Article
Engineering, Marine
Yuxiang Zhang, Zuxing Chen, Zhigang Zeng
Summary: Submarine volcanic eruptions pose a threat to marine environments and resources. Magma mixing is an important factor in triggering volcanic eruptions. This study estimated the timescale of magma mixing and found that andesitic magma had a short residence time (0.1-0.3 years), while rhyolitic magma had a longer residence time (80-120 years). Efficient magma mixing allowed andesites to erupt, explaining their rarity in basalt-rhyolite dominant settings. However, rapid magma mixing and eruption negatively impact the development and preservation of seafloor hydrothermal resources. Thus, the stability of sub-seafloor magma systems should be evaluated in the assessment of seafloor sulfide resources and mining prospects.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Multidisciplinary Sciences
Lea Ostorero, Georges Boudon, Helene Balcone-Boissard, Daniel J. Morgan, Thiebaut d'Augustin, Clara Solaro
Summary: Dominica, an island with four active volcanoes, likely hosts a well-established transcrustal mush system, with interactions between different magmatic environments observed before five pumiceous eruptions in the past 24 thousand years. The study suggests that reactivation signals could be detected several years prior to future eruptions, which has significant implications for volcanic risk mitigation.
SCIENTIFIC REPORTS
(2021)
Article
Geochemistry & Geophysics
R. Lukacs, L. Caricchi, A. K. Schmitt, O. Bachmann, O. Karakas, M. Guillong, K. Molnar, I Seghedi, Sz Harangi
Summary: Research on Ciomadul volcano shows that it has long-term existence of high-crystallinity magma, with zircon age analysis indicating the magma has remained in a highly crystalline mush state for millions of years. Model calculations suggest a low average rate of magma input, but a considerable crystal mush zone is still present within the magma reservoir, indicating the volcano still has the potential for eruption.
EARTH AND PLANETARY SCIENCE LETTERS
(2021)
Article
Geochemistry & Geophysics
Vojtech Patocka, Nicola Tosi, Enrico Calzavarini
Summary: The dynamic behavior of crystals in convecting fluids has significant implications for the solidification of magma bodies. Researchers have conducted numerical studies to investigate the dynamics of particle-laden convection and have developed a robust model to predict the residence time of particles. The study reveals that the particle trajectories undergo a transition from fluid tracer-like to free-fall dynamics, depending on the ratio between particle Stokes velocity and the mean amplitude of the fluid velocity. The settling rates and residence time distribution of particles differ depending on the Rayleigh numbers. The findings emphasize the importance of using three-dimensional simulations to accurately capture the flow-particle interaction in particle-laden flows.
EARTH AND PLANETARY SCIENCE LETTERS
(2022)
Article
Geochemistry & Geophysics
Qiang Zhang, Zhaochong Zhang, Zhiguo Cheng, M. Santosh, Zhenchao Wang, Shengkai Jin
Summary: This study evaluates the formation of porphyry Mo deposits in the Central Asian Orogenic Belt, with a focus on the role of large volume magma chambers, the relationship between quartz types and sulfur content, and the timescales of magma evolution and hydrothermal processes. Large magma chambers are found to be essential for the formation of these deposits, with relatively short timescales for hydrothermal fluid processes compared to magma evolution.
Article
Chemistry, Multidisciplinary
Fernaldo Richtia Winnerdy, Blaz Bakalar, Poulomi Das, Brahim Heddi, Adrien Marchand, Frederic Rosu, Valerie Gabelica, Anh Tuan Phan
Summary: This study reported the first observation of extremely long-lived K+ and NH4+ ions at the center of a left-handed G-quadruplex DNA. It was found that a single-base mutation could affect this long-lived behavior of the central cation.
Article
Geochemistry & Geophysics
Zachary A. Torrano, Devin L. Schrader, Jemma Davidson, Richard C. Greenwood, Daniel R. Dunlap, Meenakshi Wadhwa
Summary: Based on the isotopic compositions of Ti, Cr, and O, the study suggests that CM, CO, and ungrouped carbonaceous chondrites likely originated from multiple distinct parent bodies, formed from precursor materials with similar isotopic compositions, potentially indicating close proximity in regions of the protoplanetary disk.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2021)
Article
Geochemistry & Geophysics
L. Kraemer Ruggiu, B. Devouard, J. Gattacceca, L. Bonal, H. Leroux, J. Eschrig, D. Borschneck, A. J. King, P. Beck, Y. Marrocchi, V. Debaille, R. D. Hanna, O. Grauby
Summary: This study investigates the detection of aqueous alteration in carbonaceous chondrites using different techniques. The results show that the assessment of primitivity in chondrites is highly dependent on the methods used. Combining X-ray diffraction and transmission electron microscopy allows for the detection of both primary and secondary phases, making it an ideal method for characterizing primitive chondrites and studying incipient aqueous alteration.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Engineering, Chemical
Saeed Mahdavy, Hamid Reza Norouzi, Christian Jordan, Bahram Haddadi, Michael Harasek
Summary: This study characterizes the motion of non-spherical particles with sharp edges using residence time distribution (RTD) measurement in a continuous drum. The effects of rotation speed, incline angle, feed rate, and mixture composition on the RTD were investigated. The study also found that the average residence time of particles with sharp edges depends on rotation speed and incline angle, while the effects of feed rate and particle size are minimal.
Article
Pharmacology & Pharmacy
Shashank Venkat Muddu, Lalith Kotamarthy, Rohit Ramachandran
Summary: This work presents a new approach to estimate residence time metrics in twin screw wet granulation through semi-mechanistic relations, which have been tested for validity across different datasets.
Article
Engineering, Chemical
Ran Feng, Sylvain Barjon, Frans W. J. van den Berg, Soren Kristian Lillevang, Lilia Ahrne
Summary: This study identified the relationships between processing parameters and cheese functionality, with cooking residence time (CRT) significantly impacting cheese properties more than stretching residence time (SRT). Residence times were linked to cheese composition, structural characteristics, and functional properties, making CRT and SRT promising factors for understanding and controlling mozzarella cheese characteristics during manufacture.
JOURNAL OF FOOD ENGINEERING
(2021)
Article
Biodiversity Conservation
Liyuan He, Xiaofeng Xu
Summary: Soil microbes play a crucial role in carbon cycling, with their residence time affecting the mineralization of soil organic carbon. Through extensive data analysis and modeling, it was found that microbial residence time varies significantly among different biomes, influenced by climate, vegetation, and soil factors.
GLOBAL CHANGE BIOLOGY
(2021)
Article
Environmental Sciences
Xinghua Li, Kaiqiang Yang, Zihao Wang, Yan Xie, Philip K. Hopke, Xiang Li, Chunyu Xue
Summary: Household biofuel burning is a major source of PM2.5, BC, and OC emissions globally. Dilution sampling is commonly used to study PM2.5 emissions, but the residence time in the dilution chamber remains poorly characterized for biomass combustion. This study investigated the effects of residence time on PM2.5 emissions from a Chinese household stove burning typical biofuels, finding that a residence time of 1-80 s did not significantly affect emission factors. Both measurement and theoretical simulations suggested that dilution sampling with a short residence time can provide reliable results for PM2.5 emissions from biofuel burning in specific experimental conditions.
Article
Engineering, Chemical
Ariane Berard, Bruno Blais, Gregory S. Patience
Summary: RTD method can effectively detect hydrodynamic anomalies in reactors, including the impact of gas diffusivity and intraparticle porosity on residence time. The experimental results suggest that gas diffusivity and particle characteristics should be considered when selecting tracer gases.
ADVANCED POWDER TECHNOLOGY
(2021)
Article
Engineering, Chemical
Mingheng Li
Summary: This study utilizes Computational Fluid Dynamics (CFD) to analyze the residence time distribution (RTD) in a commercial RO channel and finds differences from analytical solutions for flat channels, primarily due to the existence of spacer filaments in the RO channel. Experimental results show the purging efficiency after one displacement volume.
Article
Geochemistry & Geophysics
Man Xu, Zhicheng Jing, Tony Yu, E. Ercan Alp, Barbara Lavina, James A. Van Orman, Yanbin Wang
Summary: Iron-rich silicate melts have been studied for their elastic properties, specifically sound velocities, at high pressure and temperature conditions. The results show that iron can reduce sound velocity while increasing density of silicate melts. The study also found that although density of the melts can be described by a linear mixing law empirically, sound velocities do not vary with composition linearly.
EARTH AND PLANETARY SCIENCE LETTERS
(2022)
Article
Geochemistry & Geophysics
E. T. Dunham, M. Wadhwa, S. J. Desch, M. C. Liu, K. Fukuda, N. Kita, A. T. Hertwig, R. L. Hervig, C. Defouilloy, S. B. Simon, J. Davidson, D. L. Schrader, Y. Fujimoto
Summary: Short-lived radionuclides (SLRs) provide information about the formation environment of our Solar System, and the measurement of 10Be-10B isotope systematics in calcium-aluminum-rich inclusions (CAIs) reveals a uniform initial 10Be/9Be ratio of (7.1 ± 0.2) x 10-4, suggesting the predominant inheritance of 10Be from the molecular cloud in the Solar System.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Geochemistry & Geophysics
Maria Rosa Scicchitano, Romain Lafay, John W. Valley, Noriko T. Kita, William O. Nachlas
Summary: The study of serpentinites and ophicarbonates from ophiolitic terrains provides insights into the hydration and carbonation processes of modern oceanic lithosphere. The Chenaillet ophiolite in the western Alps, resembling a slow spreading center, was weakly affected by metamorphism. In this study, in situ analysis of oxygen and carbon isotopes in different minerals was conducted to understand the formation processes of ophicarbonates in the Chenaillet ophiolite. The results identify multiple stages of alteration and provide evidence for protracted serpentinization and carbonation similar to modern mid-ocean ridge venting systems.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Geochemistry & Geophysics
Kohei Fukuda, Travis J. Tenner, Makoto Kimura, Naotaka Tomioka, Guillaume Siron, Takayuki Ushikubo, Noel Chaumard, Andreas T. Hertwig, Noriko T. Kita
Summary: Deciphering the spatial and temporal evolution of chondrules allows for a better understanding of the formation, migration, and accretion processes of asteroidal seeds. In this study, high precision Al-Mg ages and oxygen three-isotope ratios of chondrules from CM and CO carbonaceous chondrites were reported, revealing differences in formation time and migration processes between chondrules in the inner and outer Solar System.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Geochemistry & Geophysics
Guillaume Siron, Kohei Fukuda, Makoto Kimura, Noriko T. Kita
Summary: In this study, the formation timing of chondrules in ordinary chondrites was investigated through high precision Al-Mg chronology and detailed petrology and oxygen isotope analysis. The results indicate that chondrules in ordinary chondrites have a formation age range of approximately 1.8 Ma to 2.2 Ma, and there is no significant difference in the formation timing between L and LL chondrites. These findings provide important insights into the environments and processes involved in the formation of ordinary chondrite chondrules.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Geochemistry & Geophysics
G. J. MacPherson, A. N. Krot, N. T. Kita, E. S. Bullock, K. Nagashima, T. Ushikubo, M. A. Ivanova
Summary: The evolution of CAIs into Type B inclusions presents a new solar nebula model, different from the conventional condensation model, with the formation of pyroxene and anorthite influenced by the addition of silicon from the gas and reaction with melilite, respectively.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Geochemistry & Geophysics
Shigeko Togashi, Akihiko Tomiya, Noriko T. Kita, Yuichi Morishita
Summary: This study estimated the composition of host magmas in the Procellarum KREEP Terrane (PKT) and proposed a three-stage evolution model to explain the origin of KREEP-rich component and the evolutionary process of magmas in the PKT region.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Geochemistry & Geophysics
Maria Rosa Scicchitano, Michael C. Jollands, Ian S. Williams, Joerg Hermann, Daniela Rubatto, Noriko T. Kita, William O. Nachlas, John W. Valley, Stephane Escrig, Anders Meibom
Summary: Knowledge of oxygen diffusion in garnet is crucial for understanding oxygen isotope signatures in natural samples. This study conducted a series of experiments to determine the diffusivity of oxygen in garnet. The results suggest that oxygen diffuses in garnet via two distinct pathways, with an inter-site reaction allowing oxygen to move between these pathways. The diffusivity of oxygen in garnet is influenced by the chemical composition of the garnet. The slow mechanism is prevalent in natural garnets and likely controls the preservation of oxygen isotope signatures. Additionally, the diffusion of oxygen in garnet is low, especially at lower temperatures.
AMERICAN MINERALOGIST
(2022)
Article
Astronomy & Astrophysics
Jens Barosch, Larry R. Nittler, Jianhua Wang, Conel M. O'D Alexander, Bradley T. De Gregorio, Cecile Engrand, Yoko Kebukawa, Kazuhide Nagashima, Rhonda M. Stroud, Hikaru Yabuta, Yoshinari Abe, Jerome Aleon, Sachiko Amari, Yuri Amelin, Ken-ichi Bajo, Laure Bejach, Martin Bizzarro, Lydie Bonal, Audrey Bouvier, Richard W. Carlson, Marc Chaussidon, Byeon-Gak Choi, George D. Cody, Emmanuel Dartois, Nicolas Dauphas, Andrew M. Davis, Alexandre Dazzi, Ariane Deniset-Besseau, Tommaso Di Rocco, Jean Duprat, Wataru Fujiya, Ryota Fukai, Ikshu Gautam, Makiko K. Haba, Minako Hashiguchi, Yuki Hibiya, Hiroshi Hidaka, Hisashi Homma, Peter Hoppe, Gary R. Huss, Kiyohiro Ichida, Tsuyoshi Iizuka, Trevor R. Ireland, Akira Ishikawa, Motoo Ito, Shoichi Itoh, Kanami Kamide, Noriyuki Kawasaki, A. L. David Kilcoyne, Noriko T. Kita, Kouki Kitajima, Thorsten Kleine, Shintaro Komatani, Mutsumi Komatsu, Alexander N. Krot, Ming-Chang Liu, Zita Martins, Yuki Masuda, Jeremie Mathurin, Kevin D. McKeegan, Gilles Montagnac, Mayu Morita, Smail Mostefaoui, Kazuko Motomura, Frederic Moynier, Izumi Nakai, Ann N. Nguyen, Takuji Ohigashi, Taiga Okumura, Morihiko Onose, Andreas Pack, Changkun Park, Laurette Piani, Liping Qin, Eric Quirico, Laurent Remusat, Sara S. Russell, Naoya Sakamoto, Scott A. Sandford, Maria Schonbachler, Miho Shigenaka, Hiroki Suga, Lauren Tafla, Yoshio Takahashi, Yasuo Takeichi, Yusuke Tamenori, Haolan Tang, Kentaro Terada, Yasuko Terada, Tomohiro Usui, Maximilien Verdier-Paoletti, Sohei Wada, Meenakshi Wadhwa, Daisuke Wakabayashi, Richard J. Walker, Katsuyuki Yamashita, Shohei Yamashita, Qing-Zhu Yin, Tetsuya Yokoyama, Shigekazu Yoneda, Edward D. Young, Hiroharu Yui, Ai-Cheng Zhang, Masanao Abe, Akiko Miyazaki, Aiko Nakato, Satoru Nakazawa, Masahiro Nishimura, Tatsuaki Okada, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Yuichi Tsuda, Sei-ichiro Watanabe, Toru Yada, Kasumi Yogata, Makoto Yoshikawa, Tomoki Nakamura, Hiroshi Naraoka, Takaaki Noguchi, Ryuji Okazaki, Kanako Sakamoto, Shogo Tachibana, Hisayoshi Yurimoto
Summary: Researchers have discovered presolar grains in samples returned from asteroid Ryugu, which have isotopic compositions similar to those found in carbonaceous chondrite meteorites. This finding provides further evidence of the connection between Ryugu and carbonaceous CI chondrites, and also suggests the presence of small-scale heterogeneities in the Ryugu samples.
ASTROPHYSICAL JOURNAL LETTERS
(2022)
Article
Geosciences, Multidisciplinary
Man Xu, Zhicheng Jing, James A. Van Orman, Tony Yu, Yanbin Wang
Summary: Research has discovered the existence of a partially molten layer within the Moon's interior, composed mainly of melted iron-titanium material. This molten layer may have formed during the late stages of the lunar magma ocean and has remained stable until the present day, significantly influencing the thermochemical evolution of the Moon's mantle.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geochemistry & Geophysics
Mingming Zhang, Kohei Fukuda, Michael J. Spicuzza, Guillaume Siron, Adriana Heimann, Alex J. Hammerstrom, Noriko T. Kita, Takayuki Ushikubo, John W. Valley
Summary: The instrumental bias of oxygen isotopes in SIMS analysis of olivine and pyroxene was investigated using different reference materials. The bias values remained nearly invariant for magnesian olivine but decreased with increasing iron content. Orthopyroxene and clinopyroxene showed narrower ranges of bias values. The new dataset allowed for the identification of two oxygen isotope trends and offered insights into the early solar system.
Article
Geochemistry & Geophysics
G. J. MacPherson, J. Beckett, N. T. Kita, K. Nagashima, A. N. Krot, J. Fournelle, L. Koop, A. T. Hertwig, T. R. Rose, A. M. Davis
Summary: We synthesized three compositions of hibonite to evaluate its suitability as a standard for SIMS analysis. Our results showed that the terrestrial hibonite gives similar results to synthetic samples when properly characterized. The RSFs for the synthetic hibonite and combined synthetic and Madagascar hibonite analyses were determined to be 0.779 +/- 0.003 and 0.777 +/- 0.003, respectively.
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
Astronomy & Astrophysics
Marine Paquet, Frederic Moynier, Tetsuya Yokoyama, Wei Dai, Yan Hu, Yoshinari Abe, Jerome Aleon, Conel M. O'D. Alexander, Sachiko Amari, Yuri Amelin, Ken-ichi Bajo, Martin Bizzarro, Audrey Bouvier, Richard W. Carlson, Marc Chaussidon, Byeon-Gak Choi, Nicolas Dauphas, Andrew M. Davis, Tommaso Di Rocco, Wataru Fujiya, Ryota Fukai, Ikshu Gautam, Makiko K. Haba, Yuki Hibiya, Hiroshi Hidaka, Hisashi Homma, Peter Hoppe, Gary R. Huss, Kiyohiro Ichida, Tsuyoshi Iizuka, Trevor R. Ireland, Akira Ishikawa, Motoo Ito, Shoichi Itoh, Noriyuki Kawasaki, Noriko T. Kita, Kouki Kitajima, Thorsten Kleine, Shintaro Komatani, Alexander N. Krot, Ming-Chang Liu, Yuki Masuda, Kevin D. McKeegan, Mayu Morita, Kazuko Motomura, Izumi Nakai, Kazuhide Nagashima, David Nesvorny, Ann N. Nguyen, Larry Nittler, Morihiko Onose, Andreas Pack, Changkun Park, Laurette Piani, Liping Qin, Sara S. Russell, Naoya Sakamoto, Maria Schoenbaechler, Lauren Tafla, Haolan Tang, Kentaro Terada, Yasuko Terada, Tomohiro Usui, Sohei Wada, Meenakshi Wadhwa, Richard J. Walker, Katsuyuki Yamashita, Qing-Zhu Yin, Shigekazu Yoneda, Edward D. Young, Hiroharu Yui, Ai-Cheng Zhang, Tomoki Nakamura, Hiroshi Naraoka, Takaaki Noguchi, Ryuji Okazaki, Kanako Sakamoto, Hikaru Yabuta, Masanao Abe, Akiko Miyazaki, Aiko Nakato, Masahiro Nishimura, Tatsuaki Okada, Toru Yada, Kasumi Yogata, Satoru Nakazawa, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Yuichi Tsuda, Sei-ichiro Watanabe, Makoto Yoshikawa, Shogo Tachibana, Hisayoshi Yurimoto
Summary: Initial analyses indicate that asteroid Ryugu has a composition similar to CI carbonaceous chondrites, which are the most primitive meteorites. However, further research is needed to establish the exact relationship. A recently conducted study reveals that Ryugu and CI chondrites share the same zinc and copper isotopic composition, suggesting a common genetic heritage between them. Additionally, the study suggests that Ryugu-like material might have contributed to Earth's budgets of certain elements.
Correction
Astronomy & Astrophysics
Marine Paquet, Frederic Moynier, Tetsuya Yokoyama, Wei Dai, Yan Hu, Yoshinari Abe, Jerome Aleon, Conel M. O'd. Alexander, Sachiko Amari, Yuri Amelin, Ken-ichi Bajo, Martin Bizzarro, Audrey Bouvier, Richard W. Carlson, Marc Chaussidon, Byeon-Gak Choi, Nicolas Dauphas, Andrew M. Davis, Tommaso Di Rocco, Wataru Fujiya, Ryota Fukai, Ikshu Gautam, Makiko K. Haba, Yuki Hibiya, Hiroshi Hidaka, Hisashi Homma, Peter Hoppe, Gary R. Huss, Kiyohiro Ichida, Tsuyoshi Iizuka, Trevor R. Ireland, Akira Ishikawa, Motoo Ito, Shoichi Itoh, Noriyuki Kawasaki, Noriko T. Kita, Kouki Kitajima, Thorsten Kleine, Shintaro Komatani, Alexander N. Krot, Ming-Chang Liu, Yuki Masuda, Kevin D. McKeegan, Mayu Morita, Kazuko Motomura, Izumi Nakai, Kazuhide Nagashima, David Nesvorny, Ann N. Nguyen, Larry Nittler, Morihiko Onose, Andreas Pack, Changkun Park, Laurette Piani, Liping Qin, Sara S. Russell, Naoya Sakamoto, Maria Schoenbaechler, Lauren Tafla, Haolan Tang, Kentaro Terada, Yasuko Terada, Tomohiro Usui, Sohei Wada, Meenakshi Wadhwa, Richard J. Walker, Katsuyuki Yamashita, Qing-Zhu Yin, Shigekazu Yoneda, Edward D. Young, Hiroharu Yui, Ai-Cheng Zhang, Tomoki Nakamura, Hiroshi Naraoka, Takaaki Noguchi, Ryuji Okazaki, Kanako Sakamoto, Hikaru Yabuta, Masanao Abe, Akiko Miyazaki, Aiko Nakato, Masahiro Nishimura, Tatsuaki Okada, Toru Yada, Kasumi Yogata, Satoru Nakazawa, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Yuichi Tsuda, Sei-ichiro Watanabe, Makoto Yoshikawa, Shogo Tachibana, Hisayoshi Yurimoto
Article
Geochemistry & Geophysics
Lingyu Zhang, Kristoffer Szilas
Summary: This study presents new petrological and geochemical data for the Narssaq Ultramafic Body (NUB) in the Itsaq Gneiss Complex of SW Greenland. The results indicate that the ultramafic rocks of NUB are not mantle residues, but instead represent crustal cumulates derived from high-Mg magmas.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
Rong Xu, Sarah Lambart, Oliver Nebel, Ming Li, Zhongjie Bai, Junbo Zhang, Ganglan Zhang, Jianfeng Gao, Hong Zhong, Yongsheng Liu
Summary: This study investigated the iron isotope compositions of Cenozoic basalts in Southeast China, finding significant variations related to different types of basalts and their respective sources.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
C. J. Ebinger, Miriam C. Reiss, Ian Bastow, Mary M. Karanja
Summary: The East African rift system is formed above mantle upwellings and the formation of rifts is related to lithospheric thinning and magmatic activity. The amount of splitting varies spatially and the fast axes are predominantly parallel to the orientation of the rifts. Thick lithospheric modules have less splitting and different orientations, which may indicate mantle plume flow. Splitting rotates and increases in strength as it enters the rift zones, suggesting that the anisotropy is mainly present at shallow depths.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Correction
Geochemistry & Geophysics
Ekaterina Rojas-Kolomiets, Owen Jensen, Michael Bizimis, Gene Yogodzinski, Lukas Ackerman
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
Robert W. Nicklas, Igor S. Puchtel, Ethan F. Baxter
Summary: Oxygen fugacity is a fundamental parameter for understanding redox processes in igneous systems. This study compares the Fe-XANES oxybarometry method with the V-in-olivine method for evaluating fO(2) in MORB lavas. The results show that the V-in-olivine method is not applicable to samples with low MgO content, and that the majority of Archean komatiite sources have lower fO(2) than modern MORB.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
Chunfei Chen, Stephen F. Foley, Sebastian Tappe, Huange Ren, Lanping Feng, Yongsheng Liu
Summary: The volatile components CO2 and H2O play a major role in mantle melting and heterogeneity. In this study, Ca isotopes were used to trace the lithological heterogeneity in alkaline magmatic rocks. The results revealed the presence of K-richterite and carbonate components as the source of alkaline magmas with low delta 44/40Ca values. These findings highlight the importance of Ca isotopes as a robust tracer of lithological variation caused by volatiles in the Earth's upper mantle.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
Timothee Jautzy, Gilles Rixhon, Regis Braucher, Romain Delunel, Pierre G. Valla, Laurent Schmitt, Aster Team
Summary: Although the current approach to estimate catchment-wide denudation rates using only 10Be concentrations has made significant progress in geomorphology, this study argues for the inclusion of 26Al measurements and testing of steady-state assumptions in slow eroding, formerly glaciated landscapes. The study conducted measurements of both 10Be and 26Al in stream sediments from the Vosges Massif in France and found that elevation, slope, channel steepness, and precipitation were the primary factors controlling denudation rates. The study also revealed a significant relationship between the extent of past glaciation and the cosmogenic (un-)steadiness in the stream sediments.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
Erik van der Wiel, Douwe J. J. van Hinsbergen, Cedric Thieulot, Wim Spakman
Summary: Numerical models of Earth's mantle dynamics can predict the vigour and mixing of mantle flow, and the average slab sinking rates are an unexplored parameter that can provide intrinsic information on these characteristics. Through numerical experiments, it has been found that slab sinking rates are strongly correlated with mantle convection and mixing, and may explain geochemical observations from hotspot volcanoes.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
