Article
Geochemistry & Geophysics
Nicholas Arndt, Carole Cordier, Anne-Marie Boullier, Valentina Batanova, Valerie Magnin, Nathaniel Findling
Summary: Kimberlites contain olivine nodules with a wide range of Fo content. These nodules, regardless of their Fo content, have similar sizes, internal textures, and habits. They are believed to have a common origin with olivines in the megacryst suite, formed through interactions between mantle peridotite and CO2-rich fluid. This interaction occurred near the base of the lithosphere, not during kimberlite ascent.
JOURNAL OF PETROLOGY
(2022)
Article
Geochemistry & Geophysics
Jin-Sheng Zhou, Cheng-Cheng Huang, Qiang Wang, Zhong-Yuan Ren, Lin Ma, Lu-Lu Hao, Le Zhang
Summary: Constraints on mantle heterogeneity are crucial for understanding geochemical differentiation and recycling in the Earth's interior. This study provides insights into the mantle source of continental potassic alkali basalts through high-precision analyses of olivine phenocrysts and melt inclusions. The results suggest that the primary magmas were derived from a phlogopite-bearing pyroxenite source with peridotite residues, and the recycling of continental crustal material played a role in enriching the mantle source.
JOURNAL OF PETROLOGY
(2022)
Article
Geochemistry & Geophysics
Guoliang Zhang, Shuai Wang, Shichun Huang, Mingjun Zhan, Junhua Yao
Summary: The role of recycled carbonates in Hawaiian volcanism is studied by analyzing the compositions of lavas from different stages. It is found that the rejuvenated stage lavas contain a significant amount of CO2, indicating a CO2-rich mantle source. The temperature of the rejuvenated primary magma is similar to that of the shield stage, suggesting that the carbonated melts responsible for the rejuvenated stage lavas likely originated from the melting of carbonated peridotites in the plume. This study provides important insights into the contribution of recycled carbonates to volcanic activity.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2022)
Article
Geochemistry & Geophysics
Jing Wang, Ben-Xun Su, Paul T. Robinson, Yan Xiao, Yang Bai, Xia Liu, Patrick Asamoah Sakyi, Jie-Jun Jing, Chen Chen, Zi Liang, Zhi-An Bao
Summary: The study examined the trace elements in olivine and found differences in trace element contents and ratios among different types of mafic-ultramafic rocks, which can be used as chemical proxies to distinguish the origin and evolution processes of the rocks.
Article
Food Science & Technology
Xiuxiu Wu, Tianyi Guo, Feijun Luo, Qinlu Lin
Summary: Brown rice is a traditional health food with various active substances that have preventive and therapeutic effects on many diseases. This review systematically summarizes the efficacy of brown rice on cardiovascular diseases, hyperlipidemia, hypertension, diabetes, obesity, osteoporosis, neurodegenerative diseases, cancer, immune disorders, inflammation, anxiety, liver and stomach damage. It also analyzes the underlying mechanisms.
FOOD SCIENCE AND HUMAN WELLNESS
(2023)
Article
Multidisciplinary Sciences
Yu Wang, Stephen F. Foley, Stephan Buhres, Jeremie Soldner, Yigang Xu
Summary: Potassium-rich volcanism occurring throughout the Alpine-Himalayan belt from Spain to Tibet is characterized by unusually high Th/La ratios, which may be attributed to a new mantle lithosphere formed only 20 to 50 million years earlier at shallow depths without deep subduction of continental materials. This mechanism is consistent with a temporal trend in Th/La in potassic postcollisional magmas, indicating shallow sources in accretionary settings.
Article
Geochemistry & Geophysics
Gong-Jian Tang, Derek A. Wyman, Qiang Wang, Lin Ma, Wei Dan, Ya-Nan Yang, Xi-Jun Liu, Hong-Yi Chen
Summary: Tibetan Cenozoic syn-collisional potassic-ultrapotassic igneous rocks provide valuable insights into the processes and origins of metasomatism in the upper mantle, as well as continental subduction and plateau uplift. This study examines the oxygen isotopes and major/trace elements of olivine in these rocks and mantle xenoliths from the western Kunlun area, and finds evidence of crustal recycling and mantle metasomatism. The results suggest that the high-delta O-18 signature in the potassic-ultrapotassic rocks reflects the nature of the primary melts and their source region, while the mantle xenoliths have been highly metasomatized by silicate materials from recycled Indian continental crust.
CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
(2022)
Article
Geochemistry & Geophysics
Sally Law, Geoffrey D. Bromiley, Geoff N. Kilgour, J. Godfrey Fitton
Summary: This study investigated the olivine compositions of mafic eruptions in the Taupo Volcanic Zone in New Zealand, revealing different mantle sources and the impact of olivine compositions on volcanic activity in the TVZ. Olivines from the south TVZ are derived from harzburgite, while those from the central TVZ are lherzolite-derived, which may be related to different petrological characteristics and volcanic activities.
Article
Geosciences, Multidisciplinary
Wenqing Sun, Lidong Dai, Haiying Hu, Mengqi Wang, Ziming Hu, Chenxin Jing
Summary: The electrical structures of the Earth's upper mantle are influenced by the ilmenite contents in the olivine-ilmenite systems. Conductivity increases with temperature and slightly with pressure. Interconnected ilmenites greatly enhance the conductivities of the system.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Geochemistry & Geophysics
Christian Veglio, Bruce A. A. Kjarsgaard, Duane C. C. Petts, Simon E. E. Jackson, Christopher J. M. Lawley, D. Graham Pearson
Summary: This study analyzed mantle samples from the northern Slave craton in Canada and found significant variations in element concentrations and mineral compositions in harzburgite xenoliths and olivine xenocrysts, which may be attributed to the interaction with carbonatitic and ultramafic silicate melts. With the exception of a few elements, most trace elements in olivine do not vary systematically with depth and are more likely influenced by fluid, sulphides, and mineral inclusions.
Article
Geochemistry & Geophysics
Yuval Boneh, Emily J. Chin, Greg Hirth
Summary: By studying a sheared peridotite xenolith deformed under comparable strain rates to laboratory shearing time scales, variations in microstructure between monophase and multiphase bands were observed, shedding light on the rheological properties of the upper mantle. The microstructure analysis revealed a dominant and secondary activated crystallographic preferred orientation in olivine grains, along with deformation mechanisms involving dislocation creep and dynamic recrystallization. The reduction of grain size in orthopyroxene was found to promote activation of diffusion creep, indicating a high activation volume for wet orthopyroxene dislocation creep.
Article
Geochemistry & Geophysics
Hangshan Lei, Zhidan Zhao, Qian Ma, Fang-Zhen Teng, Shuangquan Zhang, Brian Cousens, Dong Liu, Di-Cheng Zhu, Qing Wang, Zhuang Miao, Yiyun Yang, Jingkai Wu
Summary: Paleogene potassium-rich volcanic rocks (PVRs) in the southeastern Tibetan Plateau are studied to understand their petrogenesis and geodynamic mechanism. The PVRs are found to originate from enriched lithospheric mantle, possibly replenished by a hybrid carbonate-silicic sediment. The formation of these volcanic rocks is closely associated with the delamination of the thickened lithosphere and asthenosphere upwelling.
Article
Geochemistry & Geophysics
Z. J. Sudholz, G. M. Yaxley, A. L. Jaques, J. Chen
Summary: The study presents new synthesis experiments conducted in the temperature-dependent exchange of Ni and Mg between garnet and olivine, resulting in an updated Ni-in-garnet geothermometer for more reliable temperature estimates in the upper mantle and kimberlite diamond potential. The calibration can be applied to garnet peridotite xenoliths or monomineralic garnet xenocrysts, offering a more accurate understanding of mantle temperatures and geological processes related to diamond formation.
CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
(2021)
Article
Geochemistry & Geophysics
Lin Wang, Artem Chanyshev, Nobuyoshi Miyajima, Takaaki Kawazoe, Stephan Blaha, Jia Chang, Tomoo Katsura
Summary: This study investigates the effect of water content on upper mantle dynamics by measuring the annihilation rate coefficients of a-dislocations and c-dislocations in olivine. The results suggest that water has a limited overall effect on dislocation mobility and does not effectively increase the dislocation creep rate. Additionally, a water-induced fabric transition is unlikely to occur.
EARTH AND PLANETARY SCIENCE LETTERS
(2022)
Article
Astronomy & Astrophysics
Marco Veneranda, Guillermo Lopez-Reyes, Elena Pascual Sanchez, Agata M. Krzesinska, Jose Antonio Manrique-Martinez, Aurelio Sanz-Arranz, Cateline Lantz, Emmanuel Lalla, Andoni Moral, Jesus Medina, Francois Poulet, Henning Dypvik, Stephanie C. Werner, Jorge L. Vago, Fernando Rull
Summary: The study evaluated the efficiency of the ExoMars Raman laser spectrometer (RLS) in determining the degree of serpentinization of olivine-rich units on Mars. The RLS successfully identified major phases and also detected minor compounds not observed by other analytical instruments. Calibration curves were created to estimate the relative content of olivine and serpentine in the samples, showing the effectiveness of RLS in identifying serpentine, which is crucial for potential biosignature detection on Mars.
Article
Geosciences, Multidisciplinary
Jiten Pattnaik, Sylvie Demouchy, Sujoy Ghosh
Summary: This study reports the first hydrogen concentrations in mantle minerals from the Eastern Dharwar craton in India, with olivine, pyroxenes, and garnet showing different levels of water content. The variable hydrogen concentrations in garnet may be influenced by nano-scale inclusions. The reconstructed hydrogen bulk concentrations in Dharwar peridotites are lower than those estimated for the lithospheric mantle, suggesting a possible relationship to proto-kimberlite melts with low water activity.
PRECAMBRIAN RESEARCH
(2021)
Article
Multidisciplinary Sciences
Vahid Samae, Patrick Cordier, Sylvie Demouchy, Caroline Bollinger, Julien Gasc, Sanae Koizumi, Alexandre Mussi, Dominique Schryvers, Hosni Idrissi
Summary: The mechanical properties of olivine-rich rocks are crucial for understanding the mechanical coupling between Earth's lithosphere and asthenosphere. Additional deformation mechanisms are required in olivine due to the lack of slip systems, with current lack of consensus on the mechanisms of grain-boundary sliding in olivine. This proposed mechanism of grain-boundary mobility triggering plastic processes in olivine-rich rocks could be significant in high-stress deep Earth conditions.
Article
Microscopy
Clement Ernould, Benoit Beausir, Jean-Jacques Fundenberger, Vincent Taupin, Emmanuel Bouzy
Summary: This article introduces an integrated correction of optical distortions for global HR-EBSD/HR-TKD approaches, which applies digital image correlation analysis directly to optically distorted patterns, avoiding the pattern pre-processing step while preserving numerical efficiency.
Article
Materials Science, Multidisciplinary
Kaustubh Venkatraman, Meriem Ben Haj Slama, Vincent Taupin, Nabila Maloufi, Antoine Guitton
Summary: A novel method for automated slip trace detection and analysis based on the Hough transform algorithm is introduced, applied to electron channeling contrast imaging micrographs. By automating the determination of slip-trace crystallography and analyzing multiple regions of interest on a beta-Ti21S sample, it was found that most slip traces belong to the {112} and {123} slip families. The study also compared experimentally observed slip distribution statistics with a simulated plasticity response using a crystal plasticity model.
MODELLING AND SIMULATION IN MATERIALS SCIENCE AND ENGINEERING
(2021)
Article
Materials Science, Multidisciplinary
N. Bieberdorf, V Roytershteyn, A. Villani, V Taupin, L. Capolungo, A. Antoniou
Summary: This study explores the feasibility of using Digital Image Correlation (DIC) to characterize realistic strain fields in polycrystalline metals, finding that DIC is capable of obtaining accurate strain fields that closely match simulation results. The accuracy of DIC analysis depends on the subset window size, suggesting potential improvements to standard algorithms for quantitative model-data comparison.
EXPERIMENTAL MECHANICS
(2022)
Article
Nanoscience & Nanotechnology
Julien Guenole, Vincent Taupin, Maxime Vallet, Wenbo Yu, Antoine Guitton
Summary: Complex intermetallic materials called MAX phases have unique properties due to their nanolayered structure. We studied the atomic features of a nano-twist phase in Ti3AlC2 using high-resolution scanning transmission electron microscopy and atomistic modeling. We found that air-oxidation at 1000℃ can produce a twisted phase and lead to the formation of interfacial dislocation networks or severe interfacial reconstructions. We also investigated the impact of the twist defect on the stress field in the Ti3AlC2 bulk phase.
SCRIPTA MATERIALIA
(2022)
Article
Materials Science, Multidisciplinary
Marie Landeiro Dos Reis, Yvelin Giret, Philippe Carrez, Patrick Cordier
Summary: This study investigates the mechanisms of pipe diffusion and point defect diffusion along dislocation line in MgO. Through numerical calculations and the use of elasticity theory, the migration energies of point defects are determined. The diffusion kinetics near the dislocation is evaluated using an on-lattice atomistic kinetic Monte Carlo algorithm based on atomistic simulations. The study reveals that the edge dislocation in MgO acts as a strong sink for vacancies, leading to enhanced diffusion of point defects near the dislocation.
COMPUTATIONAL MATERIALS SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Nina Daneu, Goran Drazic, Matjaz Mazaj, Fabrice Barou, Jose Alberto Padron-Navarta
Summary: Contact and multiple cyclic twins of cassiterite commonly form in SnO2-based ceramics when SnO2 is sintered with small additions of cobalt and niobium oxides. The formation of twins is a two-stage process that starts with epitaxial growth on CoNb2O6 and Co4Nb2O9 seeds, and continues with the fast growth of twin contacts. The twins are structurally related to the rutile-type cassiterite and can trigger oriented growth of SnO2 domains. The densification process and SnO2 grain growth are controlled by solid-state diffusion, leading to the dissolution of twin nuclei and the incorporation of Nb5+ and Co2+ ions into the SnO2 matrix.
ACTA CRYSTALLOGRAPHICA SECTION B-STRUCTURAL SCIENCE CRYSTAL ENGINEERING AND MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Hosni Idrissi, Armand Beche, Nicolas Gauquelin, Ihtasham Ul-Haq, Caroline Bollinger, Sylvie Demouchy, Johan Verbeeck, Thomas Pardoen, Dominique Schryvers, Patrick Cordier
Summary: Intragranular amorphization shear lamellae are observed in deformed olivine aggregates, and their formation and propagation are associated with crystal defects and rotational nanodomains. Hence, stress-induced amorphization in olivine is a result of a direct crystal-to-amorphous transformation caused by shear instability, rather than mechanical destabilization.
Article
Geosciences, Multidisciplinary
Hafiz U. Rehman, David Mainprice, Fabrice Barou, Hiroshi Yamamoto, Chunjing Wei, Tehseen Zafar, Tahseenullah Khan
Summary: This study reports on the application of Electron backscattered diffraction (EBSD) and crystallographic preferred orientations (CPO) in investigating the deformation regimes during subduction and exhumation of high- and ultrahigh-pressure eclogites in the Himalayas. The EBSD data reveal a dominant L-type CPO in omphacites, indicating constrictional strain during peak eclogite facies conditions. The garnets show a complex fabric, suggesting rigid behavior in the presence of omphacite. Quartz grains display irregular CPO in high-pressure eclogites, but a relatively strong fabric in ultrahigh-pressure eclogites. The EBSD data of rutile indicate coeval deformation with omphacite, while titanite exhibits a random CPO different from rutile. Hornblende shows an identical fabric to omphacite, suggesting topotactic replacement during exhumation.
JOURNAL OF STRUCTURAL GEOLOGY
(2023)
Article
Multidisciplinary Sciences
Patrick Cordier, Karine Gouriet, Timmo Weidner, James Van Orman, Olivier Castelnau, Jennifer M. Jackson, Philippe Carrez
Summary: Heat transport from Earth's interior drives convection in the mantle, involving solid rock deformation over billions of years. The lower mantle is composed of iron-bearing bridgmanite MgSiO3 and periclase MgO (also with some iron). Recent studies have focused on representing lower mantle assemblages under relevant pressure and temperature conditions. However, the natural strain rates are significantly lower than in the laboratory, making them inaccessible. This study uses numerical modeling to determine the rheological properties of MgO periclase at lower mantle conditions, showing that periclase deformation is much slower than bridgmanite deformation due to slow oxygen diffusion.
Article
Geosciences, Multidisciplinary
Jennifer M. Taylor, Christian Teyssier, Donna L. Whitney, Rory R. McFadden, Fabrice Barou
Summary: A novel method combining microstructural analysis and Ti-in-quartz measurements is used to characterize interactions between quartz deformation and Ti equilibration in a mylonitic shear zone. Quartzite from the Wildhorse detachment in Idaho, USA, contains different microstructures: relict grains, quartz ribbons, and a subgrain rotation recrystallization matrix. Correlation between quartz microstructure and Ti concentration is achieved using EBSD, EPMA, and cathodoluminescence imaging. High Ti concentration suggests high temperatures, while low Ti concentration reflects equilibration at lower temperatures. The preservation of multiple microstructures with distinct Ti concentrations facilitates understanding of the linked history of deformation and Ti equilibration during cooling.
JOURNAL OF STRUCTURAL GEOLOGY
(2023)
Article
Mineralogy
Sylvie Demouchy, Manuel Thieme, Fabrice Barou, Benoit Beausir, Vincent Taupin, Patrick Cordier
Summary: In this study, the geometrically necessary dislocation density (rho(c)(alpha)) and disclination density (rho(theta)) in fine-grained polycrystalline olivine were quantified under various deformation conditions. The spatial distribution of both GND and disclination densities were obtained using ATEX software. The results showed that sub-grain boundaries were defined by areas with the highest GND densities, and most olivine sub-grain boundaries had a mixed character. Disclinations were found along grain boundaries, sub-grain boundaries, and at sub-grain boundary tips.
EUROPEAN JOURNAL OF MINERALOGY
(2023)