Article
Geochemistry & Geophysics
Laura J. A. Rzehak, Sebastian Kommescher, Florian Kurzweil, Peter Sprung, Felipe P. Leitzke, Raul O. C. Fonseca
Summary: The equilibrium between Ti oxides and silicate melt leads to Ti isotope fractionation in terrestrial and lunar samples, with differences in valence potentially affecting Ti stable isotope fractionation during petrogenesis. Experimental results show redox-dependent Ti isotope fractionation during mare basalt petrogenesis, illustrating the importance of considering lunar environmental conditions in evaluating Ti isotope fractionation resulting from lunar magmatism.
CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
(2021)
Article
Materials Science, Ceramics
Gustavo Costa, Bryan J. Harder, Narottam P. Bansal, Jamesa L. Stokes, Kristina Lilova, Tamilarasan Subramani, Sergey Ushakov, Kevin J. Meisner, Alexandra Navrotsky
Summary: This paper summarizes the previous and current studies on using high-temperature calorimetry to investigate the energetics of reactions between ceramic coating materials and silicate melts in the CMAS system. The results suggest that the reactivity between the coating materials and the melt is influenced by the acid-base character and thermodynamic stability of the coating material. They also indicate that ceramic coating materials with less exothermic enthalpies of solution and mixing are less susceptible to CMAS melt corrosion when in contact with an acidic, polymerized melt rich in SiO2.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Multidisciplinary
Mariona Tarrago, Charles Le Losq, Thibaut Robine, Solenn Reguer, Dominique Thiaudiere, Daniel R. Neuville
Summary: In this study, experiments were conducted to investigate the valence state of titanium in silicate glasses under high temperatures and reduced conditions. It was found that titanium remained tetravalent and showed crystallization behavior instead of becoming trivalent. Furthermore, the use of reduced gas mixtures was explored as a novel method to induce surface crystallization and produce ceramic-coated glass materials.
Article
Geochemistry & Geophysics
Alina N. Koshlyakova, Alexander V. Sobolev, Stepan P. Krasheninnikov, Valentina G. Batanova, Alexander A. Borisov
Summary: The study presented the results of experiments focusing on the effects of Na2O and K2O on Ni-Mg partitioning between olivine and highly alkaline melts. The experimental data combined with literature pairs showed that Na2O and K2O have significant effects on the partitioning, with K having a more significant impact than Na. Other elements like Ti and Ca also affect the exchange equilibrium constant value, with Si increasing it.
Article
Geochemistry & Geophysics
Barbara Bonechi, Cristina Perinelli, Mario Gaeta, Alessandro Fabbrizio, Maurizio Petrelli, Ladislav Strnad
Summary: Experimental results show that with increasing temperature, the partition coefficients of LILEs, REEs, HFSEs, and TEs decrease, while increasing the aluminium content tetrahedrally coordinated. The growth rate also affects the partition coefficients, with higher value obtained at higher growth rates. Additionally, the NBO/T ratio of melts influence the partition coefficients.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2021)
Article
Geochemistry & Geophysics
Sha Chen, Peng Ni, Youxue Zhang, Joel Gagnon
Summary: This study reports trace element partition data between olivine and melt inclusions in lunar basalts and finds that, except for Li, V, and Cr, other elements show no significant difference in partitioning compared to terrestrial samples. The partition coefficient of Li between olivine and melt in low Mg# lunar basalts is higher than the published data for terrestrial samples. The partition coefficient of V in lunar basalts is significantly higher than that in terrestrial basalts, while the partition coefficient of Cr between olivine and basalt melt in the Moon is lower than those in terrestrial settings.
AMERICAN MINERALOGIST
(2022)
Article
Chemistry, Physical
Artem P. Tarutin, Stanislav A. Baratov, Dmitry A. Medvedev
Summary: Phases based on layered lanthanide nickelates are considered promising electrode materials for electrochemical devices. This study proposes a novel approach for the preparation of Pr2NiO4+delta-based materials, involving co-melting of initial nitrate components and high-temperature decomposition. The developed synthesis method enables the obtainment of highly dispersed and single-phase powders at a reduced synthesis temperature, opening new possibilities for cost-effective preparation of Ruddlesden-Popper oxide phases.
Article
Geochemistry & Geophysics
Julia Neukampf, Ben S. Ellis, Tomas Magna, Oscar Laurent, Yves Marrocchi
Summary: Evaluating the Li budget in volcanic deposits is crucial for understanding magmatic processes and Li deposit formation. Li concentrations in melt inclusions and re-entrants show little variation with tectonic setting but increase upon re-homogenization. The Li contents in mineral phases decrease in the order of biotite, plagioclase, clinopyroxene, and sanidine.
Article
Geochemistry & Geophysics
Michael C. Hutchinson, Richard A. Brooker, Jon D. Blundy, John H. Dilles, Charles T. Lewis
Summary: Anhydrite is increasingly recognized as a primary igneous phase and immiscible sulfate melts are found in high-temperature, sulfur-rich, arc magmas. This study presents partition coefficients for 37 trace elements between anhydrite, sulfate melt and silicate melt. The distribution of sulfate melt-silicate melt partition coefficients varies with ionic potential and peaks near the ionic potential of Ca and S. The composition of anhydrite suggests early crystallization near the liquidus of silicate melt.
AMERICAN MINERALOGIST
(2023)
Article
Geochemistry & Geophysics
Zhiwei He, Yuan Li, Zhenhui Hou, Fang Huang
Summary: The systematics of first-row transition elements (FRTE) and high field strength elements (HFSE) play an important role in tracking the source and evolution of mantle-derived magmas. Clinopyroxene is a crucial mineral for controlling the partitioning of trace elements between melt and solid during mantle melting. This study presents partitioning experiments of clinopyroxene-silicic melt system at various conditions and evaluates the effects of crystal chemistry and melt composition on the partitioning of FRTE and HFSE. The results provide valuable insights into the behavior of these elements in strongly polymerized silicic systems.
AMERICAN MINERALOGIST
(2023)
Article
Geosciences, Multidisciplinary
Raimundo Brahm, Georg F. Zellmer, Takeshi Kuritani, Daniel Coulthard, Mitsuhiro Nakagawa, Naoya Sakamoto, Hisayoshi Yurimoto, Eiichi Sato
Summary: Olivine-hosted melt inclusions are commonly used to study magmatic evolution, but their compositions can be affected by processes like post-entrapment crystallization, exsolution of volatile phases, and diffusive exchange with the host. A novel correction scheme has been developed to address situations where the original host crystal composition is not preserved, allowing for corrections in antecrystic hosts with varied temperature histories. This methodology also provides estimations of magmatic conditions during MI entrapment.
FRONTIERS IN EARTH SCIENCE
(2021)
Article
Multidisciplinary Sciences
Mingdong Zhang, Yuan Li
Summary: Laboratory measurements show non-Henry behavior in the partitioning of platinum and palladium as their concentrations increase in sulfide liquids, providing a reasonable explanation for the platinum and palladium systematics in Earth's mantle and mid-ocean ridge basalts when using partition coefficients in the range of 2,000-6,000. This suggests a need for reevaluation of platinum group element behavior when tracing planetary magmatic processes.
NATURE COMMUNICATIONS
(2021)
Article
Geosciences, Multidisciplinary
Eswaramoorthi Sellappa Gounder, Subramanian Sundaramurthy, Nagarajan Ramasamy, Periakali Palanivel
Summary: Sequential extraction of core samples from Pulicat Lake in India revealed that a significant portion of labile Cr and Al remain adsorbed onto Fe-Mn oxides or associated with organic matter. Cross-correlation and factor analysis helped identify key factors influencing the concentrations of Al and Cr in the labile fractions, providing valuable insights for interpreting palaeoenvironmental conditions.
GEOLOGICAL JOURNAL
(2021)
Article
Electrochemistry
Hong Zhang, Jianyue Jiao, Ao Zen, Enyue Zhao, Jinkui Zhao, Xiaoling Xiao
Summary: A Zr/Ti trace co-doping strategy is proposed to stabilize the structure of Li-rich Mn-based layered oxide cathodes, resulting in Li1.2Mn0.53Ni0.13Co0.13Zr0.005Ti0.005O2 with bulk phase disorder and surface Zr-enriched structures. This modified material exhibits higher specific capacity and excellent long-cycle performance, making it a promising candidate for commercial applications.
ELECTROCHIMICA ACTA
(2023)
Article
Geochemistry & Geophysics
Matthew J. Brzozowski, Iain M. Samson, Joel E. Gagnon, Robert L. Linnen, David J. Good
Summary: Magnetite-ilmenite intergrowths are common in mafic-ultramafic Ni-Cu-PGE systems, thought to form through fluid-induced oxidation by oxygen in water. This study reconsiders this model in light of low pO(2) in crustal fluids and the occurrence of intergrowths in unaltered rocks, showing potential significance of C in CO2 as an oxidizing agent. The chemical changes in Fe-Ti oxide intergrowths may impact interpretations of magmatic processes and mineral exploration.
MINERALIUM DEPOSITA
(2021)
Article
Geochemistry & Geophysics
Chunguang Wang, Mauro Lo Cascio, Yan Liang, Wenliang Xu
GEOCHIMICA ET COSMOCHIMICA ACTA
(2020)
Article
Geochemistry & Geophysics
Boda Liu, Yan Liang
GEOCHIMICA ET COSMOCHIMICA ACTA
(2020)
Article
Geochemistry & Geophysics
Yan Liang
EARTH AND PLANETARY SCIENCE LETTERS
(2020)
Article
Geochemistry & Geophysics
Leif Tokle, Greg Hirth, Yan Liang, Paul Raterron, Nick Dygert
Summary: The viscosity of ilmenite is influenced by pressure and Mg-content, with ilmenite40 showing larger stress exponent and activation volume than ilmenite100. Ilmenite100 has significantly lower viscosity compared to dry olivine under conditions representative of the early ilmenite-bearing cumulate. Lunar mantle overturn may be dominated by longer wavelength downwellings in a dry lunar mantle, and by shorter wavelength downwellings in a wet lunar mantle during initial overturn.
JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS
(2021)
Article
Geochemistry & Geophysics
D. P. Moriarty, R. N. Watkins, S. N. Valencia, J. D. Kendall, A. J. Evans, N. Dygert, N. E. Petro
Summary: The distribution of thorium in the South Pole-Aitken Basin is consistent with mantle-derived ejecta influenced by subsequent geologic events. Materials bearing thorium exhibit a titanium-bearing gabbronoritic composition consistent with globally distributed late lunar magma ocean cumulates. South Pole-Aitken impact melt is low-calcium pyroxene-rich and low-thorium, suggesting stratification in the upper mantle at the time of formation.
JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS
(2021)
Article
Geochemistry & Geophysics
Chunguang Wang, Yan Liang, Wenliang Xu
Summary: Amphibole-bearing rock sequences are formed through crystallization of partially reacted melts during cooling in experiments where basaltic andesite and basalt with 4 wt% water are juxtaposed against lherzolite at high temperature and pressure conditions.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Geochemistry & Geophysics
Yan Liang, Zejia Ji, Boda Liu
Summary: This study investigated the REE abundance in clinopyroxene and orthopyroxene in residual spinel peridotites to understand mantle processes. It concluded that deducing melting parameters from bulk peridotite samples is more reliable than from clinopyroxene alone, and highlighted the different susceptibility of HREE in clinopyroxene and LREE in orthopyroxene to subsolidus redistribution.
CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
(2021)
Article
Geochemistry & Geophysics
Megan D. Mouser, Nicholas Dygert, Brendan A. Anzures, Nadine L. Grambling, Rostislav Hrubiak, Yoshio Kono, Guoyin Shen, Stephen W. Parman
Summary: The study investigates the viscosity of Mercury's late-stage magma ocean analogue compositions, with and without sulfur, to understand the potential mantle structures. The presence of sulfur on Mercury's surface may have implications for the planet's mantle dynamics. The results suggest that different compositions have varying viscosities at different temperatures, which could influence the formation and evolution of Mercury's mantle.
JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS
(2021)
Article
Geochemistry & Geophysics
Nadine L. Grambling, Nicholas Dygert, Beau Boring, Marlon M. Jean, Peter B. Kelemen
Summary: We investigated the cooling histories of peridotites and gabbros from two different locations and found similar cooling rates, suggesting that hydrothermal cooling may play an important role in the crust-mantle transition zone.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Astronomy & Astrophysics
Jialong Ren, Marc A. Hesse, Michael P. Lucas, Nicholas Dygert
Summary: Recent observations indicate that there is rapid cooling at high temperatures in ordinary chondrite and primitive achondrite meteorite groups, suggesting fragmentation of their parent bodies near peak temperatures. Analyzing the conductive cooling of collisional fragments, we find that the actively cooling part of a fragment experiences similar cooling rates over a wide range of temperatures. This characteristic cooling rate decreases inversely with time, and larger fragments have longer cooling times. Applying this model to the cooling rates in H chondrites, we estimate cooling times of at least 10 to 10,000 years in fragments with radii of at least 102 to 103 meters.
Article
Geochemistry & Geophysics
F. Kourim, M. Rospabe, N. Dygert, S. Chatterjee, E. Takazawa, K. L. Wang, M. Godard, M. Benoit, M. Giampouras, K. Ishii, D. A. H. Teagle, M. J. Cooper, P. Kelemen
Summary: This study examines the compositions of ultramafic rocks in the Oman ophiolite to understand the formation processes of the crust-mantle transition zone and mantle sections. The results show two major trends in the trace element compositions, reflecting different geological processes.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Geochemistry & Geophysics
D. J. Cherniak, Y. Liang
Summary: This study characterizes the chemical diffusion of Ca in natural enstatite and explores its sensitivity to crystallographic orientation, oxygen fugacity, silica activity, and Ca concentration. The results show that Ca diffusion in enstatite is relatively insensitive to these factors, and the diffusion is slower than that of some other cations but faster than others. The obtained diffusion parameters are used to develop a model for the Ca-inopx thermometer and estimate the cooling rates of peridotites and pyroxenites.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Geochemistry & Geophysics
Yan Liang
Summary: Mixing in basalts is widely used to explain variations in radiogenic isotope ratios and highly incompatible trace elements. This study presents a new mixing model that considers the size, spatial location, and melting history of enriched and depleted mantle parcels. The results show that the compositions of pooled melt do not follow a single mixing curve, but instead define a mixing loop. Understanding these mixing processes is important for studying the chemical variations in mantle-derived melts.
JOURNAL OF PETROLOGY
(2022)
Article
Geochemistry & Geophysics
Megan D. Mouser, Nicholas Dygert
Summary: Mercury's surface displays diverse compositions, representing different periods of volcanic activity, suggesting diverse mantle source compositions. The formation of Mercury's juvenile mantle likely occurred after the solidification of a magma ocean, resulting in distinct mineralogical horizons. The mixing of materials from different mantle horizons is required to produce the observed volcanic terranes. Cumulate mantle overturn, where dense layers sink into less dense layers, could be a process responsible for dynamic mixing. The presence of sulfides on Mercury's surface could enhance or prevent the formation of gravitational instabilities. Analyzing mantle density and viscosity structures, the study evaluates the potential for cumulate mantle overturn in Mercury, predicting the timing, scale, and rate of overturn. The findings suggest that overturn within Mercury's mantle is possible within 100 million years of magma ocean solidification, influencing the formation of surface compositions and controlling the spatial scale of volcanic provinces.
JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS
(2023)
Article
Geochemistry & Geophysics
Xinze Lu, Geoffrey J. Gilleaudeau, Brian Kendall
Summary: The Late Ordovician mass extinction is the first major extinction event in the Phanerozoic, but the reasons for the decline in global biodiversity before the extinction are not well understood.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2024)
Article
Geochemistry & Geophysics
Junyao Kang, Daniel D. Gregory, Benjamin Gill, Shiqiang Huang, Changxin Lai, Zhaoshan Chang, Huan Cui, Ivan Belousov, Shuhai Xiao
Summary: Sedimentary pyrite is an important geological archive, but it can be altered by diagenetic and hydrothermal processes. This study successfully trained machine learning algorithms to distinguish pyrite origins using trace element data. The approach was validated and applied to identify the origins of pyrite in two sedimentary successions in South China.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2024)