Review
Geosciences, Multidisciplinary
M. Santosh, D. Groves
Summary: Mineral systems with their core of ore deposits play a crucial role in Earth's thermal and tectonic evolution, controlling the assembly and breakup of supercontinents. Plate tectonics has been operating on Earth since the Eoarchean, and the evolution of Earth's atmosphere-hydrosphere-biosphere system also influences the formation of mineral deposits.
Article
Engineering, Chemical
Hossein Aghajani, Fardin Gheshlaghi Soflaei
Summary: This research introduces the concept of the interaction coefficient in solvent extraction. The main parameters for rhenium extraction were determined to be the organic phase to aqueous phase ratio, TBP concentration, and pH. Experiments were designed using Response Surface Method and Minitab software. The results showed a dependence between pH, O/A phase ratio, and TBP concentration, with rhenium extraction reaching a maximum of 93.8% and molybdenum extraction averaging around 40% under certain conditions.
MINERALS ENGINEERING
(2022)
Article
Geosciences, Multidisciplinary
Hugo Moreira
Summary: The analysis of mineral inclusions in magmas indicates significant changes in the oxidation state of sulfur before and after the Great Oxidation Event. These changes are attributed to the recycling of sediments altered by atmospheric events at the Earth's surface into the mantle.
Article
Multidisciplinary Sciences
Nicholas F. Wogan, David C. Catling, Kevin J. Zahnle, Mark W. Claire
Summary: The Great Oxidation Event (GOE), which marks the appearance of an oxygen-rich atmosphere, is considered one of the most important events since the origin of life. In this study, researchers developed a one-dimensional time-dependent photochemical model to investigate the behavior of the transitional atmosphere during changes in biogenic forcing. The simulations showed that transitions between anoxic and oxic atmospheres could occur within a few hundred to a few thousand years, and the stability of oxygen in the atmosphere was dependent on its concentration.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Geology
Lei Yan, Yu Fan, Jun Huang, Yangyang Li, Taofa Zhou, Tong Zuo, Yifan Zhang, Guangqing Xu
Summary: This study investigated the occurrence state and enrichment mechanism of Re in Re-rich molybdenite from the Merlin deposit. The results showed that Re atoms substitute Mo atoms in situ in the Re-rich area of molybdenite, and lattice defects such as five-fold twinning play an important role in the enrichment of Re. Magmatichydrothermal fluids released from igneous rocks are likely the main source of oreforming materials for the Merlin deposit.
ORE GEOLOGY REVIEWS
(2023)
Article
Geochemistry & Geophysics
Daniel Garduno Ruiz, Colin Goldblatt, Anne-Sofie Ahm
Summary: A one-dimensional atmospheric photochemical model is used to study the effect of temperature and humidity variations on the evolution of O2 and O3 during the Great Oxidation Event (GOE). It is found that changes in temperature and humidity can significantly impact the levels of O2 and O3, with higher temperatures and humidity leading to higher levels of these gases.
EARTH AND PLANETARY SCIENCE LETTERS
(2023)
Article
Chemistry, Physical
Yuan-Sheng Cheng, Zhi-Yuan Xing, Xu Zheng, Xu-Dong Xu, Yan-Shang Kang, Delei Yu, Kong-Lin Wu, Fang-Hui Wu, Guozan Yuan, Xian-Wen Wei
Summary: The development of high-activity photocatalysts for the large-scale industrial application of photocatalytic selective conversion of biomass alcohols into value-added chemicals and H2 evolution in aqueous solution is still a challenge. In this study, ReS2 was used as a high-efficiency co-catalyst to modify flower-like ZnIn2S4 microspheres, resulting in significant enhancements in the photocatalytic oxidation of furfural alcohols combined with H2 evolution. The optimal catalyst, RZIS-3, containing 4.08 wt% ReS2, achieved remarkably high generation rates of H2 and furfural at 3092.9 and 2981.1 mmol g-1 h-1, respectively, nearly 12 times faster than blank ZnIn2S4. Mechanism studies confirmed that the migration of photogenerated carriers from ZnIn2S4 to ReS2 was responsible for the enhanced photoactivity of the composite. Furthermore, the composite showed high performance in the oxidation of other alcohol biomass intermediates, providing valuable insights for the design and fabrication of novel photocatalytic hydrogen evolution systems.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Metallurgy & Metallurgical Engineering
Xiao-bin Li, Tao Wu, Qiu-sheng Zhou, Tian-gui Qi, Zhi-hong Peng, Gui-hua Liu
Summary: The kinetics of oxidation roasting of molybdenum concentrate were studied through experiments, and it was found that high temperature is beneficial for the oxidation process. The oxidation process follows the unreacted shrinking nucleus model, and the oxidation rate is positively correlated with the particle size of the concentrate.
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
(2021)
Article
Chemistry, Physical
Shima Barakan, Valeh Aghazadeh
Summary: This study evaluates the potential of hydrophobic deep eutectic solvents (DESs) as an eco-friendly solvent for extracting rhenium (Re). The selective transfer of Re from aqueous and pressure oxidative leaching solutions was investigated using a mixture of fatty acid and quaternary ammonium salt. The extraction potential of hydrophobic-DES was evaluated through various tests and an optimum condition for Re separation was found. Another aspect of the study focused on the toxicology of hydrophobic-DES, which was found to have low toxicity according to the MTT method.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Multidisciplinary Sciences
Chuan Huang, Zheng-Xiang Li, Nan Zhang
Summary: Geodynamic modeling shows that the yield strength of the oceanic lithosphere determines the assembly path of a supercontinent. The study finds that high oceanic lithospheric strength leads to introversion assembly, whereas lower strength leads to extroversion assembly. The theoretically estimated reduction in oceanic crustal thickness and strength during Earth's secular cooling predicts the assembling of the next supercontinent Amasia through the closure of the Pacific Ocean instead of the Indian-Atlantic oceans.
NATIONAL SCIENCE REVIEW
(2022)
Article
Mineralogy
Elena Belogub, Vladimir V. Shilovskikh, Michail A. Rassomakhin, Olga Yu Plotinskaya, Alexandr N. Savichev, Ksenia A. Filippova, Sergey Kirichenko, John Spratt, Reimar Seltmann
Summary: Scroll-like crystals of molybdenite, enriched in rhenium and represented by the 3R polytype, were discovered in two locations in the Ural region of Russia. These crystals mainly twist around the X-axis and their formation is likely related to nucleation centers formed by mica crystals.
MINERALOGICAL MAGAZINE
(2022)
Article
Geochemistry & Geophysics
Valentine A. Chanturiya, Tamara N. Matveeva, Viktoriya V. Getman, Anna Yu. Karkeshkina, Nadezhda K. Gromova
Summary: Modern trends in technological improvement for producing high-quality rhenium-containing molybdenum concentrates focus on developing environmentally friendly solutions, reducing or replacing toxic substances, and using plant reagents and microorganisms to eliminate energy-intensive processes. New compositions of flotation reagents are used to selectively change the hydrophobic properties of target minerals, achieving high rates of valuable metal recovery into bulk concentrate.
Article
Geosciences, Multidisciplinary
Genming Luo, Xiangkun Zhu, Shuijiong Wang, Shihong Zhang, Chaoqun Jiao
Summary: This paper briefly introduces the conception and research history of the Great Oxidation Event (GOE) in the early Paleoproterozoic and summarizes the primary geological and geochemical records of this event. It provides an overview of the significant progress in three fields of the GOE: the timing and process of its startup, its mechanisms, and its climatic-ecological effects. The paper also proposes four aspects for future explorations.
SCIENCE CHINA-EARTH SCIENCES
(2022)
Article
Geology
Mathis Warlo, Glenn Bark, Christina Wanhainen, Iris McElroy, Alexander Bjorling, Ulf Johansson
Summary: In order to maximize profit and sustainability in mining operations, understanding the chemistry, mineralogy, texture, and structure of ores is essential. Synchrotron radiation X-ray fluorescence mapping provides high-resolution analysis potential for trace elements, but challenges in data acquisition and processing require careful human examination for complex geological samples.
ORE GEOLOGY REVIEWS
(2022)
Article
Geochemistry & Geophysics
Frantz Ossa Ossa, Jorge E. Spangenberg, Andrey Bekker, Stephan Koenig, Eva E. Stueken, Axel Hofmann, Simon W. Poulton, Aierken Yierpan, Maria Varas-Reus, Benjamin Eickmann, Morten B. Andersen, Ronny Schoenberg
Summary: This study investigates the marine shales deposited during the Lomagundi Event in the Paleoproterozoic era, providing evidence for a highly productive and well-oxygenated photic zone. However, a subsequent deoxygenation of the atmosphere-ocean system led to enhanced denitrification and reduction of selenium oxyanions. The findings suggest that oxygen levels in the atmosphere-ocean system during this period were much lower than modern concentrations.
EARTH AND PLANETARY SCIENCE LETTERS
(2022)
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)
