D. P. Dobson
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View article: Experimental observations of CaSiO3-CaTiO3 perovskites: implications for Ca-rich inclusions observed in sub-lithospheric diamonds
Experimental observations of CaSiO3-CaTiO3 perovskites: implications for Ca-rich inclusions observed in sub-lithospheric diamonds Open
Calcium perovskite is a major component of deep mantle phase assemblages and has been frequently identified, in retrograde form, as polyphase mineral inclusions within sub-lithospheric diamonds. Here experimental observations of synthetic …
View article: The thermal expansion of the clinopyroxene and garnet polymorphs of Na2MgSi5O12 determined by X-ray powder diffraction
The thermal expansion of the clinopyroxene and garnet polymorphs of Na2MgSi5O12 determined by X-ray powder diffraction Open
The temperature dependence of the unit-cell parameters of synthetic Na(Mg 0.5 Si 0.5 )Si 2 O 6 clinopyroxene and Na 2 MgSi 5 O 12 garnet were measured, at atmospheric pressure, using X-ray powder diffraction, from 40 K up to their decompos…
View article: KANICE: Kolmogorov-Arnold Networks with Interactive Convolutional Elements
KANICE: Kolmogorov-Arnold Networks with Interactive Convolutional Elements Open
We introduce KANICE (Kolmogorov-Arnold Networks with Interactive Convolutional Elements), a novel neural architecture that combines Convolutional Neural Networks (CNNs) with Kolmogorov-Arnold Network (KAN) principles. KANICE integrates Int…
View article: An Algorithm for Modelling Differential Processes Utilising a Ratio-Coupled Loss
An Algorithm for Modelling Differential Processes Utilising a Ratio-Coupled Loss Open
We introduce an algorithm for combining two sources of similar data within a loss function to use in an optimisation procedure. The technique involves training model parameters on a ratio of two data sources to encourage convergence on met…
View article: Forecasting Buoy Observations Using Physics-Informed Neural Networks
Forecasting Buoy Observations Using Physics-Informed Neural Networks Open
Methodologies inspired by physics-informed neural networks (PINNs) were used to forecast observations recorded by stationary ocean buoys. We combined buoy observations with numerical models to train surrogate deep learning networks that pe…
View article: Magma mixing between rhyolite and pseudotachylite as the origin for the Glencoe ‘flinty crush rock’
Magma mixing between rhyolite and pseudotachylite as the origin for the Glencoe ‘flinty crush rock’ Open
The Glencoe caldera is a well-studied example of a caldera system exposed to intermediate depths along the glacially excavated glen. We present a first quantitative assessment of clast-size population and matrix chemistry from the flinty c…
View article: Structure and thermal expansion of end-member olivines I: Crystal and magnetic structure, thermal expansion, and spontaneous magnetostriction of synthetic fayalite, Fe<sub>2</sub>SiO<sub>4</sub>, determined by high-resolution neutron powder diffraction
Structure and thermal expansion of end-member olivines I: Crystal and magnetic structure, thermal expansion, and spontaneous magnetostriction of synthetic fayalite, Fe<sub>2</sub>SiO<sub>4</sub>, determined by high-resolution neutron powder diffraction Open
The lattice parameters and the crystal and magnetic structures of Fe 2 SiO 4 have been determined from 10 K to 1453 K by high-resolution time-of-flight neutron powder diffraction. Fe 2 SiO 4 undergoes two antiferromagnetic phase transforma…
View article: Kelyphite Textures Experimentally Reproduced through Garnet Breakdown in the Presence of a Melt Phase
Kelyphite Textures Experimentally Reproduced through Garnet Breakdown in the Presence of a Melt Phase Open
Complex multiphase reaction rims that form during garnet breakdown are known as kelyphite coronae and are common amongst exhumed mantle xenoliths. It has long been established that a reaction of garnet and olivine produces kelyphite corona…
View article: Deformation of Post‐Spinel Under the Lower Mantle Conditions
Deformation of Post‐Spinel Under the Lower Mantle Conditions Open
To study the viscosity of bridgmanite and ferropericlase aggregate, uniaxial compression deformation experiments on pre‐synthesized post‐spinel phase and bridgmanite two‐layered samples were conducted under top lower mantle pressure and 17…
View article: Deformation of post-spinel under the lower mantle conditions
Deformation of post-spinel under the lower mantle conditions Open
Data used in Deformation of post-spinel under the lower mantle conditions F. Xu1, 2, D. Yamazaki1, S. A. Hunt3, 2, N. Tsujino1, Y. Higo4, Y. Tange4, K. Ohara4, D. P. Dobson2 1 Institute for Planetary Materials, Okayama University, Misasa, …
View article: Deformation of post-spinel under the lower mantle conditions
Deformation of post-spinel under the lower mantle conditions Open
Data used in Deformation of post-spinel under the lower mantle conditions F. Xu1, 2, D. Yamazaki1, S. A. Hunt3, 2, N. Tsujino1, Y. Higo4, Y. Tange4, K. Ohara4, D. P. Dobson2 1 Institute for Planetary Materials, Okayama University, Misasa, …
View article: Deformation of NaCoF<sub>3</sub> perovskite and post-perovskite up to 30 GPa and 1013 K: implications for plastic deformation and transformation mechanism
Deformation of NaCoF<sub>3</sub> perovskite and post-perovskite up to 30 GPa and 1013 K: implications for plastic deformation and transformation mechanism Open
Texture, plastic deformation, and phase transformation mechanisms in perovskite and post-perovskite are of general interest for our understanding of the Earth's mantle. Here, the perovskite analogue NaCoF3 is deformed in a resistive-heated…
View article: Data for deformation and transformation of NaCoF3 perovskite and post-perovskite up to 30 GPa and 1013 K
Data for deformation and transformation of NaCoF3 perovskite and post-perovskite up to 30 GPa and 1013 K Open
Data and plasticity modeling files for experiment NaCoF3_01 at PETRA P02 on NaCoF3 deformation and transformation from perovskite to post-perovskite. Data set in association with a publication in press in the European Journal of Mineralogy.
View article: The tungsten carbide–carbon monoxide–tungsten buffer and its use for synthesizing iron-bearing silicates in muffle furnaces
The tungsten carbide–carbon monoxide–tungsten buffer and its use for synthesizing iron-bearing silicates in muffle furnaces Open
A new “solid-state” oxygen buffering reaction (WC-COW), WC + 1/2O2 ⇌ CO + W, is presented. At atmospheric pressure, the oxygen fugacity in equilibrium with this buffer is approximated in the range of 600–1200 °C by logfO2=1.53−21008TK±0.13…
View article: Grain boundary character information via individual imaging or statistical analyses: complexion transitions and grain boundary segregation
Grain boundary character information via individual imaging or statistical analyses: complexion transitions and grain boundary segregation Open
<p>Grain boundaries affect bulk properties of polycrystalline materials, such as electrical conductivity, melting or bulk viscosity. In the past two decades, observations of marked bulk material property changes have been associated …
View article: Phase diagram and thermal expansion of orthopyroxene-, clinopyroxene-, and ilmenite-structured MgGeO3
Phase diagram and thermal expansion of orthopyroxene-, clinopyroxene-, and ilmenite-structured MgGeO3 Open
The MgGeO3 system is a low-pressure analog for the Earth-forming (Mg,Fe)SiO3 system and exhibits recoverable orthopyroxene, clinopyroxene, and ilmenite structures below 6 GPa. The pressure-temperature conditions of the clinopyroxene to ilm…
View article: Peritectic Melting of Mica in Fault‐Related Pseudotachylite Melts and Potassium Mass Balance as an Indicator of Fluid‐Absent Source Conditions.
Peritectic Melting of Mica in Fault‐Related Pseudotachylite Melts and Potassium Mass Balance as an Indicator of Fluid‐Absent Source Conditions. Open
Pseudotachylites are generally considered to be produced by flash melting of the most fusible minerals, with compositions often dominated by biotite mica. We present phase fraction calculations for 237 pseudotachylite analyses from 28 loca…
View article: Impact of Coseismic Frictional Melting on Particle Size, Shape Distribution and Chemistry of Experimentally-Generated Pseudotachylite
Impact of Coseismic Frictional Melting on Particle Size, Shape Distribution and Chemistry of Experimentally-Generated Pseudotachylite Open
In natural friction melts, or pseudotachylites, clast textures and glass compositions can influence the frictional behavior of faults hosting pseudotachylites, and are, in turn, sensitive to the processes involved in pseudotachylite format…
View article: Anisotropic diffusion creep in postperovskite provides a new model for deformation at the core−mantle boundary
Anisotropic diffusion creep in postperovskite provides a new model for deformation at the core−mantle boundary Open
Significance Earth’s core−mantle region is an important, but poorly understood, region which drives mantle convection (and hence surface processes) by heat transfer from the core to the mantle. Seismic observations show the complexity of t…
View article: DOE SFWST Campaign R&D Roadmap Update
DOE SFWST Campaign R&D Roadmap Update Open
The Spent Fuel and Waste Science and Technology (SFWST) Campaign of the U.S. Department of Energy (DOE) Office of Nuclear Energy (NE), Office of Spent Fuel and Waste Disposition (SFWD) is conducting research and development (R&D) on deep g…
View article: An Experimental Investigation of the Relative Strength of the Silica Polymorphs Quartz, Coesite, and Stishovite
An Experimental Investigation of the Relative Strength of the Silica Polymorphs Quartz, Coesite, and Stishovite Open
In this study, quartz, coesite, and stishovite were deformed concurrently with an olivine reference sample at high pressure and 850 ± 50 °C. Olivine deformed with an effective stress exponent ( n ) of , which we interpret to indicate that …