Article
Geochemistry & Geophysics
Tian-Yi Huang, Fang-Zhen Teng, Ze-Zhou Wang, Yong-Sheng He, Zhi-Chao Liu, Fu-Yuan Wu
Summary: To understand the behavior of K isotopes during granitic magmatic differentiation, high-precision K isotope data for bulk granitoids and their K-bearing minerals from the Dabie and Himalayan orogens in China were analyzed. The study found significant variations in K isotopic compositions among different minerals, indicating compositional control on isotope fractionations. The research suggests that K isotopes can be a potential tool for studying the differentiation of felsic magmas.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2023)
Article
Geochemistry & Geophysics
Shanqi Liu, Yongbing Li, Menghan Li, Zhiming Yang, Jianming Liu, Yanan Shen
Summary: Fe, Ni, and S isotopes are important chemical tracers that complement each other to improve our understanding of Earth's evolution. This study investigates the equilibrium fractionation factors of Fe, Ni, and S isotopes in solid solutions, providing valuable insights into the effect of cation contents on isotopic signatures. The results contribute to a better understanding of physical, chemical, and geo-biological evolution on Earth.
Article
Microbiology
Anna-Neva Visser, Scott D. D. Wankel, Claudia Frey, Andreas Kappler, Moritz F. F. Lehmann
Summary: In this study, the effect of different organic substrates (short-chained organic acids) and the presence/absence of Fe(II) on nitrogen and oxygen isotope fractionation dynamics during nitrate and nitrite reduction were investigated. The results showed that the isotope effects obtained under heterotrophic and mixotrophic growth conditions were very similar and consistent with previous studies, indicating a lack of distinct differences caused by organic substrates and Fe(II).
FRONTIERS IN MICROBIOLOGY
(2022)
Article
Geochemistry & Geophysics
Crayton J. Yapp
Summary: This study investigates the isotope fractionation effects of oxygen and hydrogen in goethite synthesized under low and high pH conditions, and their relationships with pH and temperature. The study finds that there are differences in the effects of pH and temperature on 18agt-w, which may be attributed to the distinct exchangeabilities of transitional Fe(III) hydroxides on the growing surfaces of goethite. These findings are important for interpreting the isotope values of goethite in paleoenvironmental studies.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Geochemistry & Geophysics
Liam Hoare, Martijn Klaver, Duncan D. Muir, Stephan Klemme, Jane Barling, Ian J. Parkinson, C. Johan Lissenberg, Marc-Alban Millet
Summary: The titanium isotope compositions of different types of rocks, as well as the variations during magmatic differentiation, are discussed in this study. It is found that felsic rocks have heavier titanium isotope compositions compared to mafic rocks, and alkaline magmas have heavier titanium isotope compositions compared to other magma series. The preferential sequestration of light titanium isotopes in Fe-Ti oxides, such as rutile, ilmenite, and titanomagnetite, is suggested as the underlying mechanism for these observations.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Geochemistry & Geophysics
Lie-Meng Chen, Fang-Zhen Teng, Xie-Yan Song, Yan Luan, Song-Yue Yu, Jian Kang
Summary: By studying the Mg isotopic compositions of magnetite in the Baima layered mafic intrusion in Southwest China, large variations of Mg isotopes were observed in oxide-rich and oxide-barren rocks. The mechanisms controlling the Mg isotopic variation differ between the two rock types, highlighting the importance of different processes in governing the isotopic variations in magmatic Fe-Ti oxides in layered mafic intrusions.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2021)
Article
Geosciences, Multidisciplinary
Markus C. Leuenberger, Shyam Ranjan
Summary: Since 1971, water isotope measurements have been conducted at various locations in Switzerland by the Climate and Environmental Physics Division at the University of Bern. The study investigates the effects of meteorological parameters such as temperature, turbulence factor, and humidity on the water isotopes through the analysis of isotope ratios.
FRONTIERS IN EARTH SCIENCE
(2021)
Article
Geochemistry & Geophysics
Jun-Lin Wang, Hai-Zhen Wei, A. E. Williams-Jones, Ge Dong, Yuan-Feng Zhu, Shao-Yong Jiang, Jing Ma, Simon Hohl, Xi Liu, Yin-Chuan Li, Jian-Jun Lu
Summary: The behavior of silver in hydrothermal ore-forming systems has been studied in terms of equilibrium and Rayleigh-type isotope fractionation. Experimental and theoretical investigations reveal that silver follows a second-order kinetic reaction model during transport and deposition processes, and its isotope fractionation follows a Rayleigh-type fractionation model. A new silver isotope geothermometer is proposed for determining temperature in silver-bearing hydrothermal systems.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Chemistry, Analytical
Lin-Hui Dong, Wei Wei, Cheng-Long Yu, Zhen-Hui Hou, Zhen Zeng, Tianyu Chen, Fang Huang
Summary: A method was developed to measure the delta(V-51) values in marine carbonates, and data for carbonate reference materials were successfully obtained, indicating the high reliability of the method for tracing the evolution of global marine redox states throughout Earth's history.
ANALYTICAL CHEMISTRY
(2021)
Article
Engineering, Environmental
Clara Torrento, Violaine Ponsin, Christina Lihl, Thomas B. Hofstetter, Nicole Baran, Martin Elsner, Daniel Hunkeler
Summary: Although multielement isotope fractionation studies have been well-established for point-source pollution, they are only emerging for diffuse pollution by micropollutants like pesticides. This study found that chlorine isotope fractionation can be a robust indicator of chloroacetanilide degradation, with distinct patterns observed for different degradation pathways. The 3D isotope approach allows for differentiation of transformations that may not be distinguishable based on C and N isotope data alone.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)
Article
Geochemistry & Geophysics
Yonghui Li, Long Li, Zhongqing Wu
Summary: Nitrogen isotopes have been shown to be a powerful tool for studying the geological nitrogen cycle between Earth's reservoirs. This study used first-principles methods to calculate nitrogen isotope fractionations among common minerals in Earth's lithosphere, revealing significant differences in fractionations between nitrate and ammonium groups, as well as smaller fractionations within the ammonium group. The results suggest that nitrogen isotopes can be used to trace material sources and infer geochemical processes, but caution is needed to consider the fractionation differences between different minerals.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2021)
Article
Geology
Zehua Guo, Zenghui Yu, Ke Wang, Shikui Zhai, Huaijing Zhang
Summary: The Okinawa Trough is a natural laboratory for studying basin evolution, magmatism, and crust-mantle interactions. Magmas in the Middle Okinawa Trough and Southern Okinawa Trough are mainly occurring. To investigate the magmatism in the Okinawa Trough, volcanic rock samples from the MOT and SOT were analysed for Fe - Sr - Nd - Pb - Hf isotopic compositions.
INTERNATIONAL GEOLOGY REVIEW
(2023)
Article
Geochemistry & Geophysics
Ji Shen, Zhiwei Zuo, Bing Yang, Dmitri A. Ionov, Wang-Ye Li, Liping Qin
Summary: Previous studies on the Cr isotope composition in the lithospheric mantle have mainly focused on shallow spinel-facies peridotites, and little is known about the Cr isotope composition in the deeper and more voluminous garnet-facies mantle. This study presents Cr isotope data for garnet and spinel peridotite xenoliths from the Siberian craton and eclogites from the Dabie orogen in eastern China, revealing that Cr isotopes are mainly partitioned between garnet and clinopyroxene in peridotites, but non-equilibrium isotope fractionation may occur in certain cases. The Cr isotope composition of peridotites is also correlated with mineral abundances and chemical composition. The results suggest that the Cr isotope composition of garnet peridotites may represent the overall Cr isotope composition of the mantle.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2023)
Article
Geochemistry & Geophysics
Jing-Jing Fan, Qiang Wang, Lin Ma, Jie Li, Xiu-Zheng Zhang, Le Zhang, Zi-Long Wang
Summary: This study investigates the behavior of Mo isotopes in high-SiO2 granites and concludes that fractional crystallization and melt-fluid interaction control Mo isotope fractionation in these rocks. Mo isotopes are useful for tracing the evolution of high-SiO2 igneous rocks.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Geochemistry & Geophysics
Tinggen Yang, Haiyang Liu, Yonghui Li, Ying-Yu Xue, Xiaoqiang Li, Kun Wang, Wei-Dong Sun
Summary: The K isotope compositions of ultrapotassic rocks indicate heavy signatures from slab-derived fluids, while the K isotope fractionation between biotite and microcline agrees with the calculated equilibrium fractionation scale. Amphiboles have heterogeneous K isotope compositions and may be influenced by kinetic fractionation processes. The fractional crystallization of amphibole may not significantly decrease the K isotope composition of the residual melts.
Article
Chemistry, Multidisciplinary
Luiza Notini, Drew E. Latta, Anke Neumann, Carolyn I. Pearce, Michel Sassi, Alpha T. N'Diaye, Kevin M. Rosso, Michelle M. Scherer
ACS EARTH AND SPACE CHEMISTRY
(2019)
Article
Geochemistry & Geophysics
Piyali Chanda, Zhe Zhou, Drew E. Latta, Michelle M. Scherer, Brian L. Beard, Clark M. Johnson
Article
Engineering, Environmental
James Entwistle, Drew E. Latta, Michelle M. Scherer, Anke Neumann
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2019)
Article
Biotechnology & Applied Microbiology
Alex Mayer, Hossein Tavakoli, Ceily Fessel Doan, Azad Heidari, Robert Handler
BIOFUELS BIOPRODUCTS & BIOREFINING-BIOFPR
(2020)
Article
Engineering, Environmental
Amina Grant, Michelle M. Scherer, Danielle Land, David M. Cwiertny, Marc A. Edwards, Jerry Mount, Drew E. Latta
ENVIRONMENTAL SCIENCE & TECHNOLOGY LETTERS
(2020)
Article
Chemistry, Multidisciplinary
Donata Drapanauskaite, Robert M. Handler, Nicholas Fox, Jonas Baltrusaitis
Summary: The study introduces a novel process for producing solid nitrogen fertilizers from liquid biogas production waste as a sustainable alternative to applying liquid digestate directly onto fields. By engineering solid ammonium bicarbonate (NH4HCO3), the process aims for optimized recovery with minimal nitrogen losses. Life cycle assessment results show reduced environmental impacts, particularly in global warming potential and eutrophication potential, compared to conventional liquid digestate application methods.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2021)
Article
Environmental Sciences
Zhe Zhou, Drew E. Latta, Michelle M. Scherer
Summary: The study showed that the presence of natural organic matter (NOM) inhibits the Fe(II)-catalyzed transformation of ferrihydrite (Fh). Nickel associated with SRNOM-Fh was found to be more susceptible to acid extraction compared to Fh in the presence of Fe(II). Transformation to secondary minerals may be necessary for nickel stabilization to occur.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Geochemistry & Geophysics
Edward J. O'Loughlin, Maxim Boyanov, Christopher A. Gorski, Michelle M. Scherer, Kenneth M. Kemner
Summary: The bioreduction of Fe(III) oxides by dissimilatory iron-reducing bacteria leads to the formation of various Fe(II)-bearing secondary minerals, which are influenced by the mineralogy of Fe(III) oxides, phosphate concentration, and the availability of electron shuttles. The overall extent of Fe(II) production and the types of secondary minerals formed are highly dependent on these factors, demonstrating a complex interplay of mineralogical, geochemical, and microbiological factors.
Article
Instruments & Instrumentation
Lara K. Bogart, Jeppe Fock, Geraldo M. da Costa, Kerstin Witte, Jean-Marc Greneche, Jan Zukrowski, Marcin Sikora, Drew E. Latta, Michelle M. Scherer, Mikkel Fougt Hansen, Cathrine Frandsen, Quentin A. Pankhurst
Summary: This study tested the Fe-57 Mossbauer spectrometric 'centre of gravity' method for quantifying the composition ratio of magnetite/maghemite in biphasic magnetic nanoparticles. The results showed that the method is repeatable and the data analysis phase has a minor contribution to the overall measurement uncertainty. Therefore, the COG method is considered a promising and robust candidate.
Article
Environmental Sciences
Darud E. Sheefa, Robert M. Handler, Brian D. Barkdoll
Summary: Flushing the water distribution system with fire hydrants is a common method for decontamination, but it causes environmental impact by discharging contaminated water to the surroundings. To reduce this impact, using a containment pond as an alternative was studied. The results showed that environmental impacts can be significantly reduced in different areas, and the time needed for decontamination and the area of land exposed to contaminated water discharge are the most sensitive variables affecting the impact.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Engineering, Environmental
Thomas C. Robinson, Drew E. Latta, Johna Leddy, Michelle M. Scherer
Summary: Predicting the redox behavior of magnetite in reducing soils and sediments is challenging due to inconsistent measured potentials and the lack of consensus on relevant Fe(III) | Fe(II) equilibria. In this study, we measured open-circuit potentials of stoichiometric magnetite equilibrated under various solution conditions and found Nernstian behavior in certain conditions. Our findings suggest that the maghemite/Fe(II)aq couple accurately predicts the redox behavior of stoichiometric magnetite suspensions in the presence of aqueous Fe(II) between pH values of 6.5 and 8.5. Additionally, a distinct shift in potentials was observed at higher pH values and without added Fe(II), indicating a change in the dominant Fe(III)|Fe(II) couple(s) poising the potential.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Drew Latta, Kevin M. Rosso, Michelle M. Scherer
Summary: The transformation of nanocrystalline ferrihydrite to more stable microcrystalline Fe(III) oxides under reducing conditions with aqueous Fe(II) present is a rapid process. The initial phase of this transformation, involving nucleation and growth of product minerals, remains unclear. This study used Fe isotopes, Mossbauer spectroscopy, and extractions to track the interactions between ferrihydrite and Fe(II) during this initial phase. The findings suggest that the mineralogical changes during the initial lag phase are critical to understanding ferrihydrite behavior in soils and sediments, particularly in relation to metal uptake and release.
ACS EARTH AND SPACE CHEMISTRY
(2023)
Article
Chemistry, Analytical
Thomas C. Robinson, Drew E. Latta, Luiza Notini, Keith E. Schilling, Michelle M. Scherer
Summary: The abiotic reduction of nitrite by Fe(II) species has been shown to be a significant source of atmospheric nitrous oxide emissions. However, the rates of chemodenitrification and N2O yields vary among different Fe(II) species, and the competition between abiotic and biological nitrite reduction is still unclear. Our study found significant variations in nitrite reduction rates and N2O recovery among Fe(II) species, suggesting that both chemodenitrification and biological denitrification may occur simultaneously in redox active sediments and soils.
ENVIRONMENTAL SCIENCE-PROCESSES & IMPACTS
(2021)
Editorial Material
Environmental Studies
Erin C. Pischke, Robert M. Handler, Jessie L. Knowlton
RESEARCH AGENDA FOR ENVIRONMENTAL MANAGEMENT
(2019)
Proceedings Paper
Engineering, Industrial
David Shonnard, Emily Tipaldo, Vicki Thompson, Joshua Pearce, Gerard Caneba, Robert Handler
26TH CIRP CONFERENCE ON LIFE CYCLE ENGINEERING (LCE)
(2019)
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)