Article
Metallurgy & Metallurgical Engineering
Sabrina Hedrich, Anja Breuker, Mirko Martin, Axel Schippers
Summary: Sands from the German Baltic Sea coast are recovered as construction material and contain heavy minerals enriched with zircon, garnet, ilmenite, rutile, magnetite, and monazite. Gravity and magnetic separation can be used to concentrate the heavy minerals. Bioleaching experiments were conducted on zircon concentrates and eudialyte concentrates containing rare earth elements (REE), but the results showed limitations in the extraction of REEs from heavy minerals through bioleaching.
Article
Geology
Lorraine Tual, Matthijs A. Smit, Ellen Kooijman, Melanie Kielman-Schmitt, Lothar Ratschbacher
Summary: This article investigates the REE systematics in high-grade rocks and explores the chemical equilibrium between garnet and accessory minerals under different conditions. The study finds that co-genetic garnet and accessory minerals can achieve REE equilibrium during growth, but the age and compositional record of co-genetic accessory minerals are distinctly different between different cases. The findings provide an improved framework for the reliable identification of accessory minerals that equilibrated with garnet.
JOURNAL OF METAMORPHIC GEOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Lanlan Shi, Yuji Sano, Naoto Takahata, Mizuho Koike, Takuya Morita, Yuta Koyama, Takanori Kagoshima, Yuan Li, Sheng Xu, Congqiang Liu
Summary: In this study, a method was developed to analyze rare earth elements in silicate glasses and zircon minerals using NanoSIMS. The results obtained through experiments and calibration provide information about the content and partition coefficients of these elements. The findings suggest a positive relationship between the secondary ion yields of rare earth elements and their ionization potentials.
FRONTIERS IN CHEMISTRY
(2022)
Article
Green & Sustainable Science & Technology
Iga Trisnawati, Akbar Yulandra, Gyan Prameswara, Wahyu Rachmi Pusparini, Panut Mulyono, Agus Prasetya, Himawan Tri Bayu Murti Petrus
Summary: The study explored the effects of temperature, pH, and stirring speed on multistage precipitation processes for rare earth elements. It was found that Na2CO3 was effective in precipitating LREEs at higher temperatures, while NH4OH was better at precipitating HREEs under the same processing conditions. Adjusting these factors can control the precipitation efficiency of rare earth elements in the purification process.
JOURNAL OF SUSTAINABLE METALLURGY
(2021)
Article
Geosciences, Multidisciplinary
Fumiko Higashino, Tetsuo Kawakami, Shuhei Sakata, Takafumi Hirata
Summary: In this study, multiple periods of garnet-forming metamorphism in the Ser Rondane Mountains (SRM), East Antarctica were determined using in situ U-Pb dating of zircon and petrochronological approach utilizing distribution coefficient of rare earth elements (DREE) between zircon and garnet and REE patterns of zircon. This is the first report of multiple timings of garnet formation detected within single samples from the SRM. The results suggest that the SRM may be affected by a single long-lived regional metamorphism or polymetamorphism.
Article
Energy & Fuels
Juanjuan Ma, Shuyan Li, Jinxi Wang, Shuting Jiang, Balaji Panchal, Yuzhuang Sun
Summary: This study optimized the culture conditions and bioleaching process of Aspergillus niger for the extraction of rare earth elements (REEs) from coal fly ash (CFA). It was found that organic nitrogen sources influenced the morphology and acid production capacity of A. niger, with oxalic acid being the main acid secreted (4.05 mg/L). The initial pH value was identified as the most influential factor affecting the bioleaching process, and by optimizing it, a leaching rate of 30.91% for total REEs in CFA was achieved. The main mechanism of REEs bioleaching by A. niger from CFA was speculated to be proton exchange and organic ligand complexation.
Article
Biotechnology & Applied Microbiology
Michael Paper, Max Koch, Patrick Jung, Michael Lakatos, Tom Nilges, Thomas B. Brueck
Summary: This study investigated the potential of 12 cyanobacterial strains for biosorption of rare earth elements, and Nostoc sp. 20.02 showed the highest adsorption capacity. Synechococcus elongatus UTEX 2973, Calothrix brevissima SAG 34.79, Desmonostoc muscorum 90.03, and Komarekiella sp. 89.12 were also promising strains. The adsorption of metals by the strains had fast kinetics and pH value had a significant impact on the process.
FRONTIERS IN BIOENGINEERING AND BIOTECHNOLOGY
(2023)
Article
Geochemistry & Geophysics
Mengdie Chen, Shujuan Jiao, Yi Zou, Lei Zhao, Bo Liu, Qiuli Li, Mingguo Zhai
Summary: Recent studies have revealed that the supracrustal rocks in North Korea have undergone a similar Paleoproterozoic high-grade metamorphism as those in the Jiao-Liao-Ji mobile belt in the North China Craton, related to the Columbia Supercontinent. Additionally, there has been overprinting of a thermal event with mineral assemblages of amphibolite-facies due to extensive Late Jurassic-Cretaceous granitoids intrusion in the region.
Article
Geochemistry & Geophysics
Rafaela Machado Gengo, Renato Moraes, Laisa de Assis Batista, Caio Arthur Santos, Gergely Andres Julio Szabo
Summary: Using metamorphic modeling, geothermobarometry, and U-Pb dating, this study analyzed the P-T-t evolution of Colonia metapelite in the Campo do Meio Shear Belt and found similarities with the Neoproterozoic units in the Southernmost Brasilia Orogen. However, the degree of zircon dissolution hampers accurate evaluation of stratigraphic correlations proposed in the literature.
Article
Chemistry, Analytical
I. Silachyov
Summary: For the first time, the rare earth elements (REE) content of two samples of zircon concentrate from local manufacturers was investigated using instrumental neutron activation analysis (INAA) and energy dispersive X-ray fluorescence analysis. A comparator variant of INAA was used, which divided the elements into three groups based on detector type, radionuclide half-lives, and suitable comparator.
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
(2023)
Review
Engineering, Environmental
Emmanuel Yaw Owusu-Fordjour, Xinbo Yang
Summary: Bioleaching, using microorganisms to dissolve minerals and extract Rare Earth Elements (REEs) in aqueous media, has gained attention for its potential eco-friendliness compared to other extraction methods. Mixed culture bioleaching is preferred for efficient REEs extraction, promoting closed-loop recycling and reducing supply chain issues. This literature review provides an overview of challenges, opportunities, microorganisms, mechanisms, approaches, parameters, and techno-economic considerations related to REEs bioleaching, and offers recommendations for future advancements.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Geology
Matthew Rioux, Joshua M. Garber, Michael Searle, James L. Crowley, Sally Stevens, Mark Schmitz, Andrew Kylander-Clark, Kayla Leal, Tyler Ambrose, Andrew J. Smye
Summary: High-precision dating of the metamorphic sole of ophiolites reveals insight into the tectonic evolution of ophiolites and subduction zone processes. The study on the metamorphic sole of the Samail ophiolite provides detailed information on the timing and temperature evolution of the metamorphic process.
JOURNAL OF METAMORPHIC GEOLOGY
(2023)
Article
Geochemistry & Geophysics
Huixia Ding, Matthew J. Kohn, Zeming Zhang
Summary: Partial melting in the middle crust has a profound impact on rheology and deformation behavior. In the Greater Himalayan Sequence, anatectic events lasted about 22-24 million years, which differs from predictions made by numerical models of viscous flow.
EARTH AND PLANETARY SCIENCE LETTERS
(2021)
Article
Geochemistry & Geophysics
Pablo Farias, Roberto F. Weinberg, Alfonso Sola, Melanie Finch
Summary: U-Pb dating of zircon, monazite, and titanite combined with trace element composition is used to characterize the thermal evolution of the migmatitic Agua del Sapo complex. The complex experienced two consecutive early Paleozoic orogenies, associated with subduction and melting at upper-amphibolite facies. The accessory phases of detrital zircon, monazite, and titanite record different growth and dissolution-precipitation events during these orogenies. The prolonged high heat flow until 380 Ma blurs the boundary between the Famatinian and the subsequent Achalian/Chanic orogenies.
Review
Green & Sustainable Science & Technology
Olena Artiushenko, Raphael Freire da Silva, Volodymyr Zaitsev
Summary: Rare Earth elements (REEs) are crucial for high-tech and everyday consumer products. The demand for REEs has rapidly grown due to their use in high-tech and sustainable technologies. However, the REEs world market is at risk due to political tensions and low substitutability of REEs mining technology. This review focuses on the adsorptive recovery of REEs from solutions with high content of transition and heavy metals.
SUSTAINABLE MATERIALS AND TECHNOLOGIES
(2023)
Article
Geochemistry & Geophysics
Bruno V. Ribeiro, Christopher L. Kirkland, David E. Kelsey, Steven M. Reddy, Michael I. H. Hartnady, Frederico M. Faleiros, Kai Rankenburg, Janne Liebmann, Fawna J. Korhonen, Chris Clark
Summary: Certain isotopic ratios in minerals like monazite, apatite, and mica can serve as indicators of thermal response, but existing systems may not accurately track the timing of low-to medium-temperature fabric realignment. This study introduces a new analytical method that allows for spatially resolved measurement of isotopic ratios in distinct microstructures, enabling the characterization of the time-strain evolution of mid-crustal shear zones. The results highlight the importance of establishing direct time-strain relationships to accurately reconstruct deformation histories.
EARTH AND PLANETARY SCIENCE LETTERS
(2023)
Article
Geosciences, Multidisciplinary
Aral I. Okay, Andrew R. C. Kylander-Clark
Summary: Detrital zircon ages from Upper Cretaceous sandstones in the Pontides and Anatolide-Tauride Block reveal differences in zircon compositions between the two regions. The absence of sediment transport between the two blocks during the latest Cretaceous suggests an earlier deformation event in the Bornova Flysch Zone related to ophiolite obduction. The predominance of Carboniferous detrital zircons highlights the significance of Carboniferous magmatic activity in the Anatolide-Tauride Block.
INTERNATIONAL JOURNAL OF EARTH SCIENCES
(2023)
Article
Geology
David Hernandez-Uribe, Chris G. Mattinson, Megan E. Regel, Jianxin Zhang, Katie A. Stubbs, Andrew R. C. Kylander-Clark
Summary: New zircon U-Pb ages and trace-element data from eclogite and host paragneiss in the Dulan area, China, show that this terrane experienced about 42 million years of eclogite-facies metamorphism, similar to other large UHP terranes. The metamorphic ages of paragneiss are generally younger than that of eclogite, suggesting the later stages of continental collision. The study reconciles the observations with model predictions by highlighting the role of differential solubility in zircon growth or recrystallization along the pressure-temperature (P-T) path.
JOURNAL OF METAMORPHIC GEOLOGY
(2023)
Article
Geochemistry & Geophysics
Amy C. Moser, Alexander D. Lusk, Snir Attia, Joshua M. Garber, Gareth G. E. Seward, Andrew R. C. Kylander-Clark
Summary: Quantifying the timing and conditions of ductile deformation is crucial for quantitative models of lithospheric deformation. However, it is challenging to directly constrain these variables and observe their changes during a single deformation event.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2023)
Article
Geology
Matthew Rioux, Joshua M. Garber, Michael Searle, James L. Crowley, Sally Stevens, Mark Schmitz, Andrew Kylander-Clark, Kayla Leal, Tyler Ambrose, Andrew J. Smye
Summary: High-precision dating of the metamorphic sole of ophiolites reveals insight into the tectonic evolution of ophiolites and subduction zone processes. The study on the metamorphic sole of the Samail ophiolite provides detailed information on the timing and temperature evolution of the metamorphic process.
JOURNAL OF METAMORPHIC GEOLOGY
(2023)
Article
Geosciences, Multidisciplinary
Stefano Tavani, Kei Ogata, Francesco Vinci, Monia Sabbatino, Andrew Kylander-Clark, Giovanni Caterino, Alessandro Buglione, Alessio Cibelli, Augusto Maresca, David Iacopini, Mariano Parente, Alessandro Iannace
Summary: During the Early Cretaceous, Adria experienced an acceleration in subsidence after the Africa-Europe convergence, which has been puzzling due to the lack of faults associated with crustal stretching in the central Mediterranean area. However, a syn-sedimentary extensional fault system in southern Italy has been discovered, indicating the largest exposed extensional system of Adria during the Aptian-Cenomanian period. The extensional tectonics in Adria can be explained by a slab pull mechanism caused by the subducting Neotethys Ocean.
JOURNAL OF STRUCTURAL GEOLOGY
(2023)
Article
Geochemistry & Geophysics
Alexander T. De Vries Van Leeuwen, Tom Raimondo, Laura J. Morrissey, Martin Hand, Derrick Hasterok, Chris Clark, Robert Anczkiewicz
Summary: Multi-mineral petrochronology tracks changes in the thermochemical environment experienced by rocks during metamorphism. The study of garnet-chlorite schists from the Walter-Outalpa Shear Zone in South Australia reveals a prolonged record of high thermal gradient metamorphism. The findings suggest that the radiogenic heat production in the basement rocks may have played a significant role in driving the observed metamorphism.
Article
Geochemistry & Geophysics
S. Tavani, L. Smeraglia, S. Fabbi, L. Aldega, M. Sabbatino, G. L. Cardello, A. Maresca, G. Schirripa Spagnolo, A. Kylander-Clark, A. Billi, S. M. Bernasconi, E. Carminati
Summary: We investigate the timing and mode of the Circeo thrust formation and its subsequent extensional reactivation in the central Apennines using a combination of structural analysis, isotopic analysis, seismic interpretation, and other methods. Our results show that the forelandward migration of the foredeep-thrust system occurred at variable velocities, which were synchronous with the opening of back-arc basins and quiescent periods.
Article
Geochemistry & Geophysics
Marine Jouvent, Vit Peresty, Petr Jerabek, Ondrej Lexa, Andrew R. C. Kylander-Clark
Summary: The geochronology of metasediments in orogenic wedges reveals important information about the early evolution of collisional systems. This study focuses on the Variscan processes in the Saxothuringian orogenic wedge, showing the transition from oceanic to continental subduction and collision. By analyzing phyllites and micaschists in the Erzgebirge Crystalline Complex using in situ monazite U-Pb geochronology and Rare Earth Elements (REE) geochemistry, the researchers were able to link the ages and geochemical patterns to specific tectonometamorphic events. The results indicate a phase of accretion and inverted metamorphic field gradient followed by exhumation and final exhumation of the wedge.
Review
Environmental Sciences
Shujuan Jiao, Michael Brown, Ross N. Mitchell, Priyadarshi Chowdhury, Chris Clark, Lin Chen, Yi Chen, Fawna Korhonen, Guangyu Huang, Jinghui Guo
Summary: Ultrahigh-temperature (UHT) metamorphism occurs in the continental crust at depths of 15-55 km and requires unusually high thermal conditions. This review explores the tectonic settings of UHT metamorphism, which are commonly associated with convergent plate margins, supercontinent assembly, arc-backarc systems, thinned lithosphere, orogenic plateaus, and orogenic collapse. Geophysical mapping reveals the occurrence of UHT metamorphism in present-day orogens such as the Tibetan Plateau and the North American Cordillera. Further research should focus on improved geodynamic modelling to establish quantitative correlations between heat sources and the spatial extent of UHT metamorphism.
NATURE REVIEWS EARTH & ENVIRONMENT
(2023)
Article
Geochemistry & Geophysics
Stefania Corvo, Matteo Maino, Sandra Piazolo, Andrew R. C. Kylander-Clark, Andrea Orlando, Silvio Seno, Antonio Langone
Summary: In this study, the reliability of titanite U-Pb dating in determining the age of deformation in mylonitic rocks is explored through the relationships between titanite-hosting microdomains, intragrain chemical variations, microstructure, and fluids. The research is conducted in a post-Variscan shear zone in the mid-low continental crust of the Ivrea-Verbano Zone in the Southern Alps, Italy. The results indicate that microstructurally and chemically calibrated U-Pb dating of titanite can provide realistic ages of shear zone activity when crystal-plastic processes and local interaction of titanite with small amounts of fluids along grain boundaries predominate.
EARTH AND PLANETARY SCIENCE LETTERS
(2023)
Article
Geosciences, Multidisciplinary
Laura J. Morrissey, Justin L. Payne, Martin Hand, Chris Clark, Matthew Janicki
Summary: This study presents new LA-ICP-MS U-Pb monazite and detrital zircon geochronology, revealing the age and metamorphic processes of the Archean to Paleoproterozoic basement in the Mount Woods Domain, Australia.
PRECAMBRIAN RESEARCH
(2023)
Article
Geosciences, Multidisciplinary
Chris Clark, David E. Kelsey, Fariba Kohanpour, Christopher L. Kirkland, Kai Rankenburg, Sean Makin
Summary: Over ten thousand detrital zircon U-Pb analyses were conducted on Neoproterozoic rocks from the Yeneena and northwest Officer Basins in Western Australia. The results showed that the detrital zircon spectra did not vary significantly between the fast pulse laser ablation and conventional laser ablation techniques. The analyses indicated that the sediment in the basins was mainly sourced from Mesoproterozoic terranes, with the major age peaks coinciding with magmatic rock ages in Australia. Other grains could be sourced from Dronning Maud Land and the Kalahari Craton.
PRECAMBRIAN RESEARCH
(2023)
Article
Geochemistry & Geophysics
Luca Smeraglia, Stefano Bernasconi, Canio Manniello, Dimitris Spanos, Aristotelis Pagoulatos, Luca Aldega, Andrew Kylander-Clark, Madalina Jaggi, Fabrizio Agosta
Summary: We used a combination of field mapping, structural and microstructural analyses, stable-clumped isotope geochemistry, and U-Pb dating to investigate fault-related fluid flow in the External Hellenides fold-and-thrust belt. Our findings suggest that the nature of fluid circulation changed over different stages of tectonic evolution, with cold meteoric water-derived fluids dominating during forebulge uplift, warm fluids buffered by the carbonate host rock during foreland flexuring and early layer-parallel shortening, and increasing dominance of cold meteoric water during thrust wedge accretion and post-orogenic extension. This study has important implications for understanding fluid migration and potential hydrocarbon reservoirs in the Hellenides-Albanides fold-and-thrust belt in the Mediterranean area.
Article
Geochemistry & Geophysics
Aral I. Okay, Ercan Ozcan, Muzaffer Siyako, Kerem A. Burkan, Andrew R. C. Kylander-Clark, Michael D. Bidgood, David Shaw, Michael D. Simmons
Summary: The Thrace Basin, with its complex tectonic history, is a challenging case for classification. New geochronological and biostratigraphic data provide insights into its tectonic evolution, revealing that the basin primarily contains early Oligocene siliciclastic turbidites sourced from the Rhodope Complex. The exhumation of the northern Rhodope Complex coincided with the main subsidence in the Thrace Basin, suggesting a connection between crustal rotation and basin development.