Article
Geochemistry & Geophysics
Domokos Gyore, Magali Pujol, Stuart M. V. Gilfillan, Finlay M. Stuart
Summary: Unconventional hydrocarbon resources, such as shale oil/gas and coal-bed methane, have become increasingly important over the past decade. The Vaca Muerta Shale in Argentina contains a significant amount of shale gas, but its exploitation is complicated by elevated CO2 concentrations. Isotopic analysis of CO2-rich gases in the region suggests that CO2 may have originated from magmatic activity and mixing with crustal hydrocarbon-rich gases. Additionally, gases below the shale show evidence of mixing with groundwater-derived noble gases prior to entering the shale formation.
Article
Physics, Atomic, Molecular & Chemical
Alan M. Seltzer, David Bekaert
Summary: We describe a new method for the purification, transfer, and analysis of heavy noble gas isotope ratios in water, air, or volcanic gas samples using a dynamic dual-inlet isotope-ratio mass spectrometer (IRMS). This method allows for highly accurate and precise measurements of Ar, Kr, and Xe isotope ratios via IRMS, independent of sample composition, thereby opening the door to air, water, or volcanic gas analyses all made with the same technique.
INTERNATIONAL JOURNAL OF MASS SPECTROMETRY
(2022)
Article
Geosciences, Multidisciplinary
W. -L. Hong, T. Pape, C. Schmidt, H. Yao, K. Wallmann, A. Plaza-Faverola, J. W. B. Rae, A. Lepland, S. Bunz, G. Bohrmann
Summary: The seafloor seepage sites along the Vestnesa Ridge off west-Svalbard have been a natural laboratory for studying fluid flow and gas hydrate dynamics. The research conducted in 2016 revealed unique characteristics of gas hydrates, hinting at temperature modification at great depths. Analysis of pore fluid composition also showed the presence of high chloride concentrations, high B/Cl ratios, and isotopic signatures indicating methane supply and decomposition dynamics.
MARINE AND PETROLEUM GEOLOGY
(2021)
Article
Geochemistry & Geophysics
Alan M. Seltzer, John A. Krantz, Jessica Ng, Wesley R. Danskin, David V. Bekaert, Peter H. Barry, David L. Kimbrough, Justin T. Kulongoski, Jeffrey P. Severinghaus
Summary: Understanding the age and movement of groundwater is crucial for predicting well vulnerability to contamination, informing groundwater management models, and interpreting past climate signals. Improvements in geochemical dating tools for Late Pleistocene groundwater are necessary due to the importance of groundwater in climate reconstruction. Radiogenic Ar-40, acquired from decay of 40K in aquifer minerals, could serve as a useful complementary tracer for groundwater age, but its detection in significant amounts has been limited. High-precision triple Ar isotope measurements may offer a new tool for interpreting constraints on groundwater age and flow, particularly in Late Pleistocene groundwater studies.
Article
Geochemistry & Geophysics
Sarah S. Zeichner, Laura Chimiak, Jamie E. Elsila, Alex L. Sessions, Jason P. Dworkin, Jose C. Aponte, John M. Eiler
Summary: The Murchison meteorite is a carbonaceous chondrite with high concentrations of amino acids. Previous studies proposed different formation mechanisms for the extraterrestrial amino acids, including Strecker synthesis, Michael addition, and reductive amination. Carbon isotope analysis of specific molecular sites reveals that the amino acids in Murchison were formed from different synthesis mechanisms, highlighting the complexity of extraterrestrial organic synthesis networks.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2023)
Article
Geochemistry & Geophysics
Justin A. Hayles, Bryan A. Killingsworth
Summary: The study found that some kinetic isotope effects result in large isotopic variations, while other kinetic isotope effects exhibit relationships similar to equilibrium isotope effects.
Article
Geochemistry & Geophysics
Timothy Csernica, John M. Eiler
Summary: Molecules exist in different forms, called isotopologues, with varying numbers of isotopic substitutions. The concentration of these isotopologues in a sample, known as the isotome, encodes information about the sample's history. Recent advances enable the measurement of constraints on the sample's isotome, but there is a challenge in relating these constraints to the abundances of all possible isotopologues. In this study, a mathematical framework is developed to understand the relationship between different measurements of a sample's isotome.
Article
Chemistry, Analytical
Katerina Rodiouchkina, Ilia Rodushkin, Steven Goderis, Frank Vanhaecke
Summary: Sulfur isotope ratios are commonly used as tracers to study sulfur cycle processes in modern and ancient environments. However, there is a lack of well-characterized isotopic reference materials. This study aimed to provide a comprehensive set of sulfur isotope ratio data for various commercially available biological and geological reference materials. Different sample preparation protocols were evaluated, and the measurements were done at multiple laboratories using multi-collector inductively coupled plasma-mass spectrometry. The results showed good agreement between laboratories and instrumental generations, and the determined delta S-34 and delta S-33 values were consistent with literature values.
ANALYTICA CHIMICA ACTA
(2023)
Article
Plant Sciences
Cyril Abadie, Julie Lalande, Guillaume Tcherkez
Summary: Plant metabolomics is widely used in plant physiology to study metabolic responses to environmental parameters. Derivatization followed by GC-MS metabolic profiling is a major technique for quantifying primary carbon, sulphur, and nitrogen metabolites. However, routine exact mass GC-MS analyses are not common due to the lack of dedicated databases. In this study, a curated database for exact mass metabolomics focused on primary metabolism was presented. The advantages of exact mass analyses were demonstrated, including resolving isotopic patterns, localizing S-containing metabolites, and avoiding identification errors. A practical example using Arabidopsis leaves showcased how exact mass GC-MS analysis can be used for plant samples and identify metabolic profiles.
PLANT CELL AND ENVIRONMENT
(2022)
Article
Geochemistry & Geophysics
Rui Liu, Tao Wen, Julien Amalberti, Jian Zheng, Fang Hao, Dingchuan Jiang
Summary: This study presents measurements of bulk gas composition, stable isotopes, and noble gas volume fraction and isotopes for shale samples collected from gas wells in the Wufeng-Longmaxi Shale, China. The results suggest a late mature thermogenic origin of hydrocarbon gas with a mixing of crustal and atmospheric noble gases. Forelimb samples generally display older ages than backlimb samples, indicating a larger flux of external radiogenic He-4 due to higher density of deep faults.
Article
Geochemistry & Geophysics
R. Karolyte, P. H. Barry, A. G. Hunt, J. T. Kulongoski, R. L. Tyne, T. A. Davis, M. T. Wright, P. B. McMahon, C. J. Ballentine
Summary: Using noble gas signatures can trace the seepage of oil-field water into groundwater aquifers, differentiate between thermogenic and microbial hydrocarbon gas sources, and distinguish leakage sources.
Article
Environmental Sciences
Hung T. T. Nguyen, Stefano Galelli, Chenxi Xu, Brendan M. Buckley
Summary: This study presents a novel framework that optimizes proxy combinations to simultaneously produce seasonal and annual reconstructions, ensuring a close match between seasonal and annual flow. By applying this framework in Southeast Asia, the study successfully reconstructs seasonal and annual inflow to Thailand's largest reservoir with good preservation of mass balance.
WATER RESOURCES RESEARCH
(2021)
Article
Chemistry, Analytical
Ying Zhang, Bei Gao, Luis Valdiviez, Chao Zhu, Tara Gallagher, Katrine Whiteson, Oliver Fiehn
Summary: Stable isotope tracers are commonly used with gas chromatography coupled to mass spectrometry for enzyme activity and metabolic pathway studies. In this research, three commercially available instruments were used to analyze samples from a stable isotope labeling study on Rothia mucilaginosa metabolism. The study found that all three GC-MS instruments can be used for stable isotope tracing studies, with high-resolution GC-QTOF MS offering additional capabilities in identifying the chemical structures of unknown compounds.
ANALYTICAL CHEMISTRY
(2021)
Article
Geochemistry & Geophysics
Gabriella B. Kiss, Kata Molnar, Zsolt Benko, Peter Skoda, Zsuzsanna Kapui, Giorgio Garuti, Federica Zaccarini, Laszlo Palcsu, Gyorgy Czuppon
Summary: The Italian Northern Apennines are rich in Fe-Cu-Zn-bearing, Cyprus-type volcanogenic massive sulfide (VMS) deposits, which contribute significantly to Italy's copper resources. Fluid inclusion microthermometry, Raman spectroscopy, electron probe analyses, and stable and noble gas isotope geochemistry were used to determine the fluid source of the VMS system in this region. The findings indicate an evolved seawater origin for the mineralizing fluid, with modification occurring through fluid-rock interaction processes during long-lasting circulation in the crust.
Article
Geosciences, Multidisciplinary
Ziqi Feng, Fang Hao, Jinqiang Tian, Shangwen Zhou, Dazhong Dong, Shipeng Huang
Summary: This review systematically analyzes the geochemical characteristics of Silurian shale gas in the Sichuan Basin, including its special isotope anomalies. The dominant component of over-mature Longmaxi Formation shale gas is methane, with high CH4 and low C2+ contents. The geochemical anomalies mainly refer to abnormally enriched delta C-13(1) values and full reversal, resulting in deviations in carbon isotope composition and light hydrocarbon data. Understanding the geological processes that led to these anomalies provides valuable insights for studying late-stage gas generation.
EARTH-SCIENCE REVIEWS
(2022)
Article
Geochemistry & Geophysics
Mark A. Kendrick, Masahiko Honda, David A. Vanko
CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
(2015)
Article
Physics, Atomic, Molecular & Chemical
Masahiko Honda, Xiaodong Zhang, David Phillips, Doug Hamilton, Michael Deerberg, Johannes B. Schwieters
INTERNATIONAL JOURNAL OF MASS SPECTROMETRY
(2015)
Article
Geochemistry & Geophysics
D. Phillips, E. L. Matchan, M. Honda, K. F. Kuiper
GEOCHIMICA ET COSMOCHIMICA ACTA
(2017)
Article
Geochemistry & Geophysics
Erin L. Matchan, Masahiko Honda, Timothy T. Barrows, David Phillips, Allan R. Chivas, L. Keith Fifield, Derek Fabel
GEOCHIMICA ET COSMOCHIMICA ACTA
(2018)
Article
Geosciences, Multidisciplinary
Venera R. May, Allan R. Chivas, Anthony Dosseto, Masahiko Honda, Erin L. Matchan, David Phillips, David M. Price
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
(2018)
Article
Geochemistry & Geophysics
Suzette Timmerman, Masahiko Honda, David Phillips, Alan L. Jaques, Jeffrey W. Harris
MINERALOGY AND PETROLOGY
(2018)
Article
Geochemistry & Geophysics
Mark A. Kendrick, Masahiko Honda, Thomas Pettke, Marco Scambelluri, David Phillips, Andrea Giuliani
EARTH AND PLANETARY SCIENCE LETTERS
(2013)
Article
Geochemistry & Geophysics
Mark A. Kendrick, Richard J. Arculus, Leonid V. Danyushevsky, Vadim S. Kamenetsky, Jon D. Woodhead, Masahiko Honda
EARTH AND PLANETARY SCIENCE LETTERS
(2014)
Article
Geography, Physical
Venera R. Espanon, Masahiko Honda, Allan R. Chivas
QUATERNARY GEOCHRONOLOGY
(2014)
Article
Geochemistry & Geophysics
Suzette Timmerman, Hanling Yeow, Masahiko Honda, Daniel Howell, A. Lynton Jaques, Mandy Y. Krebs, Sarah Woodland, D. Graham Pearson, Janaina N. Avila, Trevor R. Ireland
Article
Geochemistry & Geophysics
S. Timmerman, M. Y. Krebs, D. G. Pearson, M. Honda
GEOCHIMICA ET COSMOCHIMICA ACTA
(2019)
Article
Multidisciplinary Sciences
S. Timmerman, M. Honda, A. D. Burnham, Y. Amelin, S. Woodland, D. G. Pearson, A. L. Jaques, C. Le Losq, V. C. Bennett, G. P. Bulanova, C. B. Smith, J. W. Harris, E. Tohver
Article
Geochemistry & Geophysics
Ying-Chao Liu, Mark A. Kendrick, Zeng-Qian Hou, Zhu-Sen Yang, Shi-Hong Tian, Yu-Cai Song, Masahiko Honda
Article
Geochemistry & Geophysics
Xiaodong Zhang, Masahiko Honda
