Article
Environmental Sciences
Akane Yamakawa, David Amouroux, Emmanuel Tessier, Sylvain Berail, Ina Fettig, Julien P. G. Barre, Jan Koschorreck, Heinz Rudel, Olivier F. X. Donard
Summary: The Hg isotopic composition in spruce shoots mainly consists of gaseous element mercury (GEM) uptake, showing slight changes over a study period of more than 30 years despite a significant decrease in Hg concentration. Mass-dependent fractionation and odd mass-independent isotopic fractionation exhibited slight variations with time.
Article
Chemistry, Analytical
Miao Shi, Bridget A. Bergquist, Anwen Zhou, Yaqiu Zhao, Ruoyu Sun, Jiubin Chen, Wang Zheng
Summary: The efficiency of cold vapor generation (CVG) method for sample introduction in mercury (Hg) isotope analysis and its impact on Hg isotope analysis have been investigated in this study. The efficiency of Hg CVG can be affected by the sample uptake rate, sample matrix, and the design of the gas-liquid separator (GLS). Matrix separation, optimal GLS design, and tuning the sample uptake rate are crucial for obtaining high accuracy and precision in Hg isotope analysis.
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
(2023)
Article
Engineering, Environmental
Junyao Yan, Ruolan Li, Muhammad Ubaid Ali, Chuan Wang, Bo Wang, Xingang Jin, Mingyu Shao, Ping Li, Leiming Zhang, Xinbin Feng
Summary: Mine waste in historical mercury mining areas continuously emits mercury into the local environment, including aquatic ecosystems. This study used data on mercury concentration, speciation, and isotopes to trace mercury migration from the mine waste and determine its contribution to mercury pollution. The findings revealed that rainfall can increase mercury concentrations in river water and influence the partitioning and transport of mercury in karst fissure zones. Despite remediation efforts, the treated mine waste remains a significant source of mercury pollution in local aquatic ecosystems.
Article
Geography, Physical
Dongping Hu, Menghan Li, Jiubin Chen, Qingyong Luo, Stephen E. Grasby, Tonggang Zhang, Shengliu Yuan, Yilun Xu, Stanley C. Finney, Lilin Sun, Yanan Shen
Summary: The Late Ordovician mass extinction was the second most severe Phanerozoic biodiversity crisis, with uncertain triggering and killing mechanisms. Studies have shown mercury enrichments in multiple regions globally during the Late Ordovician, indicating an increase in environmental mercury loading, possibly due to volcanic activity.
GLOBAL AND PLANETARY CHANGE
(2021)
Article
Geochemistry & Geophysics
Lijie Zhang, Xujun Liang, Quanying Wang, Yaoling Zhang, Xiangping Yin, Xia Lu, Eric M. Pierce, Baohua Gu
Summary: This study investigated the isotope exchange between newly spiked and pre-existing Hg(II) in environmental matrices, as well as its impact on Hg(II) transformation and bioaccumulation. The results suggest that isotope exchange may lead to biased rate calculations of Hg(II) transformation and bioaccumulation when enriched Hg isotopes are applied in environmental matrices.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2021)
Review
Geosciences, Multidisciplinary
Sofie Lindstrom, Sara Callegaro, Joshua Davies, Christian Tegner, Bas van de Schootbrugge, Gunver K. Pedersen, Nasrrddine Youbi, Hamed Sanei, Andrea Marzoli
Summary: Various geochemical signals and proxy records have been used to link CAMP volcanic activity to the end-Triassic mass extinction. These records include iridium anomalies, carbon isotope excursions, atmospheric pCO2 changes, and climate cooling events, providing a comprehensive understanding of the events leading to the mass extinction.
EARTH-SCIENCE REVIEWS
(2021)
Article
Environmental Sciences
Lesta S. S. Fletcher, William C. C. Crocker, Hong Zhang
Summary: An alternative method for estimating the kinetics of Hg(II) photoreduction in water was developed using a mass balance box model that took into account the emission of dissolved gaseous mercury (DGM) from water. The model equations were implemented in an interactive Excel spreadsheet to calculate the rate constants and rates of Hg(II) photoreduction. The model calculations used field-measured data of DGM and its emission flux, obtained from a previous year-long field study conducted at Cane Creek Lake in Tennessee. The results showed that the rate constants and rates of Hg(II) photoreduction varied with the seasons, with higher values in the warm season compared to the cold season. The model calculations also indicated that DGM emission had a significant impact on the kinetics of aquatic Hg(II) photoreduction and that the model approach could provide valuable independent estimations.
Article
Engineering, Environmental
Qiang Huang, Xiaoshuai He, Weilin Huang, John R. Reinfelder
Summary: Soot and mercury are both significant air pollutants, and this study found that the presence of soot during the photoreduction of Hg(II) can lead to Hg isotope fractionation. The different conditions result in varying reactions, with mass-independent Hg isotope fractionation observed under different conditions. This research sheds light on the transformational histories of aerosol-bound Hg(II) in the environment.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)
Article
Engineering, Environmental
Lulu Mao, Wenbo Ren, Xitao Liu, Mengchang He, Chunye Lin, Ying Zhong, Yang Tang, Wei Ouyang
Summary: In this study, the total mercury (THg) content and mercury isotope composition in sediments in the Lianxi River, Zijiang River, and South Dongting Lake were investigated to identify and quantify multiple mercury sources and evaluate mercury environmental processes. The results showed that the THg content, delta Hg-202, and Delta Hg-199 values in the sediments varied from 48.22 to 4284.32 μg/kg, 1.33 to 0.04‰, and 0.25 to 0.03‰, respectively. The sediments from the Lianxi River, Zijiang River, and South Dongting Lake exhibited distinct mercury isotope characteristics, indicating significant variations in dominant mercury sources in these regions. Source apportionment based on MixSIAR revealed that mercury in sediments mainly originated from industrial activities, with non-ferrous metal smelting being the dominant industrial mercury contributor in the Lianxi River. Compared to the Lianxi River, the relative contribution of mercury from industrial activities significantly decreased, while the relative contributions of mercury from background releases significantly increased in the Zijiang River and South Dongting Lake.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Yuwei Wang, Gideon Bartov, Thomas Wang, John R. Reinfelder, Thomas M. Johnson, Nathan Yee
Summary: Experimental results showed that Hg stable isotope fractionation can be facilitated by rapid Hg isotopic exchange in Hg(II)-Hg(0) redox systems, and the fractionation is influenced by nuclear volume effects.
ACS EARTH AND SPACE CHEMISTRY
(2021)
Article
Geochemistry & Geophysics
Wang Zheng, Priyanka Chandan, Alexandra Steffen, Geoff Stupple, Joan De Vera, Carl P. J. Mitchell, Frank Wania, Bridget A. Bergquist
Summary: The Arctic plays a critical role in the global mercury (Hg) cycle as both a sink and emerging source of Hg. Human activities have led to significant Hg contamination in the region, highlighting the importance of understanding Hg sources and transformations for predicting global climate change and Hg emissions.
APPLIED GEOCHEMISTRY
(2021)
Article
Environmental Sciences
Celine Albert, Hallvard Strom, Halfdan Helgi Helgason, Vegard Sandoy Brathen, Fannar Theyr Gudmundsson, Paco Bustamante, Jerome Fort
Summary: Knowledge of the ecology and at-sea distribution of migratory species like seabirds has substantially increased over the last two decades. However, the understanding of the combined effects of spatial movements and contamination on seabirds' life-history traits is still scarce.
ENVIRONMENTAL POLLUTION
(2022)
Article
Geosciences, Multidisciplinary
Jessica L. Ball
Summary: This study provides the first direct ages for many maar deposits in the Clear Lake Volcanic Field and establishes a stratigraphic basis for interpreting the eruptive processes and dynamics of these young eruptions. It differentiates between maar eruption products and pyroclastic deposits and identifies six eruption facies based on lithology, grain size parameters, and depositional structures. The findings suggest that collaboration between volcanologists and indigenous historians could contribute a valuable human perspective to understanding the youngest eruptions in the Clear Lake Volcanic Field.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Environmental Sciences
Ju Hyeon Lee, Sae Yun Kwon, Runsheng Yin, Laura C. Motta, Aaron Y. Kurz, Seung-Il Nam
Summary: The increasing mercury isotope ratios in lake sediment cores from pre-industrial to present-day are suggested to be a global phenomenon. It is mainly attributed to the increased contribution of mercury from local to regional anthropogenic sources. The magnitude of mercury isotope changes are more influenced by baseline mercury isotope ratios rather than the level of THg input.
GLOBAL BIOGEOCHEMICAL CYCLES
(2021)
Article
Engineering, Environmental
Ruoyu Sun, Holger Hintelmann, Johan A. Wiklund, Marlene S. Evans, Derek Muir, Jane L. Kirk
Summary: This study measured mercury isotope compositions in sediment cores to investigate the relationship between mercury emission sources and deposition in lakes. The results show the significant influence of legacy mercury remobilization on mercury transport in ecosystems.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
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)