Article
Geosciences, Multidisciplinary
M. Janssen, L. Caracciolo, L. M. Bonnell, R. H. Lander, A. Munnecke, A. Beltran-Trivino, F. Muto, H. Stollhofen
Summary: Depositional environment, climate, diagenetic processes, and sediment composition are important factors controlling the precipitation and distribution of near-surface carbonate cements. Simulation studies show that early carbonate cementation has a significant impact on compaction behavior and porosity reduction during burial, resulting in less pore loss.
MARINE AND PETROLEUM GEOLOGY
(2023)
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
Mohammed S. Hashim, Stephen E. Kaczmarek
Summary: The presence of magnesium in natural waters can strongly inhibit calcite precipitation and the transformation of aragonite to calcite. The rate at which aragonite stabilizes to calcite increases with lower fluid:solid ratios. Increases in fluid:solid ratio also lead to greater incorporation of magnesium into calcite products, suggesting that fluid:solid ratio is an important factor in carbonate diagenesis.
EARTH AND PLANETARY SCIENCE LETTERS
(2021)
Article
Geosciences, Multidisciplinary
Renata E. B. Araujo, Vincenzo La Bruna, Andrea Rustichelli, Milton M. Xavier, Fabrizio Agosta, Francisco H. R. Bezerra, Marcio F. P. Brito, Jose A. Barbosa, Antonio C. D. Antonino
Summary: Karst processes play a critical role in the development of porosity and permeability in carbonate reservoirs and aquifers. This study examines the interaction between fluid flow pathways and diagenesis in an epigenic karst setting in the Potiguar Basin, Brazil. The results demonstrate the importance of karst dissolution in creating karst cavities, and how various types of porosity can be connected to fractures, veins, and stylolites at the microscale. Additionally, karst dissolution can increase overall rock permeability through cement dissolution and fracturing during different diagenetic stages.
MARINE AND PETROLEUM GEOLOGY
(2023)
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
Environmental Sciences
Adam Subhas, Sijia Dong, John D. Naviaux, Nick E. Rollins, Patrizia Ziveri, William Gray, James W. B. Rae, Xuewu Liu, Robert H. Byrne, Sang Chen, Christopher Moore, Loraine Martell-Bonet, Zvi Steiner, Gilad Antler, Huanting Hu, Abby Lunstrum, Yi Hou, Nathaniel Kemnitz, Johnny Stutsman, Sven Pallacks, Mathilde Dugenne, Paul D. Quay, William M. Berelson, Jess F. Adkins
Summary: The cycling of biologically produced calcium carbonate in the ocean is crucial for the global carbon cycle. This study investigates the dissolution rates of coccolith and foraminiferal calcite and combines them with other data to understand the alkalinity cycle in the shallow North Pacific Ocean. The findings show that the dissolution rates are too slow to explain the sinking flux of calcium carbonate and the regeneration of alkalinity. Instead, the dissolution is driven by the ambient saturation state and oxygen consumption, which explains the patterns of calcium carbonate flux and alkalinity regeneration in the North Pacific.
GLOBAL BIOGEOCHEMICAL CYCLES
(2022)
Article
Geochemistry & Geophysics
Y. Ge
Summary: Extensive early marine cementation at the seafloor has important environmental implications and its driving factors are still controversial. This study investigates multiple factors involved in early marine cementation based on analysis of the Abu Dhabi coastal area in the Persian Gulf. The results suggest that factors such as CaCO3 saturation, saturation gradient, higher sea level, and the formation of shallow redox boundary contribute to extensive early marine cementation.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2022)
Article
Geosciences, Multidisciplinary
Sardar M. Balaky, Maha M. Al-Dabagh, Irfan Sh. Asaad, Mazin Tamar-Agha, Mohammed S. Ali, Ahmed E. Radwan
Summary: This research emphasizes the significance of sedimentological and petrophysical heterogeneity in carbonate oil exploration in northwestern and northern Iraq.
MARINE AND PETROLEUM GEOLOGY
(2023)
Article
Geosciences, Multidisciplinary
Yangrui Guo, Wenfeng Deng, Xi Liu, Kai Kong, Wen Yan, Gangjian Wei
Summary: This study focuses on the Delta(47) values of island carbonates from the Meiji Reef in the South China Sea to constrain the diagenetic environment, finding that most diagenetic alteration likely occurred at water depths around 200 meters below sea level at temperatures between 15 and 28 degrees Celsius. The fluids involved in the formation of diagenetic calcites and dolomites have similar delta O-18 values to modern seawater.
Article
Energy & Fuels
Bo Jiu, Wenhui Huang, Nana Mu, Yuan Li
Summary: Continuous advancements in oil and gas exploration technology have shifted the focus towards ultradeep reservoirs due to increasing demand for resources. This study examines the carbonate karst reservoirs in the Ordovician Ma5 Member in the southeastern Ordos Basin, analyzing development characteristics, types, and influencing factors of paleokarst reservoirs. Petrology and geochemistry indicate three types of karstification processes, controlled by freshwater and thermochemical sulfate reduction, resulting in diverse dissolution pores and fractures in the reservoirs.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2021)
Article
Geology
Arthur Saller, Charlotte Winterbottom
Summary: This study examined Cenozoic limestones from Hawaii and Enewetak to understand the diagenesis in deep sea water. The results showed that the dominant minerals in Hawaii samples were fibrous aragonite and high-magnesium calcite, while high-magnesium calcite in Enewetak samples transformed into low-magnesium calcite in deep sea water. The dissolution of aragonite and conversion of high-magnesium calcite to low-magnesium calcite varied with depth, indicating the influence of water depth on diagenesis.
DEPOSITIONAL RECORD
(2023)
Article
Geochemistry & Geophysics
Maria C. Figueroa, Sebastiaan J. van de Velde, Daniel D. Gregory, Sydnie Lemieux, Jeana Drake, Tina Treude, Nathaniel Kemnitz, William Berelson, Konstantin Choumiline, Steven Bates, Ravi Kukkadapu, Marilyn Fogel, Natascha Riedinger, Timothy W. Lyons
Summary: This study investigates the early diagenetic interplay between reactive iron, sulfur, and organic matter in the bathymetrically isolated Santa Monica Basin sediments. The results show that the basin sediments do not exhibit the traditional geochemical signatures of oxygen-deficient settings, with a lack of dissolved sulfide accumulation and sulfurized iron. The study also highlights the enrichment of reactive iron and its coexistence with high levels of dissolved iron in the sediments.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2023)
Article
Energy & Fuels
Ye Yu, Li Fengfeng, Song Xinmin, Guo Rui
Summary: The study focused on the transformation mechanism of muddy carbonate rock by the coupling of bioturbation and diagenesis in the Cretaceous strata of the Mesopotamia Basin, Middle East. Three ways of biological transformation of rocks were identified, mainly occurring during the penecontemporaneous phase. This process was influenced by factors such as rock type, sea level decline, burrow abundance, infillings, and water environment. The physical properties of muddy carbonate rocks were improved by bioturbation, especially when burrows were filled with coarse-grained debris or fine-crystalline dolomite.
PETROLEUM EXPLORATION AND DEVELOPMENT
(2021)
Article
Geosciences, Multidisciplinary
Hao Fang, Dongjie Tang, Xiaoying Shi, Limin Zhou, Xiqiang Zhou, Mengting Wu, Huyue Song, Robert Riding
Summary: This study examines shallow marine carbonates from approximately 1.57 billion years ago using sedimentological and geochemical methods. The results indicate the presence of different sediment types formed under varying conditions, suggesting the occurrence of redox fluctuations. Cyanobacterial productivity is hypothesized to be a key influence on water column redox cyclicity during the Mesoproterozoic.
PRECAMBRIAN RESEARCH
(2022)
Article
Geochemistry & Geophysics
Sean J. Loyd, Patrick Meister, Bo Liu, Kevin Nichols, Frank A. Corsetti, Robert Raiswell, William Berelson, Graham Shields, Mark Hounslow, John W. F. Waldron, Bayne Westrick-Snapp, Jamie Hoffman
Summary: The early diagenesis of marine organic matter has a significant impact on Earth's surface chemistry, particularly in terms of carbon burial potential and the formation of authigenic minerals such as carbonate concretions. The formation of these concretions is closely related to microbial anaerobic diagenetic reactions that degrade organic matter and methane, with some reactions requiring an external oxidant. Changes in the oxidation state of Earth's oceans over time can therefore influence the mechanisms of concretion formation. Variability in the carbon isotope compositions of concretions indicates changes in diagenesis in shallow marine sediments, which is associated with the evolving redox landscape of Earth. Transport modeling helps to understand the potential effects of shifting redox chemistry and highlights the importance of organic carbon supply to the seafloor, marine sulfate concentrations, methane production, and external methane influx. The first clear evidence of anaerobic oxidation of methane-derived concretions occurred during the Carboniferous period, coinciding with the increased marine sulfate levels in the Paleozoic era. The lower variability observed in older concretions, particularly the Precambrian ones, may be attributed to a smaller marine sulfate reservoir and possibly elevated concentrations of marine dissolved inorganic carbon. The reasons behind the increase in maximum carbon isotope values over time are still not fully understood but may be related to isotopic equilibration between dissolved inorganic carbon and externally-derived methane. Ultimately, the isotopic record of concretions reflects changes in the availability of organic matter and the oxidation state of the marine environment, providing insights into the subsurface biosphere and diagenesis throughout geological time.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2023)
Article
Oceanography
Richard S. Taylor, David J. DeMaster, David J. Burdige
DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS
(2020)
Article
Environmental Sciences
Lily M. Walker, Paul A. Montagna, Xinping Hu, Michael S. Wetz
Summary: Tropical cyclones can have a significant impact on water quality in coastal ecosystems, but the effects are usually short-lived. In the case of Hurricane Harvey, the Guadalupe Estuary and its watershed experienced the highest rainfall and wind speeds, resulting in temporary changes in salinity and nutrients that returned to baseline levels within a few months.
ESTUARIES AND COASTS
(2021)
Correction
Environmental Sciences
Xinping Hu, Hongming Yao, Cory J. Staryk, Melissa R. McCutcheon, Michael S. Wetz, Lily Walker
FRONTIERS IN MARINE SCIENCE
(2021)
Article
Environmental Sciences
Wei-Jen Huang, Wei-Jun Cai, Xinping Hu
Summary: The study found that strong seasonal net DIC removal occurred in the near-surface water during summer on the northern Gulf of Mexico continental shelf, while the net DIC production peak in the near-bottom, subsurface waters was observed between July and September. The delayed coupling between eutrophic surface and hypoxic bottom waters suggests a similar pattern may be seen in other nutrient-rich, river-dominated ocean margins worldwide.
FRONTIERS IN MARINE SCIENCE
(2021)
Article
Environmental Sciences
Nicholas A. Rosenau, Holly Galavotti, Kimberly K. Yates, Curtis C. Bohlen, Christopher W. Hunt, Matthew Liebman, Cheryl A. Brown, Stephen R. Pacella, John L. Largier, Karina J. Nielsen, Xinping Hu, Melissa R. McCutcheon, James M. Vasslides, Matthew Poach, Tom Ford, Karina Johnston, Alex Steele
Summary: The study conducted by the United States Environmental Protection Agency's National Estuary Program (NEP) in collaboration with partners in seven estuaries along the East Coast, West Coast, and the Gulf of Mexico demonstrated that temperature and pCO(2) covaried across all water bodies, with average pCO(2) being lower in cooler, winter months and higher in warmer, summer months. The research also found that both thermal and non-thermal influences are important drivers of pCO(2) in Tampa Bay and Mission-Aransas Estuary, while non-thermal processes, notably coastal upwelling, are responsible for pCO(2) values in West Coast water bodies. The study highlights the importance of high-quality carbonate chemistry observations in estuarine environments using autonomous sensors originally designed for open-ocean settings.
FRONTIERS IN MARINE SCIENCE
(2021)
Article
Environmental Sciences
Li-Qing Jiang, Denis Pierrot, Rik Wanninkhof, Richard A. Feely, Bronte Tilbrook, Simone Alin, Leticia Barbero, Robert H. Byrne, Brendan R. Carter, Andrew G. Dickson, Jean-Pierre Gattuso, Dana Greeley, Mario Hoppema, Matthew P. Humphreys, Johannes Karstensen, Nico Lange, Siv K. Lauvset, Ernie R. Lewis, Are Olsen, Fiz F. Perez, Christopher Sabine, Jonathan D. Sharp, Toste Tanhua, Thomas W. Trull, Anton Velo, Andrew J. Allegra, Paul Barker, Eugene Burger, Wei-Jun Cai, Chen-Tung A. Chen, Jessica Cross, Hernan Garcia, Jose Martin Hernandez-Ayon, Xinping Hu, Alex Kozyr, Chris Langdon, Kitack Lee, Joe Salisbury, Zhaohui Aleck Wang, Liang Xue
Summary: Effective data management is crucial for oceanographic research, and this article introduces new and updated best practice data standards for discrete chemical oceanographic observations. These standards cover column header abbreviations, quality control flags, missing value indicators, and standardized calculation of certain properties. The aim is to improve current practices, promote international usage, and facilitate data sharing and permanent archiving for better research in ocean biogeochemistry.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Engineering, Environmental
Hongming Yao, Paul A. Montagna, Michael S. Wetz, Cory J. Staryk, Xinping Hu
Summary: As coastal areas become more vulnerable to climate impacts, understanding estuarine carbon budgets with high spatiotemporal resolution is crucial. This study constructed a mass balance model for carbon fluxes in four estuaries along the northwestern Gulf of Mexico coast over a four-year period. The results showed that the lateral exchanges of total organic carbon and dissolved inorganic carbon were the main inputs into these estuaries, while oceanic export was the major pathway for carbon losses. The study also highlighted the large variability of the carbon budget in response to hydrologic changes.
Article
Environmental Sciences
Melissa R. McCutcheon, Xinping Hu
Summary: Based on a four-decade dataset, this study examines the long-term trends and spatial patterns of CO2 concentration, pH value, and other related parameters in seven estuaries along the northwestern Gulf of Mexico. The study finds that these estuaries have generally experienced increasing pCO2 and decreasing values of DIC, omega(Ar), and beta(DIC), with the magnitude of change increasing from north to south. These findings suggest that these estuaries have become a greater source of CO2 to the atmosphere over the last few decades, potentially impacting calcification rates of important estuarine organisms.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Environmental Sciences
Xinping Hu, Hongming Yao, Melissa R. McCutcheon, Larissa Dias, Cory J. Staryk, Michael S. Wetz, Paul A. Montagna
Summary: In the northwestern Gulf of Mexico, the coastal climate plays a significant role in controlling freshwater discharge into estuaries. This study investigates the effect of hydrological conditions on the water aragonite saturation state in these estuaries. The results show that the availability of freshwater influences the fluctuation and emergence time of aragonite saturation state in estuaries and their sub-embayments.
FRONTIERS IN ENVIRONMENTAL SCIENCE
(2022)
Article
Geochemistry & Geophysics
Larissa M. M. Dias, Xinping Hu, Hang Yin
Summary: Estuarine total alkalinity (TA) in the Mission-Aransas Estuary (MAE) of the northwestern Gulf of Mexico experienced losses beyond what can be attributed to calcification during droughts, with the oxidation of reduced sulfur contributing to the TA loss. This biogeochemical process may also occur in other subtropical, freshwater-starved estuaries around the world.
AQUATIC GEOCHEMISTRY
(2023)
Article
Environmental Sciences
M. S. Sankar, Padmanava Dash, YueHan Lu, Xinping Hu, Andrew E. Mercer, Sudeera Wickramarathna, Wondimagegn T. Beshah, Scott L. Sanders, Zikri Arslan, Jamie Dyer, Robert J. Moorhead
Summary: This study evaluated the seasonal changes in trace elements, nutrients, dissolved organic matter (DOM), and carbonate system parameters in the deteriorating oyster reef in the Western Mississippi Sound. The results showed higher concentrations of nutrients and organic matter during summer, while trace elements and acidification parameters were lower. These findings have important implications for the health of the oyster reefs and the coastal economy.
ENVIRONMENTAL MONITORING AND ASSESSMENT
(2023)
Review
Oceanography
Emily Osborne, Xinping Hu, Emily R. Hall, Kimberly Yates, Jennifer Vreeland-Dawson, Katie Shamberger, Leticia Barbero, J. Martin Hernandez-Ayon, Fabian A. Gomez, Tacey Hicks, Yuan-Yuan Xu, Melissa R. McCutcheon, Michael Acquafredda, Cecilia Chapa-Balcorta, Orion Norzagaray, Denis Pierrot, Alain Munoz-Caravaca, Kerri L. Dobson, Nancy Williams, Nancy Rabalais, Padmanava Dash
Summary: Ocean acidification has variable impacts on the Gulf of Mexico due to its unique coastal dynamics. Limited research has been conducted on the region-specific effects of acidification, making it challenging to understand the ecological and socioeconomic impacts. However, it is important to study and monitor this region due to its valuable marine ecosystems and economies.
PROGRESS IN OCEANOGRAPHY
(2022)
Article
Environmental Sciences
Michelle A. Johnston, Michael S. Studivan, Ian C. Enochs, Adrienne M. S. Correa, Nicole Besemer, Ryan J. Eckert, Kimberly Edwards, Ryan Hannum, Xinping Hu, Marissa Nuttall, Kelly O'Connell, Ana M. Palacio-Castro, George P. Schmahl, Alexis B. Sturm, Blake Ushijima, Joshua D. Voss
Summary: East and West Flower Garden Bank in the Gulf of Mexico experienced a disease outbreak in August 2022, with disease-like lesions observed on seven coral species. Rapid response cruises were conducted to characterize the disease, treat affected corals, and collect baseline images. This provides an opportunity to study coral disease in a relatively healthy ecosystem and inform mitigation efforts.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Limnology
Hang Yin, Xinping Hu, Larissa M. Dias
Summary: This study used water quality parameters from 2000 to 2020 to analyze the spatial and temporal variations of sulfate in estuaries of the northwestern Gulf of Mexico. The findings showed that sulfate enrichment was associated with a low river discharge period from 2012 to 2014 in all estuaries. Sedimentary sulfide oxidation has the potential to reduce alkalinity in estuarine waters, but during an extreme drought, alkalinity enrichment and depletion were also observed, partially due to carbonate dissolution and other proton removal pathways, as well as uncertainties in the estimation model. The close coupling between river discharge variation and estuarine sulfate dynamics will significantly impact estuarine carbonate chemistry under a changing climate.
LIMNOLOGY AND OCEANOGRAPHY LETTERS
(2023)
Article
Ecology
Melissa R. McCutcheon, Hongming Yao, Cory J. Staryk, Xinping Hu
Summary: The coastal ocean experiences significant seasonal and diel variability in carbonate chemistry parameters, with pH highest in winter and pCO2 highest in summer. Temperature, biological activity, freshwater inflow, and tide level are important controls on the carbonate system, and their effects differ on different timescales. Despite temporal variability, discrete sampling generally reflects average conditions on a seasonal and annual basis.
