Article
Geochemistry & Geophysics
Damien Huyghe, Mathieu Daeron, Marc de Rafelis, Dominique Blamart, Mathieu Sebilo, Yves-Marie Paulet, Franck Lartaud
Summary: Clumped-isotope thermometry is an alternative approach for temperature reconstructions of carbonates, utilizing Delta(47) measurements without the need for independent information on the oxygen isotope composition of parent waters. New calibration observations on marine bivalves from various ecosystems reaffirm the efficacy and accuracy of this method for paleoclimatic temperature reconstructions.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Oceanography
Minming Cui, Anand Gnanadesikan
Summary: Copper distribution in the ocean differs from other nutrients like phosphate and silicate. Our study suggests that diatoms in the Southern Ocean play a particularly important role in marine copper distributions. The uptake of copper in the Southern Ocean is substantially higher than in other oceanic regions.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2022)
Article
Geochemistry & Geophysics
Bo Barker Jorgensen
Summary: Microbial communities and geochemical processes play a crucial role in driving major element cycles and controlling the function of marine sediments as a reservoir of organic matter. Sulfate reduction is the dominant anaerobic mineralization pathway globally, supporting aerobic life on Earth. Understanding the sulfur cycle and microbial communities behind it is essential for studying the redox state of our planet.
GEOCHEMICAL PERSPECTIVES
(2021)
Article
Environmental Sciences
Ryan Cloete, Jean C. Loock, Natasha R. van Horsten, Susanne Fietz, Thato N. Mtshali, Helene Planquette, Alakendra N. Roychoudhury
Summary: Winter distributions of dissolved cadmium and particulate cadmium were measured for the first time in the Indian sector of the Southern Ocean, revealing the important role of biological uptake in the biogeochemical cycling of cadmium during winter months, although weaker compared to summer. Distinct, biologically driven changes in cadmium cycling were observed across different latitudinal zones, with surface distributions of cadmium influenced by the preferential uptake and regeneration of diatoms with high cadmium content as well as the upwelling of cadmium-enriched water masses in the Antarctic zone.
FRONTIERS IN MARINE SCIENCE
(2021)
Article
Geochemistry & Geophysics
Chadlin M. Ostrander, Sune G. Nielsen, Hayley J. Gadol, Luciana Villarroel, Scott D. Wankel, Tristan J. Horner, Jerzy Blusztajn, Colleen M. Hansel
Summary: Thallium (Tl) isotopes serve as a valuable tool for studying the history of molecular oxygen in seawater. Understanding the modern Tl isotope cycle is crucial for its application, especially in anoxic environments. This study found significant variability in Tl isotopes in short timeframes and observed the association of Tl with sulfide and other metals. The sediment data revealed limited isotopic variability, indicating the ability of sediments to capture the Tl isotope composition of contemporary waters.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2023)
Article
Geosciences, Multidisciplinary
Young Ji Joo, Min Sub Sim, Megan E. Elwood Madden, Gerilyn S. Soreghan
Summary: An imbalance in pyrite weathering and burial is a primary mechanism responsible for oxygenation of the atmosphere and oceans. This study investigates the terrestrial sulfur cycle and finds evidence of sulfur isotope discrimination in a glacier-fed catchment in Norway. Global models also suggest previously overlooked pyrite burial with modest isotope fractionation. These results indicate a significant sulfur sink in terrestrial environments.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Environmental Sciences
Sarah B. orberg, Carlos M. Duarte, Nathan R. Geraldi, Mikael K. Sejr, Susse Wegeberg, Jorgen L. S. Hansen, Dorte Krause-Jensen
Summary: By using environmental DNA (eDNA) fingerprinting, we tested the contribution of macroalgae to carbon stocks in arctic marine sediments. We found that macroalgae were prevalent in sediment samples from both nearshore and offshore areas, with brown algae being the main contributor. Stable isotope analysis also showed a significant contribution from macroalgae in sediments. Overall, our findings provide evidence for the prevalent contribution of macroalgal forests to sediment carbon stocks in the Arctic.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Review
Environmental Sciences
Yinghan Lu, Hailin Yang, Baoqi Huang, Yujia Liu, Hailong Lu
Summary: This study provides a comprehensive overview of the manifestations of foraminifera in cold seep environments and methane seepage activities. Certain taxa of benthic foraminifera are known to inhabit geochemical conditions induced by methane-rich environments and may feed on associated methanotrophic microbial communities. Secondary mineralization on foraminifera shells is a widespread manifestation in seep sediments, and alters the microstructure, elementary composition, and isotopic signatures of foraminifera.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Geochemistry & Geophysics
Yan Yuan, Tianyu Chen, Feifei Zhang, Yuanyuan Liu, Guolin Xiong, Guang-Yi Wei, Tais W. Dahl, Wen Yan, Hong-Fei Ling, Hai Cheng, Shu-Zhong Shen
Summary: The uranium isotope ratio in marine carbonates is an important tool for reconstructing past oceanic redox conditions. However, diagenetic processes may complicate this proxy by introducing isotopically heavy uranium into the carbonates. This study quantifies the valence states of trace amounts of uranium in geological carbonate samples and finds that modern coral carbonates faithfully record uranium from seawater. Surprisingly, drill core samples from a modern coral carbonate platform show a significant positive correlation between a specific valence state of uranium and the uranium isotope ratio, suggesting the presence of this valence state in marine carbonates and its influence on the uranium isotope ratio. The study suggests that coupled valence and isotope analyses of uranium in marine carbonates could provide critical constraints for reconstructing marine redox evolution.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2023)
Review
Engineering, Environmental
Jinting Wang, Ji Dai, Guanghao Chen, Feng Jiang
Summary: Estuaries serve as sinks for mercury, where methylmercury, the most toxic form of mercury, is produced by methylators and accumulates in sediments. The sulfur cycle triggers the formation of methylmercury through activating methylator activities and limiting mercury bioavailability, thereby promoting or inhibiting methylmercury formation at different sulfur speciation concentrations.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Environmental Sciences
Naoya Kanna, Shin Sugiyama, Takuto Ando, Yefan Wang, Yuta Sakuragi, Toya Hazumi, Kohei Matsuno, Atsushi Yamaguchi, Jun Nishioka, Youhei Yamashita
Summary: An increasing body of work has shown the potential impacts of subglacial discharge from marine-terminating glaciers on the marine environment around Greenland. Upwelling of nutrients associated with rising buoyant plumes near the front of marine-terminating glaciers plays a key role in maintaining the high productivity of connected fjords. However, the response of protist communities to subglacial discharges into fjords remains poorly understood.
GLOBAL BIOGEOCHEMICAL CYCLES
(2022)
Article
Geochemistry & Geophysics
Xue-Gang Chen, Dagmara Rusiecka, Martha Gledhill, Angela Milne, Amber L. Annett, Aaron Joseph Beck, Antony J. Birchill, Maeve C. Lohan, Simon Ussher, Eric P. Achterberg
Summary: This article reports the spatial and seasonal distributions of dissolved trace metals (dTMs) including iron (Fe), manganese (Mn), and cobalt (Co) on the Northeast Atlantic continental margin (Celtic Sea). The study found that waters on the continental shelf had much higher dTM concentrations than on the slope, attributed to strong contributions from riverine discharge. The combined effects of fluvial and benthic sources, topographical controls, and biological processes shape the seasonal variations of dTM distributions.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2023)
Article
Multidisciplinary Sciences
L. Li Vigni, K. Daskalopoulou, S. Calabrese, L. Brusca, S. Bellomo, C. Cardellini, K. Kyriakopoulos, F. Brugnone, F. Parello, W. D'Alessandro
Summary: Karst hydrosystems in Greece are a significant drinking water resource, but they are highly vulnerable to pollution due to climate change, population density, and industrial/agricultural activities. Chemical analysis of 172 karst springs indicates that they generally meet EU drinking water standards, with some exceptions such as elevated nitrate concentrations in coastal areas. Overall, Greek karst waters are a good quality resource, with the main issues being seawater intrusion and nitrate pollution.
SCIENTIFIC REPORTS
(2023)
Article
Geochemistry & Geophysics
Wenshuai Li, Xiao-Ming Liu, Kun Wang, James McManus, Brian A. Haley, Yoshio Takahashi, Mohsen Shakouri, Yongfeng Hu
Summary: This study investigates the importance of potassium budgets and isotope compositions in marine sedimentary rocks for the global potassium cycling, highlighting the interplay between continental weathering and marine sedimentary diagenesis, which influences the distribution of potassium in seawater through the mineral phases, origins, and isotopic compositions in rocks.
EARTH AND PLANETARY SCIENCE LETTERS
(2022)
Review
Engineering, Environmental
Yueming Wu, Zhanrui Leng, Jian Li, Chongling Yan, Xinhong Wang, Hui Jia, Lingyun Chen, Sai Zhang, Xiaojun Zheng, Daolin Du
Summary: The interactions and mechanisms between sulfur and heavy metals in coastal wetlands are attracting increasing attention in biogeochemical studies. However, there is currently no systematic review article summarizing the impact of sulfur on the bioavailability of heavy metals in these ecosystems. This review summarizes the studies published in the past four decades and highlights the major achievements in this field.
FRONTIERS OF ENVIRONMENTAL SCIENCE & ENGINEERING
(2022)
Article
Geochemistry & Geophysics
Alexander J. Dickson, Hugh C. Jenkyns, Erdem Idiz, Tim C. Sweere, Melissa J. Murphy, Sander H. J. M. van den Boorn, Micha Ruhl, James S. Eldrett, Donald Porcelli
Summary: The study analyzed the molybdenum isotope record in sediments deposited in the southern Cretaceous Western Interior Seaway during OAE 2, finding that there were only minor changes in oceanic deoxygenation during one of the most extreme intervals of global deoxygenation in the Late Phanerozoic.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2021)
Article
Geochemistry & Geophysics
Alexander J. Dickson, Marie-Laure Bagard, Joachim A. R. Katchinoff, Marc Davies, Simon W. Poulton, Anthony S. Cohen
Summary: During the Eocene-Oligocene climate transition, there was a multi-million-year decrease in global temperatures along with large reorganizations to ocean circulation, ocean chemistry and biological productivity. Research indicates that euxinic conditions developed in the Austrian Molasse Basin during this time, and the global extent of sulfidic conditions during the EOT was not significantly different from the Early Eocene greenhouse world.
EARTH AND PLANETARY SCIENCE LETTERS
(2021)
Article
Geochemistry & Geophysics
Yu-Te Hsieha, Robert Paver, Jani T. I. Tanzil, Luke Bridgestock, Jen Nie Lee, Gideon M. Henderson
Summary: This study presents the first multicolony Ba isotope calibration from three shallow-water coral colonies and investigates the potential application of Ba isotopes in reconstructing surface water salinity variability in the Singapore Strait. The results demonstrate that Ba isotopes in coral skeletons can be used to trace water mass mixing driven by monsoon and reflect changes in regional water mass mixing.
EARTH AND PLANETARY SCIENCE LETTERS
(2022)
Article
Geography, Physical
Stephanie Heath, Brenda L. Hall, George H. Denton, Gideon M. Henderson, Chris H. Hendy
Summary: An understanding of Antarctic Ice Sheet (AIS) behavior is crucial for predicting future sea-level rise. This study investigates the ice-sheet history in the McMurdo Sound region of the western Ross Sea over the past two glacial cycles. The findings suggest that ice expansion in this area is driven by low Antarctic air temperatures, potentially influenced by ocean dynamics. Moreover, the timing of ice retreat and maximum extent differs from global events, indicating the impact of accumulation on ice-sheet mass balance.
QUATERNARY SCIENCE REVIEWS
(2022)
Article
Multidisciplinary Sciences
Shraddha T. Band, M. G. Yadava, Nikita Kaushal, M. Midhun, Kaustubh Thirumalai, Timmy Francis, Amzad Laskar, R. Ramesh, Gideon M. Henderson, A. C. Narayana
Summary: This article explores the variability of the Indian Summer Monsoon through the study of stalagmites from Belum Cave, revealing a correlation between monsoon intensity and temperature changes in the Southern Hemisphere, providing valuable insights into the evolution of wind strength.
SCIENTIFIC REPORTS
(2022)
Article
Geochemistry & Geophysics
F. L. Buckingham, G. M. Henderson, P. Holdship, P. Renforth
Summary: This study evaluates the potential of enhanced weathering as a CO2 removal technique by simulating field conditions in a controlled setting. The results show that a one-time application of crushed basalt can release alkalinity and remove CO2 from UK soils, but repeated application may cause irreversible changes to soil compositions.
APPLIED GEOCHEMISTRY
(2022)
Article
Environmental Sciences
Luke Bridgestock, Gideon M. Henderson, Phil Holdship, Aung Myo Khaing, Tin Tin Naing, Tin Aung Myint, Wint Wint Htun, Win Khant, Win Myo Thu, Mo Aung Nay Chi, J. Jotautas Baronas, Edward Tipper, Hazel Chapman, Mike Bickle
Summary: The Irrawaddy and Salween rivers play a crucial role in supplying dissolved and particulate material to the ocean globally, as well as being vital for water sources and food production in Myanmar. Their chemistry is poorly known, but they contribute significantly to global biogeochemical cycles, with dissolved riverine fluxes for studied elements ranging from 1 to 17% globally. The dataset presented provides a useful baseline for assessing future perturbations driven by climate change or Myanmar's mining industry, with exceptions noted in certain elements suggesting anthropogenic impacts.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Jack Longman, Johan C. Faust, Casey Bryce, William B. Homoky, Christian Maerz
Summary: Bonding organic carbon with reactive iron (OC-Fe-R) enhances its preservation in marine and terrestrial deposits. The proportion of OC stored as OC-Fe-R varies globally, with marine sediments containing roughly 20% and Quaternary terrestrial deposits containing roughly 40% of their OC as OC-Fe-R. This study provides a new assessment of global OC-Fe-R burial rates, estimating the marine sink to be between 31 and 70 Mt C yr(-1) and the terrestrial sink to be between 146 and 917 Mt C yr(-1). The primary settings of OC-Fe-R burial are continental shelves and deltaic/estuarine environments in marine settings, and croplands and grasslands on land.
GLOBAL BIOGEOCHEMICAL CYCLES
(2022)
Article
Geochemistry & Geophysics
K. J. Harrington, R. G. Hilton, G. M. Henderson
Summary: Enhanced silicate weathering is a potential negative emissions technology that involves applying crushed calcium and magnesium-rich rocks to cropland to reduce atmospheric CO2. However, the presence of secondary carbonate precipitation during the riverine transport of the weathering products may release CO2, thus reducing the net carbon dioxide removal potential of this mitigation strategy.
APPLIED GEOCHEMISTRY
(2023)
Editorial Material
Geochemistry & Geophysics
F. L. Buckingham, G. M. Henderson, P. Renforth
APPLIED GEOCHEMISTRY
(2023)
Article
Geochemistry & Geophysics
Jack Longman, Ann G. Dunlea, Philipp Boening, Martin R. Palmer, Thomas M. Gernon, James McManus, Hayley R. Manners, William B. Homoky, Katharina Pahnke
Summary: This study investigates the geochemical and Fe isotopic composition of tephra layers, sediments, and mixed tephra-sediment samples from the Montserrat region in the Caribbean Sea. The research finds that buried tephras with diagenesis have lighter Fe isotopic compositions compared to fresh tephra. Non-reductive dissolution of tephra is identified as the likely cause for the retention of these light Fe isotopic compositions.
EARTH AND PLANETARY SCIENCE LETTERS
(2023)
Article
Geosciences, Multidisciplinary
Mingyu Zhao, Benjamin J. W. Mills, William B. B. Homoky, Caroline L. L. Peacock
Summary: Photosynthesis produces molecular oxygen, but the burial of organic carbon in sediments is crucial for the accumulation of oxygen in Earth's atmosphere. This study investigates the impact of mineral-organic preservation on the oxygenation of the Earth, showing that iron input into the ocean is an independent control on atmosphere-ocean oxygen levels. The inclusion of mineral-organic preservation in assessments of Earth's carbon cycle is important and breaks the link between productivity and organic carbon burial.
Article
Multidisciplinary Sciences
Oliver W. Moore, Lisa Curti, Clare Woulds, James A. Bradley, Peyman Babakhani, Benjamin J. W. Mills, William B. Homoky, Ke-Qing Xiao, Andrew W. Bray, Ben J. Fisher, Majid Kazemian, Burkhard Kaulich, Andrew W. Dale, Caroline L. Peacock
Summary: The balance between degradation and preservation of sedimentary organic carbon is crucial for global carbon and oxygen cycles. However, the relative importance of different mechanisms and environmental conditions contributing to marine sedimentary organic carbon preservation is still unclear. Recent research suggests that iron and manganese ions and minerals can catalyze the Maillard reaction at a significantly faster rate in continental margin sediments, potentially having a substantial impact on global organic carbon preservation over geological time.
Article
Multidisciplinary Sciences
Alessandro Tagliabue, Kristen N. N. Buck, Laura E. E. Sofen, Benjamin S. S. Twining, Olivier Aumont, Philip W. W. Boyd, Salvatore Caprara, William B. B. Homoky, Rod Johnson, Daniela Konig, Daniel C. C. Ohnemus, Bettina Sohst, Peter Sedwick
Summary: Iron is important in regulating the ocean carbon cycle, with organic ligands playing a crucial role in stabilizing dissolved iron concentrations. However, the role of authigenic iron phases and the inconsistencies observed in dissolved iron cycling challenge the primary control of ligands. Through a study in the Bermuda Atlantic Time-series Study (BATS) region, it was found that upper-ocean dissolved iron dynamics are decoupled from ligands, indicating the need for a mechanism that allows dissolved iron to escape ligand stabilization and form a reservoir of settling iron particles. When this mechanism was implemented in a global-scale biogeochemical model, it successfully reproduced seasonal iron-cycle dynamics and global datasets where previous models failed.
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)
