Article
Geography, Physical
Yitian Yin, Laiming Zhang, Xue Gu, Runsheng Yin, Yixiong Wen, Tianjie Jin, Chengshan Wang
Summary: This study reveals that the uppermost Cretaceous-lowermost Paleogene strata in the low-latitude Nanxiong Basin exhibit an extremely high mean annual terrestrial temperature, which may be attributed to the Deccan Traps volcanism and the extremely hot and arid regional climate.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2023)
Article
Geochemistry & Geophysics
Sarah A. Katz, Naomi E. Levin, Donald T. Rodbell, David P. Gillikin, Phoebe G. Aron, Benjamin H. Passey, Pedro M. Tapia, Analucia R. Serrepe, Mark B. Abbott
Summary: Oxygen isotope distributions in lacustrine carbonates can be used to understand climate and hydrological change. A combination of clumped (Delta 47) and triple oxygen isotope (Delta iota 17O) measurements can help identify the influences of temperature, evaporation, and precipitation on lacustrine carbonate delta 18O values. The modern calibration of this approach needs to be expanded to different climatic and hydrologic conditions for paleoclimate reconstructions.
EARTH AND PLANETARY SCIENCE LETTERS
(2023)
Article
Geosciences, Multidisciplinary
Ashly B. Padgett, Ethan G. Hyland, Christopher K. West, Landon K. Burgener, David R. Greenwood, James F. Basinger
Summary: Ancient greenhouse periods are important for predicting anthropogenic climate change, but a lack of data from polar regions hampers our understanding of polar climate responses. This study analyzes sediment deposits from Ellesmere and Axel Heiberg Islands in the Canadian Arctic and provides new insights into paleoclimate and burial conditions.
PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY
(2023)
Editorial Material
Geosciences, Multidisciplinary
Marina B. Suarez
Summary: In a recent study, scientists investigated the temperatures of past and future greenhouse Earth by analyzing continental carbonates deposited during known greenhouse climates. This research provides valuable insights into the temperature variations in ancient climates and their implications for the future.
PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY
(2023)
Article
Geography, Physical
H. L. Bricker, J. B. Bateman, B. Elliott, B. A. Mitsunaga, J. Mering, I. S. Foster, Y. Yanes, E. A. Oches, R. A. Eagle, A. Tripati
Summary: This study reconstructs temperature and body water composition of terrestrial snails using carbonate clumped isotope values and oxygen isotope composition of their shells, providing insights into regional and sub-regional paleoclimates and paleoecosystems. The study finds different growth patterns in snail shells from different geographical regions, and the δ O-18 (body water) values in snail shells are enriched relative to the δ O-18 (precipitation) values.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2023)
Editorial Material
Geosciences, Multidisciplinary
Felipe Farias, Peter Szatmari, Anelize Bahniuk, Almerio Barros Franca
Summary: Pietzsch's comments on the research by Farias et al. (2019) highlighted the importance of clumped isotopes and strontium isotopic ratios, agreeing with other possible interpretations while pointing out errors in the geochemical model and proposing a new interpretation.
MARINE AND PETROLEUM GEOLOGY
(2021)
Article
Geochemistry & Geophysics
James M. Watkins, Laurent S. Devriendt
Summary: The disequilibrium between Earth surface carbonates and the surrounding solution complicates the use of stable isotopes in paleoenvironment reconstructions. A box model is developed to describe the isotopic effects in the CaCO3-DIC-H2O system and is validated using experimental data. The model can be applied to various situations involving CO2 absorption, degassing, and mixing with other dissolved inorganic carbon sources.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2022)
Article
Geochemistry & Geophysics
Eva L. Scheller, Miquela Ingalls, John M. Eiler, John P. Grotzinger, Uri Ryb
Summary: Through heating experiments of MHC, the researchers found that the stable isotopic compositions of ikaite pseudomorphs can be used for paleoclimate reconstruction, providing information about water temperature, δ18O(CARB), δ18O(fluid), and δ13C(CARB) which are influenced by dehydration diagenetic effects.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2023)
Article
Geochemistry & Geophysics
Megan E. Smith, Evan W. Moore, Peter K. Swart
Summary: By utilizing different geochemical proxies, this study provides insights into the types of diagenetic alteration that have influenced shallow-water carbonate sediments, allowing for more accurate interpretations of ancient sedimentary records.
Article
Geochemistry & Geophysics
Christoph Spoetl, Yuri Dublyansky, Gabriella Koltai, Charlotte Honiat, Lukas Plan, Thomas Angerer
Summary: This study demonstrates that geochemical analysis of cave wall rock samples can identify hypogene karstification and provide further insights into the temperature and provenance of paleowater, as well as the source of its dissolved inorganic carbon.
Article
Geochemistry & Geophysics
Alvaro Fernandez, Christoph Korte, Clemens Ullmann, Nathan Looser, Stephan Wohlwend, Stefano M. Bernasconi
Summary: The magnitude of temperature changes in the Early Jurassic remains unclear, but clumped isotope measurements may provide better constraints. Experimental results show that partially reordered samples can preserve the majority of the signal even after long-term burial at high temperatures, demonstrating good fidelity in recording temperature changes.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2021)
Article
Geography, Physical
Kseniya Mikhailova, Mikhail Rogov, Victoria Ershova, Oleg Vereshchagin, Olga Shurekova, Anna Feodorova, Victor Zakharov
Summary: This study describes glendonites of Middle-Late Jurassic to Early Cretaceous age from the Barents Shelf, including the first discovery of Late Barremian-Early Aptian age glendonites. The detailed mineralogical-geochemical and isotopic studies revealed differences in composition between different types of calcite in the pseudomorphs.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2021)
Article
Geochemistry & Geophysics
Ella A. Holme, Gregory A. Henkes, Nicholas J. Tosca, E. Troy Rasbury, Jordan M. Young, D. R. Schaub, Hanna Nekvasil, Joel A. Hurowitz
Summary: We conducted chemostatic siderite precipitation experiments using a modified constant composition method at temperatures ranging from 15 to 75 degrees C. Our results indicate a composite low temperature relationship for siderite clumped isotope ratios (D47) and its dependence on temperature, which differs from other carbonate minerals in terms of intercept but not slope.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2023)
Article
Geochemistry & Geophysics
A. J. Davies, W. Guo, M. Bernecker, M. Tagliavento, J. Raddatz, E. Gischler, S. Floegel, J. Fiebig
Summary: Dual clumped isotope thermometry of coral carbonate can accurately reconstruct paleotemperatures and may require different corrections for cold-water and warm-water corals.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Geochemistry & Geophysics
Josue J. Jautzy, Peter M. J. Douglas, Hao Xie, John M. Eiler, Ian D. Clark
Summary: The study presents isotopic data of methane from Paleozoic-aged pore waters in an aquiclude system from the Michigan Basin, indicating internal isotopic equilibrium of methane and intermolecular H-isotopic equilibrium between methane and co-occurring non-gaseous n-alkanes. Various mixing and microbial metabolic models were tested to identify the possibility of methane production at thermodynamic equilibrium from the syntrophic degradation of sedimentary n-alkanes at ultra-slow rates. This research sheds light on the deep subsurface biogeochemistry and the potential of using clumped isotopes as a geothermometer.
EARTH AND PLANETARY SCIENCE LETTERS
(2021)
Article
Geology
William E. Lukens, David L. Fox, Kathryn E. Snell, Logan A. Wiest, Anthony L. Layzell, Kevin T. Uno, Pratigya J. Polissar, Robert A. Martin, Kena Fox-dobbs, Pablo Pelaez-campomanes
JOURNAL OF SEDIMENTARY RESEARCH
(2019)
Article
Geosciences, Multidisciplinary
Russell V. Di Fiori, Sean P. Long, Anne C. Fetrow, Kathryn E. Snell, Joshua W. Bonde, Jeff Vervoort
Article
Biology
Miquela Ingalls, Carie M. Frantz, Kathryn E. Snell, Elizabeth J. Trower
Article
Biochemical Research Methods
Rachel E. Havranek, Kathryn E. Snell, Brett Davidheiser-Kroll, Gabriel J. Bowen, Bruce Vaughn
RAPID COMMUNICATIONS IN MASS SPECTROMETRY
(2020)
Article
Geochemistry & Geophysics
Lina C. Perez-Angel, Julio Sepulveda, Peter Molnar, Camilo Montes, Balaji Rajagopalan, Kathryn Snell, Catalina Gonzalez-Arango, Nadia Dildar
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2020)
Article
Geosciences, Multidisciplinary
Miquela Ingalls, Kathryn E. Snell
Summary: Carbonates are prevalent in the geological record and offer stable isotope-based proxies for ancient climatic conditions and environmental histories. A hierarchical suite of techniques is proposed to comprehensively assess alterations in carbonates and identify preserved textures containing valuable environmental information. These techniques include optical and cathodoluminescence microscopy, secondary ionization mass spectrometry (SIMS), PIC mapping, and other technologies for distinguishing primary and altered fabric at finer spatial resolutions.
FRONTIERS IN EARTH SCIENCE
(2021)
Article
Geochemistry & Geophysics
Russell V. Di Fiori, Sean P. Long, Anne C. Fetrow, Kathryn E. Snell, Joshua W. Bonde, Jeff D. Vervoort
Summary: Documenting the deformation within fold-thrust belts is crucial for understanding orogen dynamics. Through geologic mapping and U-Pb zircon geochronology of the Cretaceous Newark Canyon Formation in central Nevada, this study revealed the spatio-temporal progression of deformation processes in the region, including thrusting/folding, east-vergent thrust fault motion, and post-dated east-vergent folding. These findings contribute to a better understanding of the long-duration strain partitioning between the foreland and hinterland in the Sevier hinterland during coupling above the basal decollement.
Article
Geology
Miquela Ingalls, Anne C. Fetrow, Kathryn E. Snell, Carie M. Frantz, Elizabeth J. Trower
Summary: Stromatolites serve as important indicators for studying deep-time paleoclimatic and geobiological conditions. Giant stromatolites found in the Laney Member of the Eocene Green River Formation in Colorado, USA, were influenced by factors such as substrate availability, physicochemical conditions, and lake level changes. The growth of these stromatolites was facilitated by decreased lake levels, which promoted carbonate precipitation and positioned microbial communities within the photic zone.
Article
Environmental Sciences
Lina C. Perez-Angel, Julio Sepulveda, Camilo Montes, Jamila J. Smith, Peter Molnar, Catalina Gonzalez-Arango, Kathryn E. Snell, Nadia Dildar
Summary: This study evaluates the efficacy of stable isotopes in precipitation and plant waxes as proxies for paleoaltimetry and paleohydrology in the northern tropical Andes. Results show a correlation between stable isotope composition and elevation on the eastern flank but not on the western flank. Factors such as mixing of moisture sources, evaporation processes, and differences in vegetation communities may contribute to this discrepancy. Caution should be taken in interpreting paleoelevation and paleoclimate estimates in the western flank.
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
(2022)
Article
Geology
Rebekah E. Simon, David A. Budd, Kathryn E. Snell
Summary: The Niobrara Formation in northeast Colorado, USA, exhibits anomalous negative δO-18 values compared to other Cretaceous chalks. This study utilizes clumped isotopes, peak burial temperatures, and isotopes of carbonate to reevaluate the origin of the calcite's δO-18 depletion. The results suggest that the unique attributes of the Niobrara's diagenetic system, including elevated palaeotemperatures and a semi-open hydrologic system, contribute to its anomalous δO-18 values.
DEPOSITIONAL RECORD
(2023)
Article
Geosciences, Multidisciplinary
Sarah J. Widlansky, Ross Secord, Kathryn E. Snell, Amy E. Chew, William C. Clyde
Summary: This study identifies early Eocene hyperthermals in the Fifteenmile Creek area of the south-central Bighorn Basin, Wyoming, USA. The carbon isotope stratigraphies reveal that the ETM2 and H2 hyperthermals are recorded in this area, and they overlap with previously recognized pulses of mammal turnover. The magnitude of the carbon isotope excursions in this area is smaller than in more northerly Bighorn Basin records.
CLIMATE OF THE PAST
(2022)
Article
Geology
Anne C. Fetrow, Kathryn E. Snell, Russell Di Fiori, Sean P. Long, Joshua W. Bonde
JOURNAL OF SEDIMENTARY RESEARCH
(2020)