Article
Geosciences, Multidisciplinary
Hongzhan Fei
Summary: The study indicates the presence of a dehydrated melting layer in the deep mantle, where the water content significantly decreases with increasing temperature. This melting layer at a depth of 660 kilometers may lead to slab stagnation and inhibit whole mantle convection.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Geosciences, Multidisciplinary
Yanfei Zhang, Qijin Xu, Chao Wang, Zhenmin Jin
Summary: In cold subduction zones, the formation of hydrous carbonatitic liquids provides an effective mechanism for recycling CO2 and promoting the formation of metasomatized domains in the deep mantle. Water released by the decomposition of hydrous minerals significantly impacts the stability of carbonates, facilitating the formation of hydrous carbonatitic liquids for CO2 removal from subducted slabs at great depths in cold thermal regimes.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Multidisciplinary Sciences
Qingyang Hu, Jin Liu, Jiuhua Chen, Bingmin Yan, Yue Meng, Vitali B. Prakapenka, Wendy L. Mao, Ho-Kwang Mao
Summary: The mineralogical transformations in the deep lower mantle under high pressure-temperature conditions with the presence of water were investigated. A previously unknown (Mg,Fe)O2Hx phase was discovered, storing excessive oxygen beyond the charge balance of maximum cation valences. This phase has important implications for extreme redox inhomogeneity, deep-oxygen reservoirs in the lower mantle, and modulating oxygen in the atmosphere.
NATIONAL SCIENCE REVIEW
(2021)
Article
Geochemistry & Geophysics
Fei Wang, Elizabeth C. Thompson, Dongzhou Zhang, Jingui Xu, Ercan E. Alp, Steven D. Jacobsen
Summary: This study investigates the deformation and hydrogen bonding structure of Wadsleyite crystal under high pressures, finding that pressure can affect crystal symmetry and structure distortion, as well as the length of the primary hydrogen bond. The primary O1-H hydrogen bond in Wadsleyite becomes highly nonlinear at high pressures.
AMERICAN MINERALOGIST
(2023)
Article
Multidisciplinary Sciences
Daniel Blatter, Samer Naif, Kerry Key, Anandaroop Ray
Summary: Using experimentally constrained parameterization of mantle melting and Bayesian resistivity inversion, the study suggests that a mantle plume injected volatile-rich melts into the LAB channel. This may be a significant source of anomalies in the Earth's interior globally.
Article
Geochemistry & Geophysics
George Amulele, Shun-ichiro Karato, Jennifer Girard
Summary: High pressure and temperature experiments were conducted on oxide mixtures corresponding to bridgmanite stoichiometry under hydrous shallow lower mantle conditions. Melting occurred in all runs, leading to changes in element partitioning between the melt and residual solids. The study suggests that melting under hydrous lower mantle conditions may explain seismic anomalies and the presence of stishovite in the mantle.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Geosciences, Multidisciplinary
Nao Cai, Xintong Qi, Ting Chen, Siheng Wang, Tony Yu, Yanbin Wang, Toru Inoue, Duojun Wang, Baosheng Li
Summary: The study investigated the wave velocities of phase A under pressure and temperature conditions, as well as its impact on the wave velocities of harzburgite lithology. The results indicate that hydration can increase the wave velocities of the rock.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Geochemistry & Geophysics
C. Tiraboschi, C. McCammon, A. Rohrbach, S. Klemme, J. Berndt, C. Sanchez-Valle
Summary: The role of hydrous silicate melts in transferring oxidized iron in subduction zones has been confirmed by experiments. The experiments showed high concentrations of FeO in the hydrous silicate melts, indicating the dominance of oxidized iron. The results also demonstrated that hydrous silicate melts can dissolve iron oxides more efficiently than aqueous fluids, playing a crucial role in oxidizing the source of arc magma.
GEOCHEMICAL PERSPECTIVES LETTERS
(2023)
Article
Biodiversity Conservation
Yuequn Lai, Jing Zhang, Yongyu Song, Wenwen Li
Summary: This study used continuous satellite images to obtain hydrological information and analyzed the distribution and changes in water volume and surface temperature of the Guanting Reservoir in Beijing from 2000 to 2020. The study also carried out zoning analysis based on stability and found that the trend of water surface temperature has reversed in recent years. The distribution of aquatic plants is consistent with the relatively stable areas of the reservoir. This research provides valuable insights for the management and planning of reservoir submerged areas.
ECOLOGICAL INDICATORS
(2022)
Article
Geochemistry & Geophysics
Anna Barth, Terry Plank, Henry Towbin
Summary: Natural olivine undergoes faster water diffusion at 700-900℃ compared to 1000℃, with the presence of Fe promoting the process. The diffusion rate of water in olivine is mainly controlled by its forsterite content.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2023)
Article
Geochemistry & Geophysics
Shoji Arai, Chihiro Hoshikawa, Makoto Miura, Jun-ichi Ando, Satoko Ishimaru, Nobutatsu Mochizuki, Akihiro Tamura
Summary: The presence of hydrogen in mantle-derived black olivine is reported, possibly released from initially hydrous olivine containing hydroxyl. The released hydrogen may form water, ultimately incorporated in subducted slabs and consumed to form hydrous magmas again, contributing to the recycling of water or hydrogen in the Earth system. The transient black-colored olivines suggest a conversion from initial hydroxyl-bearing olivines of dunites formed from arc-related hydrous magmas.
Article
Geosciences, Multidisciplinary
Xinyang Li, Sergio Speziale, Monika Koch-Mueller, Rachel Jane Husband, Hanns-Peter Liermann
Summary: This study investigates the phase stability of Al-bearing superhydrous phase B (shy-B) and its impact on the water cycle in the deep Earth. It reveals that the incorporation of Al expands the stability range and allows the coexistence of phase D even at normal mantle geotherm conditions. The study highlights the importance of Al in dense hydrous magnesium silicates for understanding the water cycle.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geochemistry & Geophysics
Takayuki Ishii, Eiji Ohtani, Anton Shatskiy
Summary: This study clarified the phase relations and partitioning behavior of aluminum and hydrogen in the MgSiO3-Al2O3-H2O system under lower-mantle conditions. The presence of hydrous phases significantly affected the phase transitions in hydrated slabs descending into the lower mantle. The results suggest that hydrous phases, rather than bridgmanite, serve as the major carriers of water in the lower mantle.
EARTH AND PLANETARY SCIENCE LETTERS
(2022)
Article
Geochemistry & Geophysics
Wenzhong Wang, Han Zhang, John P. Brodholt, Zhongqing Wu
Summary: The mantle transition zone (MTZ) is potentially a geochemical water reservoir due to the high H2O solubility in its dominant minerals. The water content in the MTZ is crucial for understanding deep-water distribution, geochemical recycling, and mantle convection patterns. High-pressure, high-temperature conditions were found to enhance the hydration effect on ringwoodite velocities, with water content affecting elastic moduli and velocities.
EARTH AND PLANETARY SCIENCE LETTERS
(2021)
Article
Nanoscience & Nanotechnology
Sean McSherry, Matthew Webb, Jonathan Kaufman, Zihao Deng, Ali Davoodabadi, Tao Ma, Emmanouil Kioupakis, Keivan Esfarjani, John T. Heron, Andrej Lenert
Summary: An epitaxial heterostructure of perovskite and rocksalt is found to be stable in high-temperature oxidizing environments, providing a solution to the low stability of nanophotonic materials. This discovery opens up possibilities for further breakthroughs in photonic and energy conversion applications.
NATURE NANOTECHNOLOGY
(2022)
Article
Geochemistry & Geophysics
Juliane Dannberg, Robert Myhill, Rene Gassmoller, Sanne Cottaar
Summary: Seismic observations indicate strong heterogeneity in the lowermost mantle, with some suggesting that partial melting at the base of mantle plumes is responsible for ULVZs. However, coupled modeling shows that melt can only remain suspended in partially molten zones under specific conditions, with solid-state compositional variation being necessary to explain the anomalies observed.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Geochemistry & Geophysics
Rong Huang, Tiziana Boffa Ballaran, Catherine A. McCammon, Nobuyoshi Miyajima, Daniel J. Frost
Summary: The crystal chemistry of bridgmanite with Fe and Al revealed that Fe3+ and Al mainly occupy the Mg and Si sites when present in similar proportions. The proportion of oxygen vacancy components is predicted to decrease with pressure. The stability of bridgmanite Fe3+AlO3 component will produce iron metal in the lower mantle, but this appears to be less favorable at 50 GPa.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Geochemistry & Geophysics
C. Perrin, A. Jacob, A. Lucas, R. Myhill, E. Hauber, A. Batov, T. Gudkova, S. Rodriguez, P. Lognonne, J. Stevanovi, M. Drilleau, N. Fuji
Summary: The NASA InSight mission to Mars has successfully landed on the planet and has provided valuable information about seismic activity and the internal structure. Detailed mapping of the Cerberus Fossae region has revealed important morphological features related to tectonic activity, contributing to a better understanding of the geological processes on Mars.
JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS
(2022)
Article
Geology
L. Pasqualetto, F. Nestola, D. E. Jacob, M. G. Pamato, B. Oliveira, S. Perritt, I Chinn, P. Nimis, S. Milani, J. W. Harris
Summary: This study evaluated the reliability of Sm-Nd ages in clinopyroxene inclusions in diamonds. Through crystallographic orientation analyses and Nd diffusion modeling, it was found that some inclusions were co-genetic with diamonds, while others were older. Based on the modeling results, clinopyroxene inclusions smaller than 0.2 mm and equilibrated at temperatures higher than 1050-1080 degrees C may be the most suitable for age determinations.
Article
Geology
Sofia Lorenzon, Davide Novella, Paolo Nimis, Steven D. Jacobsen, Emilie Thomassot, Martha G. Pamato, Loredana Prosperi, Alessandra Lorenzetti, Matteo Alvaro, Frank Brenker, Franco Salvadego, Fabrizio Nestola
Summary: Natural diamonds and their inclusions provide valuable insights into mantle processes. The finding of an unusual inclusion assemblage suggests that diamonds may have traveled downward instead of upward.
Article
Geochemistry & Geophysics
R. Myhill
Summary: This paper presents a strategy for extending scalar equations of state to model anisotropic materials under nearly hydrostatic conditions. The method involves defining scalar equations and a tensor state variable, and provides expressions to describe their relationship and derive related physical properties.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2022)
Article
Geochemistry & Geophysics
L. Eberhard, M. Thielmann, P. Eichheimer, A. Neri, A. Suzuki, M. Ohl, W. Fujita, K. Uesugi, M. Nakamura, G. J. Golabek, D. J. Frost
Summary: A new method to determine fluid flux at high pressures and temperatures has been developed and used to study serpentinites at subduction zone conditions. The experiments show that the amount and distribution of brucite can indicate fluid flow, and that small deviatoric stresses can cause anisotropic fluid flux.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2022)
Article
Geosciences, Multidisciplinary
Tingting Gu, Martha G. Pamato, Davide Novella, Matteo Alvaro, John Fournelle, Frank E. Brenker, Wuyi Wang, Fabrizio Nestola
Summary: This study reveals the nature and composition of the 660 km boundary between the mantle transition zone and lower mantle by analyzing mineral inclusions in a rare gem diamond from Botswana. The recovered lower-mantle minerals and hydrous phases found at this boundary suggest that the peridotitic composition and hydrous conditions extend across the transition zone and into the lower mantle.
Article
Multidisciplinary Sciences
Quancheng Huang, Nicholas C. Schmerr, Scott D. King, Doyeon Kima, Attilio Rivoldini, Ana-Catalina Plesa, Henri Samuel, Ross R. Maguire, Foivos Karakostas, Vedran Lekic, Constantinos Charalambous, Max Collinet, Robert Myhill, Daniele Antonangeli, Melanie Drilleau, Misha Bystricky, Caroline Bollinger, Chloe Michaut, Tamara Gudkova, Jessica C. E. Irving, Anna Horleston, Benjamin Fernando, Kuangdai Leng, Tarje Nissen-Meyer, Frederic Bejina, Ebru Bozdag, Caroline Beghein, Lauren Waszek, Nicki C. Siersch, John-Robert Scholz, Paul M. Davis, Philippe Lognonne, Baptiste Pinot, Rudolf Widmer-Schnidrig, Mark P. Panning, Suzanne E. Smrekar, Tilman Spohn, William T. Pike, Domenico Giardini, W. Bruce Banerdt
Summary: Constraining the thermal and compositional state of the mantle is crucial for deciphering the formation and evolution of Mars. By analyzing seismic data collected by NASA's InSight Mission to Mars, researchers have detected a midmantle discontinuity, revealing information about the temperature and composition of Mars' mantle. This study suggests that the Martian mantle is colder and more iron-enriched compared to Earth's mantle.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Review
Geochemistry & Geophysics
Nicki C. Siersch, Giacomo Criniti, Alexander Kurnosov, Tiziana Boffa Ballaran, Zhaodong Liu, Takayuki Ishii, Daniel J. Frost, Tony Yu, Yanbin Wang
Summary: In this study, the crystal chemistry of MgSiO3-Al2O3 solid solution was investigated using single-crystal X-ray diffraction. The results showed a strong nonlinear behavior of the a- and c-axes as a function of Al content, indicating different accommodation mechanisms in akimotoite and corundum structures. High-pressure experiments also revealed that Al2O3 content affects the compression behavior of akimotoite, with increased compressibility as Al is incorporated into the SiO6 octahedron.
AMERICAN MINERALOGIST
(2023)
Article
Geochemistry & Geophysics
Sumith Abeykoon, Vera Laurenz, Daniel J. Frost, Nobuyoshi Miyajima, Catherine McCammon
Summary: The factors controlling the oxygen content of sulphide melts in the upper mantle were investigated using equilibration experiments with mantle peridotite assemblages. The study found that variations in sulphur/metal cation ratio and oxygen fugacity did not significantly affect the sulphide melt oxygen content. Instead, the main controls on oxygen content were the silicate FeO contents, temperature, and pressure. Nickel was found to lower the oxygen content, but its effect was difficult to separate from other variables.
CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
(2023)
Article
Materials Science, Multidisciplinary
C. Melai, T. Boffa Ballaran, L. Uenver-Thiele, A. Kurnosov, A. I. Chumakov, D. Bessas, D. J. Frost
Summary: In this study, the compressibility of high-pressure magnesioferrite and an intermediate Mg0.5Fe0.52+Fe23+O4 sample were investigated using single-crystal X-ray diffraction. The obtained data contributes to the calculation of the thermodynamic properties of high-pressure mixed valence iron oxides.
PHYSICS AND CHEMISTRY OF MINERALS
(2023)
Article
Geochemistry & Geophysics
James Panton, J. Huw Davies, Robert Myhill
Summary: The large low-shear-velocity provinces (LLSVPs) are believed to have a thermo-chemical origin, and recycled oceanic crust (OC) is a possible source of the chemical heterogeneity. However, the instability of OC due to heterogeneous radiogenic heating reduces its suitability to explain LLSVPs. Geochemical models and heating models also play a role in the formation and longevity of OC piles at the core-mantle boundary.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Geochemistry & Geophysics
Lisa Eberhard, Oliver Pluemper, Daniel J. J. Frost
Summary: We conducted high-pressure experiments to investigate the influence of carbon-bearing phases on fluid release in subducted serpentinites. It was found that the addition of CaCO3 can lower the dehydration temperature and the stability of serpentine in a serpentinite assemblage. However, this reaction does not significantly decrease the proportion of carbonate.
CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
(2023)
Article
Geosciences, Multidisciplinary
Takayuki Ishii, Daniel J. Frost, Eun Jeong Kim, Artem Chanyshev, Keisuke Nishida, Biao Wang, Rintaro Ban, Jianing Xu, Jin Liu, Xiaowan Su, Yuji Higo, Yoshinori Tange, Ho-kwang Mao, Tomoo Katsura
Summary: Mantele convection drives surface processes and chemical evolution, and phase transitions of minerals impact density and viscosity. Accurately determining the slopes of phase boundaries is crucial for understanding mantle dynamics.