Results 61 to 70 of about 406 (161)

Composition dependence of spin transition in (Mg,Fe)SiO ₃ bridgmanite [PDF]

American Mineralogist, 2015
Spin transitions in (Mg,Fe)SiO3 bridgmanite have important implications for the chemistry and dynamics of Earth's lower mantle, but have been complex to characterize in experiments. We examine the spin state of Fe in highly Fe-enriched bridgmanite synthesized from enstatites with measured compositions (Mg0.61Fe0.38Ca0.01)SiO3 and (Mg0.25Fe0.74Ca0.01 ...
Dorfman, Susannah, Badro, James, Rueff, Jean-Pascal, Chow, Paul, Xiao, Yuming, Gillet, Philippe   +5 more
openaire   +2 more sources

How lowermost mantle viscosity controls the chemical structure of Earth’s deep interior

Communications Earth & Environment, 2023
Determining the fate of subducted oceanic crust is critical for understanding material cycling through Earth’s deep interior and sources of mantle heterogeneity. A key control on the distribution of subducted slabs over long timescales is the bridgmanite
Juliane Dannberg, Kiran Chotalia, Rene Gassmöller   +2 more
doaj   +1 more source

Limits of Water Storage in Stishovite at Deep Mantle Conditions

Geophysical Research Letters, Volume 53, Issue 13, 16 July 2026.
Abstract The deep Earth water cycle is a key process in Earth's evolution. Stishovite has been proposed as a major carrier of water from the surface into the lower mantle. However, its role remains unclear because its water solubility is controversial. We investigated the water solubility of Al‐free stishovite at pressures of 33–38 GPa and temperatures
Fei Wang, Artem Chanyshev, Lianjie Man, Yunke Song, Lin Wang, Takayuki Ishii, Noriyoshi Tsujino, Shrikant Bhat, Robert Farla, Tomoo Katsura   +9 more
wiley   +1 more source

Thermoelasticity of Fe$^{3+}$- and Al-bearing bridgmanite

, 2016
Under review with Geophysical Research ...
Shukla, Gaurav, Cococcioni, Matteo, Wentzcovitch, Renata M.   +2 more
openaire   +2 more sources

Thermal Conductivity of MgSiO3‐H2O System Determined by Machine Learning Potentials

Geophysical Research Letters
Thermal conductivity plays a pivotal role in understanding the dynamics and evolution of Earth's interior. The Earth's lower mantle is dominated by MgSiO3 polymorphs which may incorporate trace amounts of water.
Yihang Peng, Jie Deng
doaj   +1 more source

Evolution of Sulfur Concentration in the Deep Earth During the Proto‐Earth Growth: First‐Principles Study on the Sulfur Partitioning Between Metal and Silicate at High Pressure and Temperature

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 7, July 2026.
Abstract Sulfur (S) is one of the promising light elements that can explain the density deficit of the core. The degree of siderophile nature of S under high pressure and temperature (P,T) is the key to estimating the S content in the core. However, a significant discrepancy between the metal‐silicate partition coefficient of S extrapolated from ...
K. Itoh, T. Tsuchiya
wiley   +1 more source

Earth's Lower Mantle Predominated by Ferric Iron‐Rich Bridgmanite Inferred From High Pressure Elasticity Measurements

Geophysical Research Letters
The absence of sound‐velocity data spanning the entire lower mantle pressures for (Fe, Al)‐bearing bridgmanite impedes direct comparisons with seismic wave observations, leaving the chemistry of the lower mantle unresolved.
P. Saha, M. Murakami, N. Miyajima
doaj   +1 more source

Beyond Equilibrium: Kinetic Thresholds and Rheological Feedbacks Create a Potentially Complex 410 in Slab Regions

Journal of Geophysical Research: Solid Earth, Volume 131, Issue 7, July 2026.
Abstract The seismic expression of Earth's 410 km discontinuity varies across tectonic settings, from sharp, high‐amplitude interfaces to broad transitions—patterns that cannot be explained by equilibrium thermodynamics without invoking large‐scale thermal or compositional heterogeneities.
Buchanan Kerswell, John Wheeler, Rene Gassmöller, J. Huw Davies, Isabel Papanagnou, Sanne Cottaar   +5 more
wiley   +1 more source

New knowledge about shock events that affected the L‐chondrite parent body from two heavily shocked L6 meteorite finds

Meteoritics &Planetary Science, Volume 61, Issue 7, Page 1610-1626, July 2026.
Abstract We report new results from a study of shock‐related features in the L6 ordinary chondrites Northwest Africa (NWA) 4672 and NWA 12841. Our observations confirm the occurrence of eight high‐pressure (HP) minerals in each meteorite, namely, ringwoodite, majorite, akimotoite, wadsleyite, albitic jadeite, lingunite, tuite, and xieite.
I. Baziotis, L. Ferrière, C. Ma, J. Hu, D. Palles, P. D. Asimow   +5 more
wiley   +1 more source

Thermal Equation of State and Structural Evolution of Al‐Bearing Bridgmanite

Journal of Geophysical Research: Solid Earth
Abstract (Mg, Fe, Al)(Si, Al)O 3 bridgmanite is the most abundant mineral of Earth′s lower mantle. Al is incorporated in the crystal structure of bridgmanite through the Fe 3+ AlO 3 and AlAlO
Giacomo Criniti, Tiziana Boffa Ballaran, Alexander Kurnosov, Zhaodong Liu, Konstantin Glazyrin, Marco Merlini, Michael Hanfland, Daniel J. Frost   +7 more
openaire   +3 more sources