Article
Geochemistry & Geophysics
J. T. Middleton, W. -l. Hong, A. Paytan, M. E. Auro, E. M. Griffith, T. J. Horner
Summary: The barium isotope composition of sedimentary barite is a powerful tool for studying the sources and cycling of barium in marine environments. Ion exchange, particularly in mineral-fluid systems, plays an important role in the fractionation of Ba isotopes in BaSO4. The experiments conducted under marine-relevant conditions reveal the rate and isotopic effect associated with ion exchange in BaSO4-fluid systems.
Article
Materials Science, Multidisciplinary
H. Y. Hah, S. Gray, C. E. Johnson, J. A. Johnson, V Kolesnichenko, P. Kucheryavy, G. Goloverda
Summary: Mono-disperse iron oxide nanoparticles synthesized by high-temperature hydrolysis were studied using Mo center dot ssbauer spectroscopy, revealing a critical diameter of around 11 nm for room temperature superparamagnetism. Particles larger than 11.9 nm exhibited ferrimagnetic properties, while particles smaller than 10.6 nm showed superparamagnetism.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2021)
Article
Geosciences, Multidisciplinary
Daniel H. James, Harold J. Bradbury, Gilad Antler, Zvi Steiner, Alec M. Hutchings, Xiaole Sun, Raoul Saar, Mervyn Greaves, Alexandra Turchyn
Summary: The pore fluid geochemistry data from the Gulf of Aqaba and the Iberian Margin show strong correlations among calcium, magnesium, strontium, and sulfate concentrations, indicating active changes in redox state and pH. Despite changes in other major ions and their isotopic composition, the calcium isotope composition of pore fluid calcium remains relatively stable in our measured profiles.
FRONTIERS IN EARTH SCIENCE
(2021)
Article
Geosciences, Multidisciplinary
Yi Hou, Mark A. Torres
Summary: This study investigates the impact of sedimentation dynamics on the preservation of organic carbon (OC). It finds that internal sedimentation dynamics have a profound influence on OC preservation efficiencies and may create autogenic signals that can obscure signals from external forcings. The simulations match the field observations, suggesting that sedimentation dynamics and their interactions with biogeochemistry are prevalent in nature.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Environmental Sciences
Congli Qin, Dongdong Yao, Cheng Cheng, Huijun Xie, Zhen Hu, Jian Zhang
Summary: Nitrate and sulfate are crucial factors causing eutrophication and black and odorous water, and constructed wetlands serve as the last ecological barrier for effluent treatment. This study explored the simultaneous removal of nitrate and sulfate using different combinations in constructed wetland microcosms. Results showed that zero-valent iron played a key role in the reduction of nitrate and sulfate, leading to efficient removal of these pollutants.
ENVIRONMENTAL RESEARCH
(2022)
Article
Geochemistry & Geophysics
Roger N. Bryant, Theodore M. Present, Anne-Sofie C. Ahm, Harry-Luke O. McClelland, Dan Razionale, Clara L. Blattler
Summary: This study examines the environmental factors driving early marine cementation in the Capitan Reef Complex in West Texas using stable isotope patterns. The results suggest that microbial sulfate reduction and recrystallization of carbonate phases were spatially and temporally coincident, leading to the incorporation of enriched sulfur isotopes in diagenetic calcite. The study also reveals that local diagenetic conditions influenced the extent of sulfur isotopic enrichment in carbonates compared to seawater. Additionally, the sulfate concentration in the Delaware Basin may have been lower during the Permian, resulting in more extensive isotopic evolution during carbonate recrystallization.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Chemistry, Multidisciplinary
Andrea Atrei, Fariba Fahmideh Mahdizadeh, Maria Camilla Baratto, Andrea Scala
Summary: The size, size distribution, and magnetic properties of magnetite nanoparticles prepared under different citrate conditions were investigated by XRD, DLS, EPR, and magnetization measurements. Citrate was found to affect the size and magnetic properties of the nanoparticles, with citrate-coated nanoparticles showing greater stability.
APPLIED SCIENCES-BASEL
(2021)
Article
Geochemistry & Geophysics
David J. Burdige, John P. Christensen
Summary: This study investigated iron biogeochemistry in continental margin sediments along the western side of the Antarctic Peninsula, revealing variations in iron oxide content and properties at different depths, which are crucial for the support of primary productivity in the Southern Ocean.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Geosciences, Multidisciplinary
Zhicheng Lei, Huaimin Xu, Tongwen Jiang, Dezhi Yan
Summary: Understanding the genetic mechanism of calcite cement in shallow marine sandstone can improve the accuracy of reservoir quality prediction. Different growth mechanisms of calcite cements are observed during various burial stages, with changes in luminescence and elemental composition. The study establishes a model for the genetic mechanism and diagenetic evolution path of calcite cements in marine sandstone.
MARINE AND PETROLEUM GEOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Patrick Spaeth, Subhasis Adhikari, Kaveh Lahabi, Martin Dieter Baaske, Yonghui Wang, Michel Orrit
Summary: Magnetic imaging is a versatile tool in the fields of biological and condensed-matter physics. However, existing techniques have limitations. This study combines photothermal microscopy with magnetic circular dichroism to develop a versatile magnetic imaging technique using visible light. The method works particularly well for single nanoparticles in liquids and allows for magnetic circular dichroism imaging.
Article
Geosciences, Multidisciplinary
Renata E. B. Araujo, Vincenzo La Bruna, Andrea Rustichelli, Milton M. Xavier, Fabrizio Agosta, Francisco H. R. Bezerra, Marcio F. P. Brito, Jose A. Barbosa, Antonio C. D. Antonino
Summary: Karst processes play a critical role in the development of porosity and permeability in carbonate reservoirs and aquifers. This study examines the interaction between fluid flow pathways and diagenesis in an epigenic karst setting in the Potiguar Basin, Brazil. The results demonstrate the importance of karst dissolution in creating karst cavities, and how various types of porosity can be connected to fractures, veins, and stylolites at the microscale. Additionally, karst dissolution can increase overall rock permeability through cement dissolution and fracturing during different diagenetic stages.
MARINE AND PETROLEUM GEOLOGY
(2023)
Article
Geosciences, Multidisciplinary
Guangwei Wang, Fang Hao, Huayao Zou, Pingping Li
Summary: This study analyzed the stable isotope compositions of calcite cements in carbonate formations from four carbonate fields in the Sichuan Basin. The results showed that some calcite cements had similar δ18O values to their host carbonates, despite forming at high temperatures (>100 degrees C). Petrographic and geochemical analysis indicated that the δ18O-enriched calcites were commonly associated with solid bitumens and had lower δ13C values, suggesting the involvement of thermochemical sulfate reduction. Based on the findings, a model for oxygen isotope behavior during thermochemical sulfate reduction was established.
FRONTIERS IN EARTH SCIENCE
(2023)
Article
Environmental Sciences
Jie Gao, Tianliang Zheng, Yamin Deng, Hongchen Jiang
Summary: The study investigated the processes controlling arsenic mobilization under bacterial sulfate reduction in aquifer sediments, revealing the concurrent occurrence of sulfate, Fe(III), and arsenate reduction. The increase in abundance of sulfate-reducing bacteria facilitated sulfate reduction activity, while the limited ability of newly-formed Fe-sulfide minerals to sequester As led to a transient attenuation followed by re-increase of aqueous As.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Yiping Li, Linda Sarpong, Yue Cheng, Eyram Norgbey, Isaac Kwesi Nooni, Salifu Nasiru, Victor Edem Setordjie, Rachael Abena Bonkuah Duodu, Mawuli Dzakpasu
Summary: Blue-green algae is a problem in Taihu and the seasonal and spatial variations of Sediment Oxygen Demand (SOD) contribute to nutrient growth. Summer values decrease, while winter values increase due to temperature changes. Spring values gradually increase, while autumn values decrease. Further research on carbonaceous sediment oxygen demand (CSOD) in eutrophic Taihu lakes is recommended.
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 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
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
Microbiology
Jinhua Li, Peiyu Liu, Nicolas Menguy, Karim Benzerara, Jinling Bai, Xiang Zhao, Eric Leroy, Chaoqun Zhang, Heng Zhang, Jiawei Liu, Rongrong Zhang, Kelei Zhu, Andrew P. Roberts, Yongxin Pan
Summary: This study proposes a new molecular biology method for identifying and studying magnetotactic bacteria (MTB) in natural environments. The results identify three novel MTB strains and describe their magnetosome biomineralization characteristics. This is significant for expanding our knowledge of MTB and developing strategies for studying uncultured MTB in natural environments.
ENVIRONMENTAL MICROBIOLOGY
(2022)
Article
Geosciences, Multidisciplinary
Udara Amarathunga, Andrew McC Hogg, Eelco J. Rohling, Andrew P. Roberts, Katharine M. Grant, David Heslop, Pengxiang Hu, Diederik Liebrand, Thomas Westerhold, Xiang Zhao, Stewart Gilmore
Summary: A mile-high marine cascade terminated the Messinian salinity crisis 5.33 Myr ago, and flooding caused a massive transfer of salt from the western to the eastern Mediterranean, resulting in hyper-stratification and sapropel deposition.
Article
Geochemistry & Geophysics
Victor A. Piedrahita, Simone Galeotti, Xiang Zhao, Andrew P. Roberts, Eelco J. Rohling, David Heslop, Fabio Florindo, Katharine M. Grant, Laura Rodriguez-Sanz, Daniele Reghellin, Richard E. Zeebe
Summary: This study documents orbital signatures in marine sediments from Contessa Road, Italy, showing orbitally controlled lysocline depth adjustments and orbital phasing of the PETM CIE onset close to both long and short eccentricity maxima. The findings suggest that climate processes associated with orbital forcing of both long and short eccentricity maxima played an important role in triggering the carbon cycle perturbations of all Paleocene-Eocene CIE events.
EARTH AND PLANETARY SCIENCE LETTERS
(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
D. Ellerton, T. M. Rittenour, J. Shulmeister, A. P. Roberts, G. Miot da Silva, A. Gontz, P. A. Hesp, P. Moss, N. Patton, T. Santini, K. Welsh, X. Zhao
Summary: This study used optically stimulated luminescence and palaeomagnetic dating to determine the age of Fraser Island and the adjacent Cooloola Sand Mass. The results showed that they formed between 1.2 Ma and 0.7 Ma, during a global climate reconfiguration. The formation of Fraser Island reduced sediment supply and facilitated the development of the Great Barrier Reef.
Review
Geochemistry & Geophysics
Eelco J. Rohling, Gavin L. Foster, Thomas M. Gernon, Katharine M. Grant, David Heslop, Fiona D. Hibbert, Andrew P. Roberts, Jimin Yu
Summary: Global ice volume and deep-sea temperature are vital indicators of Earth's climate state. This study synthesizes evidence for ice volume and deep-sea temperature variations over the past 40 million years and provides reconstructions and discussions on uncertainties. The study highlights key issues related to glacial state changes and calls for further research.
REVIEWS OF GEOPHYSICS
(2022)
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
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)
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
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)
