Article
Food Science & Technology
Shanshan Li, Yinfeng Li, Wenyin Wang, Jianxin Jiao, Allan Degen, Tao Zhang, Yanfu Bai, Jingxue Zhao, Michael Kreuzer, Zhanhuan Shang
Summary: This study investigates the influence of remoteness and globalization on dietary habits of pastoralists using isotopic analysis. The results show that dietary habits differ between easily accessible and remote areas, with easily accessible areas being more influenced by external food sources and deviating from the local ecological chain.
FOOD RESEARCH INTERNATIONAL
(2023)
Article
Agronomy
Yuntao Wu, Xiaodong Zhang, Zhaoliang Song, Changxun Yu, Man Liu, Yidong Wang, Qian Hao, Qiang Li, Xiangwei Zhao, Lele Wu, Xia Wang
Summary: This study investigates the spatial patterns and driving factors of carbon and nitrogen isotopes in plant-soil systems of grasslands in northern China. The results provide important references for future research on biogeochemical cycles in temperate grasslands.
Article
Geochemistry & Geophysics
Mei Yan Lai, Thomas Stachel, Richard A. Stern, Kan Li, D. Graham Pearson, Jeff W. Harris
Summary: Through examining 16 diamonds with eclogitic garnet inclusions from the Koidu kimberlite complex in Sierra Leone, it was found that the garnet inclusions have high oxygen isotope values, indicating a link to protoliths that had undergone extensive low-temperature alteration by seawater. The carbon and nitrogen isotope compositions of the host diamonds suggest that diamond formation is associated with an external, mantle-derived fluid.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2023)
Article
Geochemistry & Geophysics
R. Salerno, J. Vervoort, C. Fisher, A. Kemp, N. Roberts
Summary: The initial Hf and Nd isotope compositions of Earth's oldest rocks show that the granites were derived from a chondritic source without a strongly depleted mantle or enriched crustal source. The Lu-Hf and Sm-Nd isotope systems in the Pilbara samples are in full agreement, contrasting with previous records of decoupled Hf and Nd isotope compositions in Eo-Paleoarchean terranes. Integrated age-isotope approach can help assess the integrity of bulk-rock Nd isotope data through examination of Sm-Nd isotope systematics in accessory minerals.
EARTH AND PLANETARY SCIENCE LETTERS
(2021)
Article
Fisheries
Jesaias Ismael da Costa, Dalton Jose Carneiro, Ana Cristina Oliveira, Rosangela Kiyoko Jomori, Maria Inez Martins
Summary: This study evaluated the contribution of plankton to the production of tambaqui juveniles in ponds at different stocking densities. The results showed that plankton accounted for 22.75% of the fish biomass. Density had an impact on turbidity and Secchi, while final biomass and average density were the only zootechnical indexes that differed.
AQUACULTURE INTERNATIONAL
(2023)
Article
Plant Sciences
Guangxu Zhu, Dandan Cheng, Xingfeng Wang, QingJun Guo, Qian Zhang, Jun Zhang, Qiang Tu, WangJun Li
Summary: Cadmium toxicity affects the growth and metabolic processes of castor plants, but different castor species exhibit varying tolerance and accumulation abilities under cadmium stress. Cadmium stress causes changes in the levels of free amino acids, carbon isotopes, and nitrogen isotopes in plants, which can serve as monitoring tools for heavy metal stress.
PLANT PHYSIOLOGY AND BIOCHEMISTRY
(2022)
Article
Geochemistry & Geophysics
Eva E. Stueken, Kristoffer Szilas, Vincent J. van Hinsberg
Summary: A newly discovered hydrothermal graphite deposit in Greenland displays low nitrogen concentrations, indicating an abiotic origin. However, high nitrogen concentrations found in graphitic metapelites suggest a possible link to biomass breakdown. Potassic silicates associated with graphite can thus serve as an indirect biosignature.
Article
Environmental Sciences
Lizeng Duan, Hucai Zhang, Fengqin Chang, Donglin Li, Qi Liu, Xiaonan Zhang, Fengwen Liu, Yang Zhang
Summary: Lake sediment is an important carbon reservoir, and its distribution is influenced by trophic state and terrestrial input, resulting in different patterns of organic matter sources in different lakes.
JOURNAL OF SOILS AND SEDIMENTS
(2022)
Article
Geochemistry & Geophysics
Luisa D. V. Carvalho, Thomas Stachel, Graham Pearson, Suzette Timmerman, Richard A. Stern, Tiago Jalowitzki, Ricardo Scholz, Reinhardt A. Fuck
Summary: The presence of diamonds in alluvial deposits on the southwestern edge of the S & atilde;o Francisco Craton indicates the influence of subducted oceanic crust on the local mantle. The study of carbon and nitrogen isotope compositions of diamonds, as well as oxygen isotope compositions of their inclusion, reveals the contribution of different sources in the formation of diamonds, including altered oceanic crust and Earth's mantle. The isotopic signatures suggest that diamond-forming fluids may have originated from shallow oceanic crust and interacted with eclogitized substrates in deeper levels of oceanic crust. The research provides insight into diamond formation processes in subducted slabs and the subcontinental lithospheric mantle.
Article
Environmental Sciences
Hong-Duck Ryu, Sun-Jung Kim, Un-il Baek, Deok-Woo Kim, Hyun-Jeoung Lee, Eu Gene Chung, Min-Seob Kim, Kyunghyun Kim, Jae Kwan Lee
Summary: A novel approach using dual ammonium and nitrate nitrogen isotope ratios was proposed to identify nitrogen sources in intensive livestock farming watersheds, showing that seasonal patterns of delta N-15(NH4) and delta N-15(NO3) can reflect nitrogen pollution from agricultural activities. The study revealed that microbial nitrification is the dominant nitrogen transformation process in the river, and the dual delta N-15(NH4) and delta N-15(NO3) axes provide better results compared to traditional methods for identifying nitrogen sources in agricultural watersheds with swine excreta treatment facilities.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Filip Oulehle, Christine L. Goodale, Christopher D. Evans, Tomas Chuman, Jakub Hruska, Pavel Kram, Tomas Navratil, Miroslav Tesar, Alexandr Ac, Otmar Urban, Karolina Tahovska
Summary: Global nitrogen deposition to forests can alleviate ecosystem N limitation, but better quantification of nitrogen fluxes is needed to predict the consequences. Studies in central Europe reveal that dissolved N losses in streams are related to nutrient stoichiometry, while soil N storage is linked to iron and aluminium content. Gaseous N losses are influenced by forest floor N:P ratio and dissolved N losses, and a relationship between gaseous and dissolved N losses can explain N loss rates in tropical and subtropical catchments, driven by nitrate abundance. Extrapolating globally, current gaseous N losses from forests are estimated to be 8.9 Tg N yr(-1), representing 39% of current N deposition to forests.
ENVIRONMENTAL RESEARCH LETTERS
(2021)
Article
Geosciences, Multidisciplinary
M. Ingalls, J. P. Grotzinger, T. Present, B. Rasmussen, W. W. Fischer
Summary: Phosphorus is crucial for cell biology, but it is scarce in modern marine environments due to its consumption by life or formation of apatite minerals through calcium titration. In this study, we measured the phosphate concentrations in Neoarchean carbonate facies and found that carbonates from that period were significantly enriched in carbonate-associated phosphate compared to modern marine carbonates. This suggests that early biosphere productivity was limited by electron availability rather than phosphate or other nutrients, which helps explain the central role of phosphorus in cellular molecules, metabolisms, and bioenergetics.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geosciences, Multidisciplinary
Mathilde Mercuzot, Christophe Thomazo, Johann Schnyder, Pierre Pellenard, Francois Baudin, Anne-Catherine Pierson-Wickmann, Pierre Sans-Jofre, Sylvie Bourquin, Laurent Beccaletto, Anne-Lise Santoni, Georges Gand, Matthieu Buisson, Laure Gle, Thomas Munier, Antonios Saloume, Mohamed Boussaid, Tracy Boucher
Summary: By analyzing the organic-rich sedimentary successions from the late Carboniferous to early Permian, the study highlights the relationship between geodynamics and climate change during the late-orogenic period. Different origins of organic matter were identified, with high organic matter storage events possibly resulting from secondary processes.
FRONTIERS IN EARTH SCIENCE
(2021)
Article
Environmental Sciences
Bo Kyung Kim, Misa Jeon, Sang-Jong Park, Hyun-Cheol Kim, Jun-Oh Min, Jisoo Park, Sun-Yong Ha
Summary: Quantifying the temporal variability in phytoplankton productivity is crucial for understanding carbon and nitrogen dynamics in aquatic ecosystems. A study conducted in Marian Cove, Antarctica, found significant fluctuations in phytoplankton C and N uptake, which were strongly influenced by external forces such as wind stress.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Geochemistry & Geophysics
Xing-yu Huang, Dong Zhang, Zhi-qi Zhao, Yun-tao Liu, Hong-qi Meng, Shuang Zou, Bing-juan Ma, Qi-yan Feng
Summary: It was found that untreated manure and domestic sewage are the primary sources of nitrate in groundwater in a residential area. The study also highlighted the impact of different sources on groundwater nitrate levels, including manure/sewage, precipitation, soil nitrogen, and synthetic fertilizer. The multiple isotopes confirmed the nitrate pollution sources and pathways in residential areas.
JOURNAL OF GEOCHEMICAL EXPLORATION
(2021)
Article
Geochemistry & Geophysics
B. A. Killingsworth, P. Cartigny, J. A. Hayles, C. Thomazo, P. Sansjofre, V Pasquier, S. Lalonde, P. Philippot
Summary: Triple oxygen isotope signals are useful for studying modern and ancient weathering, hydrology, atmospheric gas concentrations, and bioproductivity, but interpretations of the sulfate-water-O-2 system must consider varying oxygen-isotope fractionations. By anchoring the systematics on the homogeneous composition of atmospheric O(2) through empirical constraints and modeling, new insights without a priori assumptions are gained for the response of the biological carbon cycle to high CO2 concentrations on the early Earth.
Article
Geochemistry & Geophysics
E. M. Bloch, M. C. Jollands, P. Tollan, F. Plane, A-S Bouvier, R. Hervig, A. J. Berry, C. Zaubitzer, S. Escrig, O. Muntener, M. Ibanez-Mejia, J. Alleon, A. Meibom, L. P. Baumgartner, J. Marin-Carbonne, M. Newville
Summary: Ti-in-zircon diffusion shows strong anisotropy, with diffusion parallel to the c-axis being 4-5 orders of magnitude faster than diffusion perpendicular to the c-axis. This difference increases at lower temperatures. Considering the possible effects of diffusion, temperatures calculated using the Ti-in-zircon thermometer should be evaluated on an individual basis under certain crustal conditions.
EARTH AND PLANETARY SCIENCE LETTERS
(2022)
Article
Biology
Pierre Cadeau, Pierre Cartigny, Christophe Thomazo, Didier Jezequel, Christophe Leboulanger, Gerard Sarazin, Magali Ader
Summary: The study observed a rare strong positive sulfur isotope signature in modern seawater and proposed that the superheavy pyrite feature is the result of a two-stage evolution of the sulfur biogeochemical cycle, which can form similar sulfur isotope signatures in sulfate-poor and highly productive environments.
Article
Geochemistry & Geophysics
Martin Guitreau, Abdelmouhcine Gannoun, Zhengbin Deng, Marc Chaussidon, Frederic Moynier, Bernard Barbarin, Johanna Marin-Carbonne
Summary: This study investigates the silicon isotope signatures of zircon in various granite types to understand their fractionation behavior, which can be useful in studying magma evolution and identifying granite source areas. Silicon isotope ratios in zircon can track changes in magma temperature and composition, revealing complex processes like magma mingling, fractional crystallization, and multiple sources. The study highlights that silicon isotopes in zircon can complement existing techniques in granite studies and should not be used in isolation.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Editorial Material
Geosciences, Multidisciplinary
Masafumi Saitoh, Nicolas Olivier, Marion Garcon, Maud Boyet, Christophe Thomazo, Julien Alleon, Jean-Francois Moyen, Vincent Motto-Ros, Johanna Marin-Carbonne
PRECAMBRIAN RESEARCH
(2022)
Article
Geochemistry & Geophysics
J. Marin-Carbonne, M. -N. Decraene, R. Havas, L. Remusat, V. Pasquier, J. Alleon, N. Zeyen, A. Bouton, S. Bernard, S. Escrig, N. Olivier, E. Vennin, A. Meibom, K. Benzerara, C. Thomazo
Summary: Microbialites are organosedimentary rocks that have occurred throughout the Earth's history. The isotopic compositions of sulfur in pyrites within these microbialites provide important information about microbial sulfur cycling and local micro-environments.
GEOCHEMICAL PERSPECTIVES LETTERS
(2022)
Article
Biology
Alice Pellerin, Christophe Thomazo, Magali Ader, Johanna Marin-Carbonne, Julien Alleon, Emmanuelle Vennin, Axel Hofmann
Summary: The nitrogen isotopic composition of organic matter is used to study the early evolution of life and ocean oxygenation. This study provides valuable data on carbon and nitrogen concentrations and isotopic compositions in ancient sedimentary rocks. The positive delta N-15 values suggest the presence of a stable nitrate pool formed through non-quantitative oxidation of ammonium via the Feammox pathway.
Article
Geochemistry & Geophysics
David O. Zakharov, Johanna Marin-Carbonne, Andreas Pack, Tommaso Di Rocco, Martin Robyr, Torsten Vennemann
Summary: This study investigates the influence of marine diagenesis on the isotope composition of cherts obtained from deep-sea drilling. The results reveal significant ambiguity in interpreting seawater evolution due to the complex effect of diagenesis. The study also highlights the correlation between isotopic composition and petrographic features of cherts.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2023)
Article
Geochemistry & Geophysics
Frantz Ossa Ossa, Marie-Laure Pons, Andrey Bekker, Axel Hofmann, Simon W. Poulton, Morten B. Andersen, Andrea Agangi, Daniel Gregory, Christian Reinke, Bernd Steinhilber, Johanna Marin-Carbonne, Ronny Schoenberg
Summary: By analyzing trace metal concentration and zinc isotope data of pyritized structures in the 2.1 billion-year-old Francevillian Group, it is suggested that eukaryotes may have utilized metalloenzymes in marine habitats with high concentrations of zinc, cobalt, and nickel. This finding challenges the widely accepted timeline of eukaryogenesis and suggests that this major evolutionary innovation may have occurred contemporaneously with elevated atmospheric oxygen levels during the Great Oxidation Event.
EARTH AND PLANETARY SCIENCE LETTERS
(2023)
Article
Geochemistry & Geophysics
Johanna Marin-Carbonne, Kevin D. McKeegan, Andrew M. Davis, Glenn J. MacPherson, Ruslan A. Mendybaev, Frank M. Richter
Summary: Oxygen, magnesium, and silicon isotopic abundances in Vigarano 1623-5 were studied to investigate correlations with petrology. The inclusion displayed mass-dependent fractionation effects, consistent with Rayleigh distillation during melt evaporation. However, the enriched chemical composition suggests prior fractionation. A discontinuous igneous rim and isotopic exchange events were observed, indicating mechanical fragmentation and reassembly. Evidence of live Al-26 was found in Al-rich minerals, but its implications are unclear.
METEORITICS & PLANETARY SCIENCE
(2023)
Article
Geography, Physical
Marie-Noelle Decraene, Johanna Marin-Carbonne, Christophe Thomazo, Arnaud Brayard, Anne-Sophie Bouvier, Brahimsamba Bomou, Thierry Adatte, Nicolas Olivier
Summary: The late Smithian and the Smithian-Spathian boundary are associated with harsh environmental conditions, and this study reveals the redox changes in marine sediments during this period through Fe and S isotope systematics. The findings indicate that the sedimentary environment and nature of deposits play a crucial role in controlling the Fe isotope compositions and could impact interpretations of the redox state of the ocean after the Permian-Triassic biotic crisis.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2023)
Article
Green & Sustainable Science & Technology
Ana Mercedes Heredia-Velasquez, Ana Giraldo-Silva, Corey Nelson, Julie Bethany, Patrick Kut, Luis Gonzalez-de-Salceda, Ferran Garcia-Pichel
Summary: Arid soils are degrading globally due to anthropogenic stress. Co-operating photovoltaic plants with biocrust nurseries has the potential to restore soil health alongside renewable energy production. The use of solar power plants as ad hoc biocrust nurseries, known as crustivoltaics, can break the scaling barrier of current biocrust restoration technologies, allowing for large-scale restoration.
NATURE SUSTAINABILITY
(2023)
Article
Physics, Multidisciplinary
Alexandre Parriaux, Kamal Hammani, Christophe Thomazo, Olivier Musset, Guy Millot
Summary: We demonstrate the use of dual-comb spectroscopy for isotope ratio measurements, showing that it can be extended to the mid-infrared using a difference frequency generator. The measurements performed show good repeatability and low uncertainty, with results compatible to those obtained by isotope ratio mass spectrometry.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Ecology
Daniel A. Petrash, Ingrid M. Steenbergen, Astolfo Valero, Travis B. Meador, Tomas Paces, Christophe Thomazo
Summary: In the Lake Medard, the reductive Fe(III) dissolution is faster than the sulfide generation from MSR, resulting in ferruginous conditions without quantitative sulfate depletion. This unique feature provides scientific value for studying interlinked biogeochemical cycles during transitional redox states and understanding redox proxy signals of ferruginous sediments underlying a sulfatic and ferruginous water column. The lake also shows substrate competition between iron- and nitrogen-respiring prokaryotes and potential for chemolithotrophic sulfur oxidation.