron meteorite parent bodies.
Article
Geochemistry & Geophysics
Adrien Neri, Jeremy Guignard, Marc Monnereau, Misha Bystricky, Jean-Philippe Perrillat, Denis Andrault, Andrew King, Nicolas Guignot, Christophe Tenailleau, Benjamin Duployer, Michael J. Toplis, Ghylaine Quitte
PHYSICS OF THE EARTH AND PLANETARY INTERIORS
(2020)
Article
Astronomy & Astrophysics
O. Mousis, A. Drouard, P. Vernazza, J. I. Lunine, M. Monnereau, R. Maggiolo, K. Altwegg, H. Balsiger, J. -J. Berthelier, G. Cessateur, J. De Keyser, S. A. Fuselier, S. Gasc, A. Korth, T. Le Deun, U. Mall, B. Marty, H. Reme, M. Rubin, C. -Y. Tzou, J. H. Waite, P. Wurz
ASTROPHYSICAL JOURNAL LETTERS
(2017)