Article
Geochemistry & Geophysics
Long Li, Pierre Cartigny, Kan Li
Summary: Experimental results show that roaldite can be formed under different temperature conditions, with equilibrium nitrogen isotope fractionations observed at specific temperatures, but decomposition occurs at high temperatures. Caution is needed when using nitride minerals like roaldite to trace source information.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2021)
Article
Physics, Multidisciplinary
N. L. Figueroa, J. C. Berengut, V. A. Dzuba, V. V. Flambaum, D. Budker, D. Antypas
Summary: Measurements of isotope shifts for Yb isotopes and Yb+ transitions, combined with existing data, show reduced significance of new-physics signal. The observed nonlinearity in the joint Yb/Yb+ King-plot analysis can be explained by the deformation of Yb nuclei.
PHYSICAL REVIEW LETTERS
(2022)
Article
Engineering, Environmental
Ruizhi Xia, Jun Zhou, Zhen Zeng, Yufang Sun, Hongbiao Cui, Hailong Liu, Jing Zhou
Summary: By using the Bayesian mixing model, this study investigated the fractionation of Cd uptake and transport in rice plants exposed to Cd-contaminated particles. The results showed that heavy isotopes were released from the particles, while light isotopes were preferentially retained in the roots and leaves. The isotope mixing and mass balance models suggested that a significant portion of Cd deposition occurred on the grains. This study provides a theoretical basis for tracing the source of Cd isotopes in plants.
ENVIRONMENTAL SCIENCE & TECHNOLOGY LETTERS
(2023)
Article
Geochemistry & Geophysics
Andrew C. Turner, Nicholas J. Pester, Markus Bill, Mark E. Conrad, Kevin G. Knauss
Summary: The hydrogen isotopic composition of methane can serve as an indicator of gas origins. This study presents experimental constraints on the kinetics of hydrogen isotope exchange between methane and supercritical water, showing that exchange rates vary with temperature and suggesting the influence of life activity and thermogenic natural gas systems. The findings have implications for understanding the signatures of methane and water on Earth and other planetary bodies.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Geochemistry & Geophysics
Daniel L. Eldridge, Andrew C. Turner, Markus Bill, Mark E. Conrad, Daniel A. Stolper
Summary: Methane clumped isotope compositions are used as a new isotopic tool to trace the sources, sinks, and lifecycles of methane in the environment. Natural thermogenic methane can have clumped isotope compositions consistent with equilibrium or non-equilibrium processes. Isothermal time-series ethane pyrolysis experiments were conducted to explore the controls on the isotopic composition of thermogenic methane.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2023)
Article
Geochemistry & Geophysics
Clancy Zhijian Jiang, Itay Halevy, Nicholas J. Tosca
Summary: The presence of siderite in sedimentary rocks is widely used for palaeoenvironmental reconstruction. Isotopic studies have shown negative delta C-13 values in siderite associated with banded iron formations, suggesting the involvement of dissimilatory iron reduction in their formation. Further analysis indicates that the range of siderite delta C-13 values can be explained by various processes, including precipitation from dissolved inorganic carbon, hydrothermal-seawater fluid, or seawater-derived DIC with a kinetic isotope effect.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Energy & Fuels
Zhengru Yang, Mohammadebrahim Shabani, Nisael Solano, Amin Ghanizadeh, Christopher R. Clarkson
Summary: Relative permeability controls fluid flow through rocks, with applications to hydrocarbon production, geologic carbon and energy storage. However, significant challenges are associated with the measurement of relative permeability for rocks with matrix permeability in the microdarcy to nanodarcy range. This study proposes an integrated experimental and modeling approach for gas relative permeability evaluation using crushed-rock samples and demonstrates the feasibility of determining gas-liquid relative permeability for ultra-low-permeability reservoir samples.
Review
Biotechnology & Applied Microbiology
Peng Li, Wencan Zhang, Feng Hu, Jianfeng Ye, Zuxin Xu
Summary: Due to pollution discharge and climate change, hypoxia is becoming more prevalent in water bodies such as lakes, rivers, and oceans. In this paper, the physical characteristics and detection methods of mackinawite were used to determine how to detect it in hypoxic water bodies. The population and metabolism of key microorganisms during mackinawite generation were analyzed, and the existing patterns of mackinawite during the blackening process of hypoxic waters were illustrated.
REVIEWS IN ENVIRONMENTAL SCIENCE AND BIO-TECHNOLOGY
(2022)
Article
Environmental Sciences
Lu Yu, Tianyuan Zheng, Yujie Hao, Xilai Zheng
Summary: This study conducted incubation experiments for the first time to quantitatively investigate the nitrogen isotope enrichment factor associated with ammonification in unsaturated soil, proposing a different calculation method for the epsilon(p/s) values during ammonification. Experimental results indicated that the isotope effect of volatilization during nitrification can be ignored. This work provides a novel approach for identifying crucial parameters for determining nitrate pollution sources in groundwater systems.
ENVIRONMENTAL RESEARCH
(2021)
Article
Engineering, Geological
Fuxin Rui, Gao-Feng Zhao
Summary: The study aims to develop a numerical tool for quantitative investigation of laser-induced rock damage, demonstrating that the multiparameter damage model is more suitable for numerical simulation in this field through experimental tests and model establishment.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2021)
Article
Geochemistry & Geophysics
Jianghong Deng, Yongsheng He, Robert E. Zartman, Xiaoyong Yang, Weidong Sun
Summary: Mantle wedge serpentinites play a crucial role in the oxidation process of arc magmas, and a mechanism involving iron isotope fractionation and iron oxidation has been proposed to explain this phenomenon.
EARTH AND PLANETARY SCIENCE LETTERS
(2022)
Article
Engineering, Environmental
Bosong Yu, Kai Zhang, Ganggang Niu, Xinran Xue
Summary: The application scope and stability of the rock drillability index are better than the drilling specific energy in real-time assessment of rock strength.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2021)
Article
Engineering, Mechanical
Fabian J. Antinao Fuentealba, Leandro N. Bianchi, Jose L. Otegui, Gustavo L. Bianchi
Summary: This article discusses the use of linear elastic fracture mechanics to assess the critical stress intensity factor (KIC) of shale rocks under confining pressure. Experimental assessment and finite element modeling were used to validate the results and understand the effects of confinement on fracture toughness.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2022)
Article
Geosciences, Multidisciplinary
Bo Jiu, Wenhui Huang, Nana Mu, Ruilin Hao
Summary: Paleokarst carbonate reservoirs play a crucial role in oil and gas exploration, and the study of ultra-deep karst-hydrothermal reformed carbonate reservoirs in the Yubei area provides insights into the paleokarst periods, chemical properties of hydrothermal fluids, and the formation mechanism of these reservoirs.
MARINE AND PETROLEUM GEOLOGY
(2022)
Article
Biochemistry & Molecular Biology
Marta Malo, Igor Penalva, Jon Azkurreta, Belit Garcinuno, Hao-Dong Liu, David Rapisarda, Hai-Shan Zhou, Guang-Nan Luo
Summary: This study experimentally investigated the permeation of deuterium through vanadium membranes in a wide range of pressures and a temperature range of 250-550 degrees Celsius. The same material was tested in three different laboratories to obtain a unified equation for deuterium permeability in pure vanadium. Adsorption and recombination rate constants were also measured. The influence of surface roughness on deuterium permeation was examined.
Article
Chemistry, Multidisciplinary
Eyal Wurgaft, Alyssa J. Findlay, Hanni Vigderovich, Barak Herut, Orit Sivan
Review
Microbiology
Bo Barker Jorgensen, Alyssa J. Findlay, Andre Pellerin
FRONTIERS IN MICROBIOLOGY
(2019)
Article
Geology
Alyssa J. Findlay, Valeria Boyko, Andre Pellerin, Khoren Ayetisyan, Qingjun Guo, Xi Yang, Alexey Kamyshny
Correction
Environmental Sciences
Khoren Avetisyan, Werner Eckert, Alyssa J. Findlay, Alexey Kamyshny
Article
Geochemistry & Geophysics
Alexander B. Michaud, Katja Laufer, Alyssa Findlay, Andre Pellerin, Gilad Antler, Alexandra Turchyn, Hans Roy, Laura M. Wehrmann, Bo Barker Jorgensen
GEOCHIMICA ET COSMOCHIMICA ACTA
(2020)
Article
Geosciences, Multidisciplinary
Amy Gartman, Alyssa J. Findlay
Article
Geochemistry & Geophysics
Alyssa J. Findlay, Andre Pellerin, Katja Laufer, Bo Barker Jorgensen
GEOCHIMICA ET COSMOCHIMICA ACTA
(2020)
Correction
Geosciences, Multidisciplinary
Amy Gartman, Alyssa J. Findlay
Article
Geochemistry & Geophysics
Jiarui Liu, Andre Pellerin, Gilad Antler, Sabine Kasten, Alyssa J. Findlay, Ingrid Dohrmann, Hans Roy, Alexandra V. Turchyn, Bo Barker Jorgensen
GEOCHIMICA ET COSMOCHIMICA ACTA
(2020)
Article
Geochemistry & Geophysics
Valeria Boyko, Khoren Avetisyan, Alyssa Findlay, Qingjun Guo, Xi Yang, Andre Pellerin, Alexey Kamyshny
Summary: The research investigates the cycling of redox-sensitive elements in a seasonally stratified lake in China and suggests that the biogeochemical cycles in the lake may be analogous to those in the Archean ocean. The study found that the lake's hypolimnion becomes anoxic and contains iron, manganese, and low concentrations of hydrogen sulfide, similar to conditions suggested in the ancient ocean.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2021)
Article
Biotechnology & Applied Microbiology
Moein J. Veshareh, Kasper U. Kjeldsen, Alyssa J. Findlay, Hamidreza M. Nick, Hans Roy, Angeliki Marietou
Summary: Microbial sulfate reduction is the main source of hydrogen sulfide in offshore oil reservoirs, with nitrate, nitrite, and perchlorate being potential inhibitors. Nitrate inhibits sulfide accumulation by promoting sulfate reduction and sulfide oxidation, while nitrite is the most efficient inhibitor. Further field scale studies are needed to confirm the effectiveness of perchlorate as a souring mitigation agent.
INTERNATIONAL BIODETERIORATION & BIODEGRADATION
(2021)
Article
Geology
Jiarui Liu, Gilad Antler, Andre Pellerin, Gareth Izon, Ingrid Dohrmann, Alyssa J. Findlay, Hans Roy, Shuhei Ono, Alexandra Turchyn, Sabine Kasten, Bo Barker Jorgensen
Summary: Sedimentary pyrite formation is closely linked to the global biogeochemical cycles of carbon, sulfur, and iron, with the sulfur isotopic composition of pyrite widely used as a geochemical tool to investigate the evolution of ocean chemistry. However, characteristics of the depositional environment and post-depositional processes can alter the sulfur isotopic signal captured in sedimentary pyrite. This study in the Bornholm Basin, Baltic Sea, demonstrates the critical role of reactive iron in pyrite formation and raises questions about the accuracy of pyrite delta 34S values in reflecting past global ocean chemistry and biogeochemical processes. The research also shows an increase in pyrite formation at the sediment-water interface over the past few centuries in response to expanding water-column hypoxia.
Editorial Material
Environmental Sciences
Alyssa Findlay, Bronwyn Wake
NATURE CLIMATE CHANGE
(2021)
Article
Geochemistry & Geophysics
Jiarui Liu, Andre Pellerin, Gilad Antler, Gareth Izon, Alyssa J. Findlay, Hans Roy, Shuhei Ono, Sabine Kasten, Alexandra Turchyn, Bo Barker Jorgensen
Summary: The study of sulfur cycling in marine sediments is crucial for understanding Earth's surface chemistry. Research in the Bornholm Basin reveals the influence of the thickness of the organic carbon-rich Holocene Mud Layer on sulfur dynamics. Results indicate a close relationship between sulfur isotope composition and sulfate reduction rates, with porewater profiles playing a key role in providing insights into sulfur cycling.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2021)
Article
Chemistry, Multidisciplinary
Emily R. Estes, Debora Berti, Alyssa J. Findlay, Michael F. Hochella, Timothy J. Shaw, Mustafa Yucel, Eric H. De Carlo, George W. Luther
Summary: Extensive sampling at the East Pacific Rise hydrothermal vent field showed that mixing of vent fluid with seawater results in the formation of nanoparticulate phases and the rapid precipitation/aggregation of metal sulfide minerals. Iron speciation and transport is decoupled from that of copper and zinc. Zinc and copper sulfide phases form nano-sized particles that can be easily removed by filtration, while iron sulfides exist as larger particles. Formation of pyrite nanoparticles is influenced by physical mixing and temperature. pH and zero point of charge of metal sulfides control particle formation and aggregation. Trace metal concentrations vary between vent sites, highlighting the importance of diffuse flow systems in hydrothermal metal emissions. The behavioral differences near the vents have implications for long-distance transport of metals.
ACS EARTH AND SPACE CHEMISTRY
(2022)
Article
Geochemistry & Geophysics
Xinze Lu, Geoffrey J. Gilleaudeau, Brian Kendall
Summary: The Late Ordovician mass extinction is the first major extinction event in the Phanerozoic, but the reasons for the decline in global biodiversity before the extinction are not well understood.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2024)
Article
Geochemistry & Geophysics
Junyao Kang, Daniel D. Gregory, Benjamin Gill, Shiqiang Huang, Changxin Lai, Zhaoshan Chang, Huan Cui, Ivan Belousov, Shuhai Xiao
Summary: Sedimentary pyrite is an important geological archive, but it can be altered by diagenetic and hydrothermal processes. This study successfully trained machine learning algorithms to distinguish pyrite origins using trace element data. The approach was validated and applied to identify the origins of pyrite in two sedimentary successions in South China.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2024)