Article
Chemistry, Multidisciplinary
Meijun Yang, Xiaoliang Liang, Ying Li, Hongping He, Runliang Zhu, Yuji Arai
Summary: The study found that heavy REEs tended to partition more in aged ferrihydrite during the transformation process, and the presence of REEs slowed down the transformation of ferrihydrite to goethite at pH 5. The structural substitution of heavy REEs such as Yb and Lu was identified as a critical factor in suppressing ferrihydrite transformation.
ACS EARTH AND SPACE CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Mark Baranov, Yan Duan, Nitai Leffler, Shani Avineri, Vladimir Ezersky, Ira A. Weinstock
Summary: In this study, entirely inorganic polyoxometalate cluster-anion ligands are used to trap and impart heat resistance to metastable metal-oxide based NCs. This is demonstrated by trapping 6-line ferrihydrite NCs, which are intermediates in the spontaneous conversion of beta-FeOOH to hematite (alpha-Fe2O3). The results suggest that polyoxometalate ligation may be a general method for stabilizing metastable phases as the cores of entirely inorganic macro-anion like complexes.
CHEMICAL COMMUNICATIONS
(2023)
Article
Soil Science
Jing Liu, Runliang Zhu, Lingya Ma, Haoyang Fu, Xiaoju Lin, Stephen C. Parker, Marco Molinari
Summary: This study demonstrates that ferrihydrite has the strongest adsorption capacity for phosphate and cadmium among the three iron (oxyhydr)oxides studied, with synergistic adsorption of phosphate and cadmium observed. The research reveals the adsorption behaviors and mechanisms of different minerals, providing insights for developing surface complexation models.
Article
Chemistry, Physical
Walber Goncalves Guimaraes Jr, Guilherme Ferreira de Lima, Helio Anderson Duarte
Summary: A chemical model for the isomorphic substitution of Al in poorly crystalline oxyhydroxide Ferrihydrite (Fh) has been proposed. Using DFT/plane wave calculations, it was found that Al prefers to replace the octahedral Fe sites. The substitution of Al affects the quadrupolar coupling constant of Al-27 NMR and Mo''ssbauer quadrupole splitting and isomer shift parameters, which are influenced by the concentration of substituted sites. Additionally, Al substitution increases the band gap dispersion and the formation of Al electronic states in the conduction band. The standard Helmholtz free energy of Al substitution has also been estimated and discussed in detail.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Physical
Walber Goncalves Guimaraes Jr, Guilherme Ferreira de Lima, Helio Anderson Duarte
Summary: Ferrihydrite (Fh) is an important oxy-hydroxide that plays significant roles in geochemistry, ion mobility, adsorption, and the formation of more crystalline phases. This study proposes a chemical model for the substitution of Fe sites by Al in Fh. DFT/plane wave calculations reveal the local environment and investigate the structural and electronic properties of Al-substituted Fh. The results show that Al prefers to replace the octahedral Fe sites and affect various parameters such as NMR and Moessbauer parameters.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Engineering, Environmental
G. Scullett-Dean, J. L. Hamilton, O. Repina, H. E. A. Brand, E. D. Burton, M. Saunders, T. C. Santini
Summary: This study investigated the incorporation of various minor and trace elements into hematite and their effects on the physical and chemical properties of the mineral. It was found that the simultaneous incorporation of Al, Cr, V, and Zn showed both synergistic and antagonistic effects among certain element combinations. However, Mo had minimal association with hematite, while As completely prevented its formation. The results provide new insights into trace element geochemistry in hematite and emphasize the importance of multi-element studies in understanding natural and anthropogenic systems.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Wei Cheng, Remi Marsac, Khalil Hanna, Jean-Francois Boily
Summary: This study investigated the competitive adsorption of dissolved silicate and organic contaminants on goethite surfaces, revealing that high silicate concentrations can displace pre-bound organic molecules. The competition process involves interactions between species and their impact on the goethite surface properties.
Article
Environmental Sciences
Jianwei Lin, Weijie Xiang, Yanhui Zhan
Summary: The characteristics and mechanism of phosphate adsorption onto magnetite, hematite, and goethite were comparatively studied, and it was found that magnetite has a higher adsorption capacity. Additionally, the amendment and capping materials of magnetite, hematite, and goethite can effectively suppress the release of endogenous phosphorus from sediment into the overlying water.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Environmental Sciences
Jianwei Lin, Weijie Xiang, Yanhui Zhan
Summary: The characteristics and mechanism of phosphate adsorption onto magnetite, hematite and goethite were studied, and the effects of magnetite, hematite and goethite amendment and capping on endogenous phosphorus (P) liberation from sediment into overlying water (OW) were investigated. The adsorption of phosphate onto magnetite, hematite and goethite followed the inner-sphere complexation mechanism, and the phosphate adsorption capacity decreased in the order of magnetite>goethite>hematite. The magnetite, hematite and goethite amendment can all decrease the risk of endogenous P release into OW, with magnetite being the most effective.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Geology
Emma R. Locatelli, Derek E. G. Briggs, Andrew Leslie, Jerome Munzinger, Philippe Grandcolas, Porter P. Lowry, David J. Cantrill, Pierre Maurizot, Dominique Cluzel, Nicolas Folcher, Romain Garrouste, Andre Nel
Summary: A Neogene hematite-goethite concretionary 'ironstone' horizon in the Massif du Sud of New Caledonia contains abundant fossil dicotyledonous angiosperm leaves. The leaves are preserved mainly in goethite, replicating the morphology and anatomy of the leaf tissues, and are preserved in multiple ways.
Article
Geochemistry & Geophysics
Si Athena Chen, Peter J. Heaney, Jeffrey E. Post, Peter J. Eng, Joanne E. Stubbs
Summary: Iron (oxyhydr)oxides, such as goethite and hematite, are important indicators of pH, Eh, temperature, microbial activity, and climate conditions in the Critical Zone. This study examined the transformation of two-line ferrihydrite to goethite and hematite under various temperature and pH conditions. The results showed that both goethite and hematite nucleated simultaneously from ferrihydrite and their relative abundances changed with temperature, pH, and water activity. These findings have implications for using hematite-goethite ratios as paleoclimate proxies in low pH buffering systems.
Article
Chemistry, Physical
Marcel G. Goren, Ralph M. Bolanz, Stephen Parry, Jorg Goettlicher, Ralph Steininger, Juraj Majzlan
Summary: This study investigated the structural incorporation of molybdenum in hematite, goethite, and six-line ferrihydrite using a combination of X-ray absorption spectroscopy, powder X-ray diffraction, and inductively-coupled plasma optical emission spectrometry. The results showed that molybdenum could be structurally incorporated in these minerals, forming coordination environments similar to iron. X-ray absorption and diffraction analyses revealed differences in the structural incorporation of molybdenum in different iron oxide minerals.
CLAYS AND CLAY MINERALS
(2021)
Article
Environmental Sciences
Younggun Yoon, Bongkyu Kim, Min Cho
Summary: This study investigated the biogenic mineral transformation of poorly crystalline ferrihydrite in the presence of an acclimated microbial consortium in a soil environment. The microbial consortia were able to transform the ferrihydrite into crystallized hematite and goethite, and the resulting nanostructures were iron nanospheres and nanostars. Fe(II) ion production was higher in the anode electrode sample, and the microbial isolates were more abundant and diverse at the anode.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Metallurgy & Metallurgical Engineering
John Demol, Elizabeth Ho, Karin Soldenhoff, Inna Karatchevtseva, Gamini Senanayake
Summary: The addition of iron minerals to the monazite acid bake process significantly increased the leaching of rare earth elements and thorium, especially at temperatures above 300 degrees C. The presence of iron minerals led to the formation of an amorphous and insoluble iron sulfate-polyphosphate type phase, which enhanced the dissolution of rare earth elements and thorium compared to monazite alone.
Article
Geochemistry & Geophysics
Fangyuan Meng, Hongling Bu, Yingheng Fei, Manjia Chen, Qinkai Lei, Dong Liu, Jian Hua, Fei Wu, Chengshuai Liu
Summary: This study investigates the transformation of ferrihydrite in the presence of Fe2+ and clay minerals. The results show that the presence of clay minerals affects the transformation products of ferrihydrite, including particle dispersion, organic matter content, and transformation pathways. Organic matter increases the dispersion of ferrihydrite and reduces the adsorption capacity of Fe2+.
APPLIED GEOCHEMISTRY
(2022)
Article
Geosciences, Multidisciplinary
X. D. Jiang, X. Zhao, X. Y. Zhao, Y. -M. Chou, A. P. Roberts, J. R. Hein, J. M. Yu, X. M. Sun, X. F. Shi, W. Cao, Q. S. Liu
Summary: This study investigates the impact of central Asian aridification on the low latitude North Pacific Ocean based on the analysis of an abyssal manganese nodule. The results reveal two prominent aridification events at approximately 8-7 million years ago and 3.6-0 million years ago, which affected primary productivity and abyssal microbial activity in the Northwestern Pacific Ocean. The late Miocene event is suggested to be associated with the uplift of the Northeast Tibetan Plateau rather than global cooling.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Review
Geochemistry & Geophysics
Zhaoxia Jiang, Qingsong Liu, Andrew P. Roberts, Mark J. Dekkers, Vidal Barron, Jose Torrent, Sanzhong Li
Summary: Hematite is a common canted antiferromagnetic mineral with a reddish color. Its identification and quantification can be conveniently achieved through magnetic and color properties. Understanding hematite's characteristics and content is crucial for studies of the iron cycle, paleoenvironmental evolution, and research on Mars. However, previous research mainly focuses on stoichiometric hematite, neglecting the effects of cation substitution. Remagnetization is another complex problem associated with hematite. Recognizing the properties of cation-substituted hematite and understanding remagnetization mechanisms are important for identifying and interpreting the magnetic signals carried by hematite.
REVIEWS OF GEOPHYSICS
(2022)
Review
Biotechnology & Applied Microbiology
Pranami Goswami, Kuang He, Jinhua Li, Yongxin Pan, Andrew P. Roberts, Wei Lin
Summary: Magnetotactic bacteria play an important role in aquatic ecosystems, as they can orient themselves using the Earth's magnetic field and navigate to their preferred microenvironments. They are also capable of sequestering heavy metals and their fossilized magnetic nanoparticles can provide insights into past environmental changes and geomagnetic field history.
NPJ BIOFILMS AND MICROBIOMES
(2022)
Article
Multidisciplinary Sciences
Peiyu Liu, Yue Zheng, Rongrong Zhang, Jinling Bai, Kelei Zhu, Karim Benzerara, Nicolas Menguy, Xiang Zhao, Andrew P. Roberts, Yongxin Pan, Jinhua Li
Summary: A general model for gene networks controlling magnetosome biogenesis and chain assembly in magnetotactic bacteria is proposed through comparative genomic and phenomic analysis. Magnetotactic bacteria (MTB) are a group of phylogenetically and morphologically diverse prokaryotes that can sense Earth's magnetic field via nanocrystals of magnetic iron minerals. The study of magnetosome biogenesis and organization in MTB has been limited to a few cultured strains, but this research presents an integrative genomic and phenomic analysis to investigate the genetic basis of magnetosome biomineralization in both cultured and uncultured strains from diverse MTB groups. The magnetosome gene contents/networks are correlated with magnetic particle morphology and chain configuration, and a general model for gene networks controlling magnetosome biogenesis and chain assembly in MTB systems is proposed.
NATIONAL SCIENCE REVIEW
(2023)
Article
Geochemistry & Geophysics
Victor A. Piedrahita, Xiang Zhao, Andrew P. Roberts, Eelco J. Rohling, David Heslop, Simone Galeotti, Laura Rodriguez-Sanz, Fabio Florindo, Katharine M. Grant
Summary: Carbon releases into the climate system result in global warming and ocean acidification, which can be reversed by carbon sequestration. However, the controls on carbon removal timescales and their dependence on initial perturbation amplitude are poorly understood. This study assesses late Paleocene-early Eocene (LPEE) carbon cycle perturbations to constrain carbon removal timescales and reveals accelerated carbon sequestration during LPEE carbon injection recovery. The short carbon removal timescales are likely related to accelerated oceanic biological pump and enhanced chemical weathering.
EARTH AND PLANETARY SCIENCE LETTERS
(2023)
Article
Geosciences, Multidisciplinary
Liao Chang, Zhaowen Pei, Pengfei Xue, Shishun Wang, Zhaoping Wang, Wout Krijgsman, Mark J. J. Dekkers
Summary: This study investigates the origin of multipolarity in Miocene greigite-bearing sediments using electron microscopic and magnetic analyses. It is found that there is a magnetic softening and partial transformation of iron sulfides to magnetite and pyrrhotite in the sediments, leading to the change from single polarity to multipolarity. A new greigite self-reversal model is proposed to explain the commonly observed antiparallel polarities, which has significant implications in geochronology, tectonics, and paleoenvironment.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Geochemistry & Geophysics
Wentao Huang, Shanshan Niu, Mark J. Dekkers, Peter C. Lippert, Dario Bilardello, Peat Solheid, Bo Zhang, Guillaume Dupont-Nivet, Douwe J. J. van Hinsbergen, Lin Ding
Summary: Paleomagnetic investigations of Paleocene lavas from Dianzhong Formation in Linzhou basin of southern Lhasa terrane are essential for determining the timing and paleolatitude of the initial India-Asia collision. However, controversy exists regarding the preservation of primary remanent magnetization in these rocks. This study finds that hydrothermal alteration has significantly impacted the original magnetic carrier, resulting in the contamination or replacement of the primary remanence by thermoviscous and chemical remanent magnetizations.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Environmental Sciences
Dunfan Wang, Andrew P. Roberts, Eelco J. Rohling, Weiqi Yao, Yi Zhong, Zhengquan Yao, Yang Lu, Qingsong Liu
Summary: Stimulation of the biological pump by iron-bearing dust in the eastern equatorial Pacific Ocean plays an important role in long-term carbon sequestration, but the impact of past dust fertilization on CO2 perturbations over major climate transitions is still debated.
COMMUNICATIONS EARTH & ENVIRONMENT
(2023)
Article
Environmental Sciences
Hong Ao, Eelco J. Rohling, Xinzhou Li, Yougui Song, Andrew P. Roberts, Yongming Han, Christopher J. Poulsen, Tara N. Jonell, Diederik Liebrand, Qiang Sun, Xinxia Li, Xiaoke Qiang, Peng Zhang, Mark J. Dekkers
Summary: Grain size and magnetic susceptibility records from the Chinese Loess Plateau and model simulations suggest that the dry and windy Asian glacials during the mid-Pleistocene transition were likely caused by the expansion of the Northern Hemisphere ice sheet. The extreme glacial loess coarsening events at the onset and middle of the mid-Pleistocene transition reflect intensified Asian aridification and winter monsoon activity, coinciding with Northern Hemisphere glacial ice sheet expansion. These findings indicate that the dry and windy Asian glacials were driven by an amplified terrestrial climate response to the coincident Northern Hemisphere ice sheet expansion.
COMMUNICATIONS EARTH & ENVIRONMENT
(2023)
Article
Environmental Sciences
Zhiyong Lin, Harald Strauss, Joern Peckmann, Andrew P. Roberts, Yang Lu, Xiaoming Sun, Tingting Chen, Mathias Harzhauser
Summary: Sulphate deficiency in lake environments leads to increased atmospheric methane, while sulphate-driven anaerobic oxidation of methane (SD-AOM) is hindered. The study identifies abundant iron sulphide minerals in Lake Pannon sediments, indicating substantial methane consumption in the lake. These findings highlight the importance of sulphate in reducing methane release from lake sediments to the atmosphere.
COMMUNICATIONS EARTH & ENVIRONMENT
(2023)
Article
Geochemistry & Geophysics
Mark J. Dekkers, Wout Hanckmann, Simo Spassov, Thilo Behrends
Summary: Siderite is an important sink for iron in the geochemical cycling of iron, but its detection is challenging due to its fine-grained nature and low concentrations. This study explores the potential of low-temperature magnetometry for analyzing siderite. The results show that the presence of siderite can be best diagnosed by evaluating a combination of heating curves and the remanence ratio.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2023)
Article
Multidisciplinary Sciences
Liao Chang, Babette A. A. Hoogakker, David Heslop, Xiang Zhao, Andrew P. P. Roberts, Patrick De Deckker, Pengfei Xue, Zhaowen Pei, Fan Zeng, Rong Huang, Baoqi Huang, Shishun Wang, Thomas A. A. Berndt, Melanie Leng, Jan-Berend W. Stuut, Richard J. J. Harrison
Summary: By studying a long magnetofossil record from the eastern Indian Ocean, we found coexisting phenomena of magnetic hardening, enlargement, and less oxidation of magnetofossils during glacials compared to interglacials over the past 900,000 years. Our multi-proxy records consistently suggest a recurring decrease in O2 levels in the glacial Indian Ocean, similar to observations in the Atlantic and Pacific during the last glaciation. This repeated oxygen decline strongly supports the hypothesis that increased carbon storage in the Indian Ocean during glacial periods played a significant role in atmospheric CO2 cycling and climate change over recent glacial/interglacial timescales.
NATURE COMMUNICATIONS
(2023)
Editorial Material
Geochemistry & Geophysics
Isabelle Manighetti, Rachel Abercrombie, Yves Bernabe, Michael Bostock, Mark J. Dekkers, Satoshi Ide, Douglas R. Schmitt, Shin-Chan Han, Paul Tregoning
Summary: The editors of JGR-Solid Earth express their gratitude to the peer reviewers who contributed in reviewing articles for the journal in 2022.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Geochemistry & Geophysics
David Heslop, Janice L. Scealy, Andrew T. A. Wood, Lisa Tauxe, Andrew P. Roberts
Summary: Paleomagnetic statistical inference is often hindered by distributional assumptions of parametric null hypothesis tests. To address this, the bootstrap method has been proposed as a nonparametric alternative. However, the current bootstrap test for a common mean direction in paleomagnetic analysis lacks consideration of a null hypothesis. In this study, we integrate recent advances to incorporate bootstrap tests into a null hypothesis significance testing framework, improving interpretability and unifying paleomagnetic statistical tests.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Agriculture, Multidisciplinary
Tatiele Fruett, Alberto Vasconcellos Inda, Vidal Barron, Enilson Luiz Saccol de Sa, Keyrauan Taha, Antonia Finkler Dias Fernandes
Summary: Termites selectively alter the physical and chemical properties of soils in their mound building process. This study in Brazil found that termites prefer clay-sized particles such as kaolinite, gibbsite, and iron oxides over larger particles like quartz. The mounds had increased content of clay fraction, organic carbon, and iron oxides, resulting in specific surface area increments.
