Article
Geochemistry & Geophysics
Zhendong Tian, Bernd Lehmann, Changzhou Deng, Anbo Luo, Xingchun Zhang, Frederic Moynier, Runsheng Yin
Summary: This study reports the Hg isotopic compositions of granitic rocks and metasedimentary enclaves from the South China Craton. The results show different isotopic compositions for different types of granites, suggesting significant isotopic fractionation during magmatic processes. By combining with previously published data, the Hg abundance and isotopic composition of the upper continental crust are estimated to be higher than that of the primitive mantle.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2023)
Article
Environmental Sciences
Jingjing Yuan, Ruoyu Sun, Ruwei Wang, Biao Fu, Mei Meng, Wang Zheng, Jiubin Chen
Summary: The study reveals that modern coal-fired boilers with denitrification devices exhibit different Hg isotope fractionation effects compared to traditional boilers without denitrification devices. Significant enrichment of heavy Hg isotopes in combustion products was observed, which increased with sequential removal of combustion products.
ENVIRONMENTAL POLLUTION
(2021)
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
Geology
Qingfei Wang, Xuefei Liu, Runsheng Yin, Weijun Weng, Hesen Zhao, Lin Yang, Degao Zhai, Dapeng Li, Yao Ma, David I. Groves, Jun Deng
Summary: This study investigates the mercury isotope ratios of gold-related sulfides and mafic dikes from four orogenic gold provinces on the margins of the North China Craton and Yangtze Craton, revealing the presence of three different orogenic gold deposit (OGD) groups. The analysis indicates that the subduction histories play a major role in determining the sources of the OGDs.
Article
Engineering, Environmental
Biao Fu, Ruoyu Sun, Hong Yao, James C. Hower, Jingjing Yuan, Guangqian Luo, Hongyun Hu, Sarah M. Mardon, Quan Tang
Summary: The study simulated the fractionation of isotopes during Hg-0 adsorption onto fly ash particles. Results indicated that kinetic MDF dominated the Hg-0 adsorption process, with the magnitude of MDF remaining stable in the time-series experiment but significantly increasing with higher temperatures in the temperature-series experiment.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Environmental Sciences
Pedro Brito, Miguel Caetano, Marcelo D. Martins, Isabel Cacador
Summary: The study found that halophyte plants in salt marsh sediments can impact the geochemical fractionation of rare earth elements, especially in the reducible and oxidisable fractionation. REEs in sediments are mainly influenced by carbonates, Fe=Mn oxyhydroxides, and organic matter, with plant activity promoting their bioavailability.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Engineering, Environmental
Xiaoshuai He, William G. Wallace, John R. Reinfelder
Summary: Grass shrimp have been identified as a potential factor in the transfer of methylmercury from salt marsh sediments to young-of-the-year (YOY) fish. The concentrations of methylmercury in grass shrimp were found to be significantly correlated with sediment levels. Bioenergetic models have shown that grass shrimp play a major role in the accumulation of methylmercury in YOY striped bass and summer flounder. Direct accumulation of methylmercury from grass shrimp to YOY fish increases with higher levels of methylmercury in both grass shrimp and sediment. However, in heavily contaminated salt marshes, indirect accumulation of methylmercury from grass shrimp by YOY summer flounder is predicted to plateau due to a lower proportion of grass shrimp in the diet.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Engineering, Environmental
Guangyi Sun, Xinbin Feng, Runsheng Yin, Feiyue Wang, Che-Jen Lin, Kai Li, Jonas Olof Sommar
Summary: The recent discovery of mass-independent fractionation of even-mass mercury isotopes in the atmosphere suggests that UVC-induced photodissociation of mercuric oxides may be responsible for this phenomenon. This finding has significant implications for understanding mercury biogeochemistry.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Geography, Physical
Xiangdong Wang, Peter A. Cawood, Stephen E. Grasby, Laishi Zhao, Zhong-Qiang Chen, Shunling Wu, Huang Yuangeng
Summary: The end Permian mass extinction (EPME) is believed to have been triggered primarily by the Siberian Traps Large Igneous Province (STLIP), resulting in two pulses of Hg enrichments and negative carbon isotopic excursions coinciding with terrestrial and marine extinction events.
GLOBAL AND PLANETARY CHANGE
(2021)
Article
Engineering, Environmental
Lorenz Schwab, Niklas Gallati, Sofie M. Reiter, Richard L. Kimber, Naresh Kumar, David S. McLagan, Harald Biester, Stephan M. Kraemer, Jan G. Wiederhold
Summary: This study contributes significantly to the database of Hg isotope enrichment factors for specific processes. The findings show that Hg(II) reduction by dissolved Fe(II) in open systems results in a kinetic mass-dependent fractionation (MDF) with a larger epsilon compared to other abiotic reduction pathways, and combining MDF with the observed mass-independent fractionation (MIF) allows the distinction from photochemical or microbial Hg(II) reduction pathways.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Biochemistry & Molecular Biology
Jeremy Rott, Eva Teresa Toepfer, Maria Bartosova, Ivan Damgov, Ana Kolevica, Alexander Heuser, Rukshana Shroff, Sotirios G. Zarogiannis, Anton Eisenhauer, Claus Peter Schmitt
Summary: Calcium isotopes (δ44/42Ca) in serum and urine are considered as sensitive markers for bone calcification. However, the response of δ44/42Ca to acute changes in calcium homeostasis remains uncertain. In this study, rats were maintained on different diets and injected with AMG-416, a calcimimetic, to investigate the acute effects on serum calcium and δ44/42Ca. The results showed that AMG-416 significantly decreased serum calcium levels, but there were no acute changes in δ44/42Ca, suggesting a lack of bone calcification within 24 hours after injection.
BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS
(2023)
Article
Geosciences, Multidisciplinary
Dongjie Tang, Xuewu Fu, Xiaoying Shi, Limin Zhou, Wang Zheng, Chao Li, Dongtao Xu, Xiqiang Zhou, Baozeng Xie, Xiyan Zhu, Ganqing Jiang
Summary: This study examines an oxygenation event that occurred around 1.57 billion years ago in the Gaoyuzhuang Formation of North China. The data analysis suggests that the event was likely caused by enhanced weathering of intermediate to mafic rocks, leading to increased phosphorus influx to the ocean and a rise in oxygen levels.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Engineering, Environmental
Deming Han, Qingru Wu, Minneng Wen, Yi Tang, Guoliang Li, Yujia Ren, Yuying Cui, Zhijian Li, Jianbo Shi, Qianggong Zhang, Xiufeng Yin, Shuxiao Wang
Summary: As the Third Pole of the world, the Tibetan Plateau is sensitive to human activities. Biomass combustion is an important source of mercury emissions in the plateau, but due to limited knowledge about emission characteristics and activity levels, uncertainties exist in estimating these emissions.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Construction & Building Technology
Sabina Berisha, Igor Zivkovic, Joze Kotnik, Tanja Ljubic Mlakar, Milena Horvat
Summary: The main purpose of this study was to assess the potential of using temperature-programmed desorption coupled to quadrupole mass spectrometry to study the mercury partitioning in cement production. The results provide insights into the behavior of mercury in the cement production process and can be used to support the development of control technologies.
CEMENT AND CONCRETE RESEARCH
(2022)
Article
Geosciences, Multidisciplinary
Sheron Y. Luk, Katherine Todd-Brown, Meagan Eagle, Ann P. McNichol, Jonathan Sanderman, Kelsey Gosselin, Amanda C. Spivak
Summary: The study highlights the importance of soil organic carbon accumulation and preservation for salt marsh survival under sea-level rise. Different processes, such as marsh grass production, redeposition of old carbon, and microbial reworking, contribute to the development of marsh soil organic carbon. Decomposition decreases the thermal reactivity of soil organic carbon, while disturbances like ponding can accelerate this shift, especially in surface horizons. The turnover rates of geochemically defined soil organic carbon pools, ranging from centuries to millennia, can help refine predictions of salt marsh sustainability.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Environmental Sciences
Kai Xiao, Hailong Li, Dehai Song, Yanyu Chen, Alicia M. Wilson, Meghan Shananan, Gang Li, Yimeng Huang
JOURNAL OF COASTAL RESEARCH
(2019)
Article
Geography, Physical
Marc S. Humphries, Claudia R. Benitez-Nelson, Michael Bizimis, Timothy J. Ralph, Zacchary T. Larkin, Terence S. McCarthy
EARTH SURFACE PROCESSES AND LANDFORMS
(2020)
Editorial Material
Environmental Sciences
Carlos Duque, Holly A. Michael, Alicia M. Wilson
WATER RESOURCES RESEARCH
(2020)
Article
Geosciences, Multidisciplinary
Emily B. Osborne, Natalie E. Umling, Michael Bizimis, Wayne Buckley, Aleksey Sadekov, Eric Tappa, Brittney Marshall, Leslie R. Sautter, Robert C. Thunell
PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY
(2020)
Article
Geochemistry & Geophysics
Lynne J. Elkins, Christine M. Meyzen, Sara Callegaro, Andrea Marzoli, Michael Bizimis
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2020)
Article
Environmental Sciences
Tyler B. Evans, Scott M. White, Alicia M. Wilson
WATER RESOURCES RESEARCH
(2020)
Article
Environmental Sciences
C. A. Schutte, W. S. Moore, A. M. Wilson, S. B. Joye
GLOBAL BIOGEOCHEMICAL CYCLES
(2020)
Article
Limnology
Kai Xiao, Alicia M. Wilson, Hailong Li, Isaac R. Santos, Joseph Tamborski, Erik Smith, Susan Q. Lang, Chunmiao Zheng, Xin Luo, Meiqing Lu, Rogger E. Correa
Summary: Abundant crab burrows in carbon-rich, muddy salt marsh soils act as preferential water flow conduits, potentially enhancing carbon transport across the soil-water interface. Results showed that continuous advective porewater exchange between the crab burrows and the surrounding soil matrix occurs because of tidally driven hydraulic gradients. The estimated total C export rate via porewater exchange was much greater than via passive diffusion transport and gas-phase CO2 release.
LIMNOLOGY AND OCEANOGRAPHY
(2021)
Article
Environmental Sciences
Camaron George, Willard S. Moore, Scott M. White, Erin Smoak, Samantha B. Joye, Andrew Leier, Alicia M. Wilson
WATER RESOURCES RESEARCH
(2020)
Article
Multidisciplinary Sciences
Matthew G. Jackson, Janne Blichert-Toft, Saemundur A. Halldorsson, Andrea Mundl-Petermeier, Michael Bizimis, Mark D. Kurz, Allison A. Price, Sunna Haroardottir, Lori N. Willhite, Kresten Breddam, Thorsten W. Becker, Rebecca A. Fischer
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2020)
Article
Geochemistry & Geophysics
Benjamin L. Byerly, M. G. Jackson, M. Bizimis
Summary: This study reveals the presence of grain-scale isotopic and trace elemental heterogeneities in mantle peridotites, potentially related to trapped fluid and/or melt inclusions. Extreme intra-xenolith isotopic heterogeneity is found in some peridotite xenoliths, while not all xenoliths displaying trace elemental heterogeneity exhibit isotopic heterogeneity. Carbonatitic metasomatism is suggested to be responsible for creating the observed intra-xenolith isotopic heterogeneities.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2021)
Review
Geochemistry & Geophysics
Pei Xin, Alicia Wilson, Chengji Shen, Zhenming Ge, Kevan B. Moffett, Isaac R. Santos, Xiaogang Chen, Xinghua Xu, Yvonne Y. Y. Yau, Willard Moore, Ling Li, D. A. Barry
Summary: Salt marshes are important ecosystems that provide essential ecological services, but they have been lost globally due to human activities and climate change. The interactions between tidal water and groundwater in salt marshes affect plant growth and biogeochemical exchange with coastal water. However, there are still significant knowledge gaps regarding the hydrological and ecological links in salt marshes and the challenges they face.
REVIEWS OF GEOPHYSICS
(2022)
Article
Geosciences, Multidisciplinary
Willard S. Moore, Jacob Vincent, James L. Pickney, Alicia M. Wilson
Summary: This study reveals that submarine groundwater discharge (SGD) can directly affect the dissolved oxygen (DO) content in coastal bottom waters. The researchers developed a prediction model that linked episodes of enhanced SGD to upwelling-favorable winds. The data showed that these water masses had higher Ra-226 and Ra-228 values compared to typical bottom water, and were significantly depleted in DO. The successful prediction using wind data represents a major advancement in quantifying SGD in the region.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geosciences, Multidisciplinary
Scott M. White, Erin Smoak, Andrew L. Leier, Alicia M. Wilson
Summary: This study examined the sediment deposits in a 150 km(2) area of the inner shelf north of Charleston, South Carolina, using high-resolution seismic profiles and sediment cores. The results showed that the paleochannels in this area are often mud-lined or filled, acting as a confining layer for submarine groundwater flow.
Article
Environmental Sciences
Maosheng Yin, Kai Xiao, Pei Xin, Hailong Li, Chunmiao Zheng, Erik Smith, Alicia M. Wilson
Summary: This study investigates the impact of crab burrows on groundwater flow and salt transport in coastal wetlands. The results show that crab burrows can form complex networks of preferential flow paths, enhancing groundwater and salt circulation. The morphology of the burrows also plays a key role in the depth and intensity of burrow flushing.
WATER RESOURCES RESEARCH
(2023)
Article
Geochemistry & Geophysics
Zhen-Min Ge, Xiao-Long Huang, Wei Xie, Tobias W. Hofig, Fan Yang, Yang Yu, S. Khogenkumar Singh
Summary: The mantle source composition of the nascent oceanic crust in the central part of the Gulf of California has been investigated using basaltic glass samples. These samples show trace element patterns similar to enriched mid-ocean ridge basalts, suggesting that the nascent oceanic crust in the Guaymas Basin might be generated through partial melting of a depleted mantle source metasomatized by subducted slab materials.
Article
Geochemistry & Geophysics
Jean-Michel Brazier, Katja E. Goetschl, Martin Dietzel, Vasileios Mavromatis
Summary: This study estimated the distribution coefficient of Zn2+ between calcite/aragonite and reactive fluids and found that the growth rate strongly influences D-Zn(2+) in both minerals. Additionally, a linear correlation was found between D-Zn(2+) and the saturation degree of the reactive fluid.
Article
Geochemistry & Geophysics
Ming Lei, Michele Lustrino, Jifeng Xu, Zhiqiang Kang, Zhengfu Guo, Jianlin Chen
Summary: This study presents a comprehensive geochronological, mineralogical, and geochemical analysis of olivine leucitites in the Maiga area of southern Tibet, suggesting that these rocks originate from a carbonated peridotite mantle source and highlighting the possibility of carbonates being recycled deep into the mantle during continental subduction.
Article
Geochemistry & Geophysics
Yuntao Ye, Xiaomei Wang, Huajian Wang, Haifeng Fan, Zhigang Chen, Qingjun Guo, Ziteng Wang, Chaodong Wu, Donald E. Canfield, Shuichang Zhang
Summary: Phosphorus is an essential element for life and its cycle in the ocean is closely connected with the carbon and oxygen cycles. The study of phosphate oxygen isotopes can provide insights into various reactions related to phosphorus. By analyzing carbonate fluorapatite samples from the Mesoproterozoic Era in North China, it was found that the oxygen isotope values were lower compared to modern samples, indicating a warmer climate during that time period and a potential reason for the scarcity of phosphorite.
Article
Geochemistry & Geophysics
Vincent Busigny, Oanez Lebeau, Didier Jezeduel, Carine Chaduteau, Sean Crowe, Magali Ader
Summary: This study conducted high-precision Mo isotope research on hydrothermal metal sulfides from a porphyry copper deposit in Southwest China and found that different stages of mineralization have distinct Mo isotope compositions, providing valuable insights into the behavior of Mo isotopes in magmatic-hydrothermal systems.
Article
Geochemistry & Geophysics
Min Ji, Xiao-Ying Gao, Yong-Fei Zheng, Bing Gong
Summary: The study examines the anatectic mechanisms in the Himalayan orogen, finding that pressure and temperature control the reaction, while water content mainly affects the solid-phase composition. Dehydration and hydration melting likely occur at different depths in the crust. This research provides important insights into the melting processes in collisional orogens.