Article
Geochemistry & Geophysics
Kimberly Lau, Dalton S. Hardisty
Summary: The geochemistry of carbonate sediments is crucial for understanding ancient seawater evolution, but the application of paleoredox proxies can be limited by diagenesis. Early fluid-buffered diagenesis is ideal for preserving proxies, while alteration in pore fluids with evolved redox conditions can change the primary carbonate geochemistry. Multiple strategies are recommended to identify the preservation of primary seawater geochemistry for different proxies.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Geochemistry & Geophysics
Jack G. Murphy, Anne-Sofie C. Ahm, Peter K. Swart, John A. Higgins
Summary: The records of lithium isotopic composition in seawater preserved in shallow-marine carbonate sediments are valuable for studying the links between silicate weathering, clay formation, global carbon cycle, and Earth's climate over geological time. This study presents measurements of lithium isotopic composition in Neogene shallow-marine carbonates and demonstrates the effects of mineralogy and diagenetic alteration on the variability of bulk sediment δ Li-7 values. The findings suggest that robust 'snapshots' of seawater δ Li-7 values in the past can be obtained from shallow-water marine carbonate sediments.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Geochemistry & Geophysics
K. Mareike Paul, Niels A. G. M. van Helmond, Caroline P. Slomp, Sami A. Jokinen, Joonas J. Virtasalo, Helena L. Filipsson, Tom Jilbert
Summary: Until now, studies on Mo and U enrichment have focused on restricted suboxic-euxinic basins and continental margin oxygen minimum zones (OMZs), neglecting mildly reducing and oxic (but eutrophic) coastal depositional environments. This study investigates 18 coastal sites with varying bottom water redox conditions and finds that Mo and U enrichments can accurately differentiate bottom water oxygen concentration among a range of modern coastal depositional environments. However, secondary factors can bias the enrichments and compromise their reliability in reflecting bottom water redox conditions.
Article
Geology
Megan E. Smith, Peter K. Swart
Summary: The global correlation of negative excursions in delta C-13 values can be used to interpret major environmental changes, but diagenetic processes can affect these correlations.
SEDIMENTARY GEOLOGY
(2022)
Article
Geochemistry & Geophysics
James F. Busch, Eben B. Hodgin, Anne-Sofie C. Ahm, Jon M. Husson, Francis A. Macdonald, Kristin D. Bergmann, John A. Higgins, Justin V. Strauss
Summary: Studying various localities, it was found that Shuram CIE successions share general similarities but differences in water depths may be linked to changes in carbonate diagenesis. The magnitude and duration of the transgression associated with the Shuram CIE are consistent with eustatic fluctuations driven by plate reorganization.
EARTH AND PLANETARY SCIENCE LETTERS
(2022)
Article
Geosciences, Multidisciplinary
Jihad Hamd, Adrian Cerepi, Rudy Swennen, Corinne Loisy, Serge Galaup, Lea Pigot
Summary: This paper studies the sedimentary and diagenetic factors controlling the heterogeneity and petrophysical properties of carbonate reservoir systems. The research findings show that diagenetic processes such as dolomitization play a crucial role in the development of porosity and permeability in reservoir rocks.
MARINE AND PETROLEUM GEOLOGY
(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
Geosciences, Multidisciplinary
Guoqiang Luan, Karem Azmy, Rudi Meyer, Babatunde Olanipekun, Chunmei Dong
Summary: This study investigates the origin of carbonate cements in the Ben Nevis sandstones through various analyses. The results suggest that these cements mainly originate from early precipitation and dissolution of bioclasts, with the involvement of organic carbon during progressive burial. The development of secondary porosity is closely related to the dissolution of calcite cements.
MARINE AND PETROLEUM GEOLOGY
(2023)
Article
Geochemistry & Geophysics
Roger N. Bryant, Theodore M. Present, Anne-Sofie C. Ahm, Harry-Luke O. McClelland, Dan Razionale, Clara L. Blattler
Summary: This study examines the environmental factors driving early marine cementation in the Capitan Reef Complex in West Texas using stable isotope patterns. The results suggest that microbial sulfate reduction and recrystallization of carbonate phases were spatially and temporally coincident, leading to the incorporation of enriched sulfur isotopes in diagenetic calcite. The study also reveals that local diagenetic conditions influenced the extent of sulfur isotopic enrichment in carbonates compared to seawater. Additionally, the sulfate concentration in the Delaware Basin may have been lower during the Permian, resulting in more extensive isotopic evolution during carbonate recrystallization.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Geosciences, Multidisciplinary
Daniel H. James, Harold J. Bradbury, Gilad Antler, Zvi Steiner, Alec M. Hutchings, Xiaole Sun, Raoul Saar, Mervyn Greaves, Alexandra Turchyn
Summary: The pore fluid geochemistry data from the Gulf of Aqaba and the Iberian Margin show strong correlations among calcium, magnesium, strontium, and sulfate concentrations, indicating active changes in redox state and pH. Despite changes in other major ions and their isotopic composition, the calcium isotope composition of pore fluid calcium remains relatively stable in our measured profiles.
FRONTIERS IN EARTH SCIENCE
(2021)
Article
Geology
Cecilia B. Sanders, John C. Eiler, John P. Grotzinger
Summary: This study provides a paragenetic framework for phosphatic and non-phosphatic lithofacies of the Salitre Formation and reveals that the primary differences in porewater biogeochemistry may be the main mechanism controlling the distribution of phosphate and non-phosphate cements. Therefore, this study suggests that the ecology of the Ediacaran seafloor controlled the style and quality of mineralization observed today, and the presence of CFA cements in these rocks represents a unique taphonomic window for select microbial communities.
SEDIMENTARY GEOLOGY
(2023)
Article
Geosciences, Multidisciplinary
Mastaneh H. Liseroudi, Omid H. Ardakani, Per K. Pedersen, Hamed Sanei
Summary: The diagenetic evolution of sedimentary basins is crucial to resource exploration, development, and CCUS. This study investigates the carbonate diagenesis in the Western Canadian Sedimentary Basin to understand the origin of diagenetic fluids, flow systems, and their association with the tectonics and hydrogeology of the basin. Integrated petrographic and isotope geochemical studies provide insights into the regional history of paleofluid flow and driving mechanisms.
MARINE AND PETROLEUM GEOLOGY
(2022)
Article
Geochemistry & Geophysics
Robert Klaebe, Peter Swart, Robert Frei
Summary: The study investigates the heterogeneity of 853Cr values on a modern marine carbonate platform and compares new 853Cr values from carbonate sediments to modern carbonate sediments accumulating on the platform. The variability in 853Cr values is found to be related to changes in sediment composition and mineralogy, rather than fluctuations in water column redox conditions.
Article
Geochemistry & Geophysics
Philip T. Staudigel, John A. Higgins, Peter K. Swart
Summary: This study utilized a numerical model and various isotope measurement techniques to investigate the changes in fluid advection rates over time, revealing a significant shift in the relative contributions of different mechanisms governing fluid flow around 13 million years ago.
EARTH AND PLANETARY SCIENCE LETTERS
(2021)
Article
Geochemistry & Geophysics
Huyue Song, Teng Xing, Eva E. Stueken, Yong Du, Yuanyuan Zhu, Xiaowan Tao, Qian Ni, Haijun Song
Summary: By analyzing sedimentary rock samples from different time periods, we found that δ15Nbulk is generally higher than δ15NDCN, indicating preferential loss of acid-soluble organic nitrogen with higher δ15N values during decarbonization. In anoxic environments, δ15NDCN is generally higher than δ15Nkerogen, which may be linked to ammonium accumulation. In some cases, δ15Nkerogen is greater than δ15NDCN, which may reflect preferential release of 14NH4+ from organic matter or biological production of isotopically light NH4+.
Article
Geography, Physical
Ashleigh van Smeerdijk Hood, Malcolm William Wallace
GLOBAL AND PLANETARY CHANGE
(2018)
Article
Geology
Malcolm W. Wallace, Ashleigh van S. Hood
SEDIMENTARY GEOLOGY
(2018)
Article
Multidisciplinary Sciences
Eric J. Bellefroid, Ashleigh V. S. Hood, Paul F. Hoffman, Matthew D. Thomas, Christopher T. Reinhard, Noah J. Planavsky
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2018)
Article
Multidisciplinary Sciences
Sean McMahon, Ashleigh V. S. Hood, John Parnell, Stephen Bowden
NATURE COMMUNICATIONS
(2018)
Article
Geosciences, Multidisciplinary
Eric J. Bellefroid, Noah J. Planavsky, Ashleigh V. S. Hood, Galen P. Halverson, Kasparas Spokas
AMERICAN JOURNAL OF SCIENCE
(2019)
Article
Geochemistry & Geophysics
Guang-Yi Wei, Ashleigh V. S. Hood, Xi Chen, Da Li, Wei Wei, Bin Wen, Zheng Gong, Tao Yang, Zhao-Feng Zhang, Hong-Fei Ling
EARTH AND PLANETARY SCIENCE LETTERS
(2019)
Editorial Material
Geology
Lidya G. Tarhan, Ashleigh van S. Hood, Mary L. Droser, James G. Gehling, Derek E. G. Briggs, Robert R. Gaines, Leslie J. Robbins, Noah J. Planavsky
Article
Geosciences, Multidisciplinary
Malcolm W. Wallace, Ashleigh V. S. Hood, Joe Fayle, Emily S. Hordern, Tessa F. O'Hare
PRECAMBRIAN RESEARCH
(2019)
Article
Geography, Physical
L. M. E. Percival, D. P. G. Bond, M. Rakocinski, L. Marynowski, A. V. S. Hood, T. Adatte, J. E. Spangenberg, K. B. Foellmi
GLOBAL AND PLANETARY CHANGE
(2020)
Article
Multidisciplinary Sciences
Maxwell A. Lechte, Malcolm W. Wallace, Ashleigh van Smeerdijk Hood, Weiqiang Li, Ganqing Jiang, Galen P. Halverson, Dan Asael, Stephanie L. McColl, Noah J. Planavsky
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2019)
Article
Geochemistry & Geophysics
Mingyu Zhao, Lidya G. Tarhan, Yiyue Zhang, Ashleigh Hood, Dan Asael, R. Pamela Reid, Noah J. Planaysky
Summary: Carbonate zinc isotopes are increasingly used to track changes in seawater zinc isotopic composition. Recent studies, particularly under the GEOTRACES program, have expanded our understanding of zinc behavior in the water column. However, the incorporation of water-column zinc isotopic signals into carbonate sediments is still at an early stage.
EARTH AND PLANETARY SCIENCE LETTERS
(2021)
Article
Biology
Ashleigh V. S. Hood, Donald E. Penman, Maxwell A. Lechte, Malcolm W. Wallace, Jonathan A. Giddings, Noah J. Planavsky
Summary: The 'snowball Earth' hypothesis proposes that two intense glaciations occurred in the Neoproterozoic around 717-635 million years ago, impacting biogeochemical cycles. However, evidence from the Sturtian glaciation suggests continued carbonate precipitation and magnesium cycling, challenging previous assumptions. This may explain the extreme duration of the Sturtian glaciation.
Article
Biology
Brennan O'Connell, Malcolm W. Wallace, Ashleigh v. S. Hood, Luke Rebbechi, Hannah L. Brooks
Summary: Stromatolites and microbialites contain valuable environmental and biological information, with deep water cuspate stromatolites being formed in deep water settings during maximum transgression, likely requiring low light and low oxygen conditions for microbial metabolism. The link between cuspate morphology and physical/chemical conditions of Precambrian deep water marine settings is suggested by the origin of cuspate stromatolites from the Trezona Formation and other Precambrian formations.
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)