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
Benjamin R. Fosu, Prosenjit Ghosh, Tobias B. Weisenberger, Simon Spuergin, Shrinivas G. Viladkar
Summary: Carbonatites, composed mainly of carbonates, were studied using triple oxygen isotope analyses to understand their formation processes and evaluate the oxygen isotope behavior during their genesis. Results show that the isotopic fractionation in different carbonate phases is similar, independent of mineralogy, suggesting variations may be related to rock alteration. The study also indicates that diagenetic alteration and mixing of carbonate sources can significantly impact the isotopic compositions of carbonatites, obliterating their primary mantle signatures.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2021)
Article
Environmental Sciences
Jie Ren, Zhengxiang Lv, Honghui Wang, Jianmeng Wu, Shunli Zhang
Summary: High-precision in situ delta O-18 values obtained using SIMS were utilized to study the origin of quartz cement in deep-buried sandstones in western Sichuan Basin, China. Three distinctive quartz precipitation phases (Q1, Q2, Q3) with different formation temperatures and delta O-18 values were identified through petrographic, CL, and fluid inclusion data analysis. Changes in delta O-18((water)) and trace element composition from Q2 to Q3 indicate significant alterations in pore fluid chemistry due to hydrocarbon emplacement and water-rock interactions.
Article
Geosciences, Multidisciplinary
Yifan Zhang, Kelai Xi, Yingchang Cao, Xianzhang Yang, Zhenping Xu, Lu Zhou, Guoding Yu, Zhanghua Han, Zehan Zhang
Summary: Understanding diagenetic fluid types and their effects on diagenesis is crucial for identifying control factors of reservoir characteristics and predicting reservoir sweet spots. This study investigated strong cementation in Lower Jurassic Ahe Formation sandstones near a deep-rooted fault using petrographic and geochemical methods. The results suggest the involvement of deep fluids in reservoir diagenesis and highlight the negative effects of deep fluids on diagenetic processes.
MARINE AND PETROLEUM GEOLOGY
(2023)
Article
Multidisciplinary Sciences
C. Saetre, H. Hellevang, C. Dennehy, H. Dypvik
Summary: This study investigates the geochemical system of the Rosebank field in the Faroe-Shetland Basin, focusing on the dissolution and precipitation effects at the basalt-sandstone interface. The results show that the dissolution and precipitation processes control the basalt dissolution rate, while diffusion has minimal impact on reservoir quality.
SCIENTIFIC REPORTS
(2021)
Article
Multidisciplinary Sciences
M. Tatzel, P. J. Frings, M. Oelze, D. Herwartz, N. K. Luensdorf, M. Wiedenbeck
Summary: The O-18/O-16 ratio of cherts increases over time, and two explanations have been proposed: cooling seawater temperature and increasing seawater delta O-18. However, this study shows that cherts are a reliable record of diagenetic temperatures, and the timing and temperature of quartz precipitation are determined by the kinetics of silica diagenesis. Heat flow through the sediment column has decreased over time, accounting for part of the increase in delta O-18(chert), which eliminates the need for extreme seawater temperature or delta O-18(sw) reconstructions.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Geochemistry & Geophysics
Nataniel Bialas, Oleg Prymak, Ningthoujam Premjit Singh, Debajyoti Paul, Rajeev Patnaik, Matthias Epple
Summary: The study analyzed the microstructure and composition of enamel in fossil and extant proboscidean teeth to assess diagenetic alterations, finding that there were no or only negligible modifications in the fossils collected and that these minor alterations were not age-dependent. This indicates that diagenesis has not significantly affected the samples studied and they are suitable for chemical and paleontological studies and as proxies for reconstructing paleoclimate and paleoenvironment.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2021)
Article
Environmental Sciences
Yue Cen, Jiasheng Wang, Thomas J. Algeo, Zhou Wang, Xiaochen Ma, Can Chen
Summary: Upward diffusing methane in gas hydrate geological systems is consumed in the sediment and water column by biogeochemical reactions, leading to diagenetic alteration of buried foraminiferal tests. This study focuses on the microstructure and elemental composition of buried foraminiferal tests to understand the impact of methane release events. The results suggest that foraminiferal tests are highly susceptible to alteration by methane-bearing fluids, and the elemental ratios of diagenetically altered tests can serve as reliable proxies for paleo-methane release events. The study also reveals frequent vertical fluctuations of the sulfate-methane transition zone in the studied area, indicating variable fluid flux and methane release rates.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Geosciences, Multidisciplinary
Muhammad Kashif, Yingchang Cao, Nizam Ud Din, Uzair Siddique, Kelai Xi, Faisal Rehman, Noor Ahmed, Xihao Gu, Mohammad Saleh Gaghman
Summary: The precipitation of authigenic quartz significantly affects reservoir characteristics and rock stiffness. The Es-1 sandstone in the Nanpu Sag is an important hydrocarbon producing rock. Different methods have been used to analyze the origin of quartz cement and its impact on reservoir quality. The dominant clay minerals in the Es-1 sandstone, such as kaolinite and mixed layer illite to smectite, reduce reservoir quality. Quartz cement is present in two stages: pore filling authigenic cement and quartz overgrowth cement.
ACTA GEOLOGICA SINICA-ENGLISH EDITION
(2022)
Article
Geochemistry & Geophysics
Daniel E. Ibarra, Anastasia G. Yanchilina, Max K. Lloyd, Katharina A. Methner, C. Page Chamberlain, Ruth Yam, Aldo Shemesh, Daniel A. Stolper
Summary: The oxygen isotopic composition of silica preserved in oceanic sediments has been studied in this research. The results show that the transformation and recrystallization processes of biogenic opal-A to opal-CT to microquartz in deep sea sediments have significant effects on the triple oxygen isotopic composition of chert. The findings suggest that the local temperature gradients and pore fluid oxygen isotopic compositions influence the measured values of chert, deviating from triple oxygen isotopic equilibrium with seawater.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Geosciences, Multidisciplinary
Jingyi Wang, Fujie Jiang, Qinhong Hu, Chunlin Zhang, Xiaoguang Yang, Wuling Mo, Xirong Wang, Zhenguo Qi
Summary: The central and eastern Paleozoic Carboniferous Benxi Formation in the Ordos Basin, China's largest gas-producing area, poses challenges for exploration due to extreme diagenesis, complex pore structure, and strong heterogeneity. This study conducted qualitative and quantitative analyses to investigate the development and controlling factors of secondary porosity in the formation. The findings provide a basis for predicting favorable reservoirs in the tight sandstones of the Benxi Formation in the Ordos Basin.
MARINE AND PETROLEUM GEOLOGY
(2023)
Review
Geosciences, Multidisciplinary
Nordine Bouden, Johan Villeneuve, Yves Marrocchi, Etienne Deloule, Evelyn Furi, Andrey Gurenko, Laurette Piani, Emilie Thomassot, Paula Peres, Firmino Fernandes
Summary: Secondary ion mass spectrometry (SIMS) is a powerful technique for in situ triple oxygen isotope measurements that has been developed over 30 years. With advancements such as the MC-SIMS system, it is now possible to routinely measure oxygen isotopic ratios in various matrices with high precision and spatial resolution. This paper focuses on the application of the MC-SIMS technique to the in situ monitoring of mass-independent triple oxygen isotope variations.
FRONTIERS IN EARTH SCIENCE
(2021)
Article
Geosciences, Multidisciplinary
Janne Liebmann, Christopher L. Kirkland, John B. Cliff, Christopher J. Spencer, Aaron J. Cavosie
Summary: Oxygen isotopes are widely used in the Earth sciences to study temperature, paleoclimate, fluid-rock interaction, magmatic petrogenesis, and identification of extraterrestrial materials. Zircon is an important mineral for understanding Earth's crustal evolution through its primary magmatic oxygen isotope records. This paper presents a framework for measurement, assessment, and reporting of zircon oxygen isotope data, aiming to provide geologically meaningful interpretations.
GEOSCIENCE FRONTIERS
(2023)
Article
Geosciences, Multidisciplinary
Janne Liebmann, Christopher L. Kirkland, John B. Cliff, Christopher J. Spencer, Aaron J. Cavosie
Summary: Oxygen isotopes are widely used in the Earth sciences to address various research questions, such as geothermometry, paleoclimatology, geochemical tracing, and planetary sciences. Zircon is a valuable mineral in understanding Earth's crustal evolution due to its robust records of primary magmatic O isotope ratio. This paper presents a comprehensive framework for the measurement, assessment, and reporting of zircon O isotope data, focusing on in situ analysis using secondary ion mass spectrometry.
GEOSCIENCE FRONTIERS
(2023)
Article
Geochemistry & Geophysics
Pengfei Di, Niu Li, Shanggui Gong, Joern Peckmann, Shuhong Wang, Duofu Chen, Wen Yan
Summary: This study investigates the resilience of carbonate-associated sulfate (CAS) isotopic signatures in reef carbonates, providing new insights for the reconstruction of ancient seawater sulfate sulfur and oxygen isotopes. The results indicate that reef carbonates can faithfully record changes in coeval seawater sulfur isotopes, regardless of diagenetic alteration, including dolomitization. However, the oxygen isotope composition of CAS is more susceptible to alteration during diagenesis.
Article
Geochemistry & Geophysics
Maria Rosa Scicchitano, Romain Lafay, John W. Valley, Noriko T. Kita, William O. Nachlas
Summary: The study of serpentinites and ophicarbonates from ophiolitic terrains provides insights into the hydration and carbonation processes of modern oceanic lithosphere. The Chenaillet ophiolite in the western Alps, resembling a slow spreading center, was weakly affected by metamorphism. In this study, in situ analysis of oxygen and carbon isotopes in different minerals was conducted to understand the formation processes of ophicarbonates in the Chenaillet ophiolite. The results identify multiple stages of alteration and provide evidence for protracted serpentinization and carbonation similar to modern mid-ocean ridge venting systems.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Geology
Cameron J. Batchelor, Shaun A. Marcott, Ian J. Orland, Kouki Kitajima
Summary: Subannual climate reconstructions of the Holocene are rare. This study used specialized imaging and microanalysis techniques to analyze a speleothem from mid-continental North America and revealed a change in winter precipitation patterns during the late Holocene. The findings contribute to a better understanding of the seasonal climate variability in the region.
Article
Multidisciplinary Sciences
Gao-Hua Fan, Jian-Wei Li, John W. Valley, Maria Rosa Scicchitano, Philip E. Brown, Jin-Hui Yang, Paul T. Robinson, Xiao-Dong Deng, Ya-Fei Wu, Zhan-Ke Li, Wen-Sheng Gao, Si-Yuan Li, Shao-Rui Zhao
Summary: This study demonstrates the crucial role of magmatic hydrothermal fluids and their mixing with meteoric water in the formation of the Dongping gold deposit in the North China Craton. The findings highlight the potential use of in situ oxygen isotope analysis of garnet in tracing the origin and evolution of hydrothermal fluids in the Earth's crust that may have formed other giant ore deposits.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Geosciences, Multidisciplinary
Huan Cui, Kouki Kitajima, Ian J. Orland, Jean-Marc Baele, Shuhai Xiao, Alan J. Kaufman, Adam Denny, Michael J. Spicuzza, John H. Fournelle, John W. Valley
Summary: Through studying an outer-shelf section in southern China, we discovered the heterogeneous nature of the Ediacaran Shuram excursion (SE) and proposed that methane oxidation played a crucial role in modulating this anomaly.
PRECAMBRIAN RESEARCH
(2022)
Biographical-Item
Geochemistry & Geophysics
John W. Valley
AMERICAN MINERALOGIST
(2023)
Article
Geochemistry & Geophysics
Maria Rosa Scicchitano, Juan Carlos de Obeso, Tyler B. Blum, John W. Valley, Peter B. Kelemen, William O. Nachlas, William Schneider, Michael J. Spicuzza, Franziska D. H. Wilke, Vladimir Roddatis
Summary: This study presents a new empirical calibration of oxygen isotope fractionation between serpentine and water, aiming to improve the accuracy of reconstructions of fluid-rock interactions during low-temperature serpentinization processes. The new calibration was determined by analyzing oxygen isotope ratios in mineral pairs using SIMS technique and combining the results with existing calibrations. It provides more reliable constraints on the physical-chemical conditions of serpentinization.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2023)
Article
Geosciences, Multidisciplinary
C. J. Batchelor, S. A. Marcott, I. J. Orland, F. He, R. L. Edwards
Summary: The connection between abrupt high-latitude warming during the last glacial period-Dansgaard-Oeschger (DO) events-and rapid climate changes at lower latitudes has revealed inter-hemispheric teleconnections in the ocean-atmosphere system. We examined a speleothem in Wisconsin that grew from 70-50 thousand years ago and found large negative oxygen isotope (δO-18) excursions that correlate with DO events recorded in the ice core of the North Greenland Ice Core Project. Climate simulations suggest that abrupt DO warming would increase the δO-18 of annual precipitation in the study area, supporting the observed negative δO-18 excursions.
Article
Geochemistry & Geophysics
Brittany N. Hupp, D. Clay Kelly, Reinhard Kozdon, Ian J. Orland, John W. Valley
Summary: A study has found that the magnitude of the negative carbon isotope excursion (CIE) during the Paleocene Eocene thermal maximum (PETM) is smaller in marine records than in terrestrial records. This difference is attributed to secondary mechanisms that attenuate or amplify the CIE magnitude in marine and terrestrial records. By comparing different analytical techniques, the study reveals the effects of carbonate diagenesis and sediment mixing on the stratigraphic signature of the CIE.
Article
Geochemistry & Geophysics
Gabriela A. Farfan, Emma S. Bullock, Chunhui Zhou, John W. Valley
Summary: Measurements of trace element chemistry, mineralogy, and isotope geochemistry in farmed pearls provide insights into the environmental conditions recorded in biomineral carbonates.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2023)
Article
Energy & Fuels
Yuyuan Li, Rongcai Song, Zhongrong Mi, Jianhua Qu, En Xie, Andrew C. Aplin, Xiujian Ding, Jidong Li, Kun Lu, Guang Hu
Summary: This paper investigates the composition of retained fluids in an inter-salt lacustrine shale oil system and identifies the predominant lithologies with high oil potential. The study reveals the heterogeneous nature of the sequence and highlights the importance of siltstones, organic-rich calcareous mudstones, dolomitic mudstones, and argillaceous dolomites in inter-salt shale oil development.
GEOENERGY SCIENCE AND ENGINEERING
(2023)
Article
Energy & Fuels
Olakunle J. Oye, Andrew C. Aplin, Ian J. Orland, John W. Valley
Summary: The Fulmar Formation sandstones from the Fulmar Field in the Central North Sea have a burial depth of 3.2 km and a temperature of 128 degrees C. However, their quartz cement content is only 3.7 +/- 1.7% (1 sigma), which is significantly lower than predicted by temperature-related quartz precipitation kinetics models. Oxygen isotope microanalysis of quartz overgrowths indicates limited cementation at temperatures above 110 degrees C. The low volumes of quartz cement can be explained by the effective stress history of the Fulmar Formation, which experienced a decrease in pore fluid pressures and an increase in effective stress due to lateral seal failure.
GEOENERGY SCIENCE AND ENGINEERING
(2023)
Correction
Geochemistry & Geophysics
Kurt S. Panter, Paterno Castillo, Susan Krans, Chad Deering, William McIntosh, John W. Valley, Kouki Kitajima, Philip Kyle, Stan Hart, Jerzy Blusztajn
JOURNAL OF PETROLOGY
(2023)
Article
Geosciences, Multidisciplinary
Nadja Drabon, Benjamin L. Byerly, Gary R. Byerly, Joseph L. Wooden, Michael Wiedenbeck, John W. Valley, Kouki Kitajima, Ann M. Bauer, Donald R. Lowe
Summary: The nature and processes of Earth's early crust are still unknown in Precambrian geology. Recent research using trace element proxies for zircon formation has shed light on crustal processes. A study of materials from the Hadean period reveals a major shift in crustal processes, supporting the idea of global crustal instability and recycling.
Article
Geosciences, Multidisciplinary
Weijiao Ma, Jinbu Li, Min Wang
Summary: The petroleum resource assessment obtained from laboratory tests on old core samples tends to underestimate the in situ resources. This study investigates the hydrocarbon loss and restoration by comparing preserved and exposed core samples. It is found that previous studies have severely underestimated the in situ hydrocarbon potential due to factors such as sample crushing and crucible waiting. A new restoration model is proposed to compensate for these losses.
MARINE AND PETROLEUM GEOLOGY
(2024)
Article
Geosciences, Multidisciplinary
Shaoyun Chen, Yongqiang Yang, Longwei Qiu, Xiaojuan Wang, Erejep Habilaxim
Summary: Quartz cement is an important authigenic mineral in the tight sandstones of the Shaximiao Formation in the Sichuan Basin. This study analyzed the silicon sources of the quartz cement using mineralogical, fluid inclusion, and geochemical data. The results showed that smectite alteration and dissolution of aluminosilicate minerals were the primary sources of silicon for quartz cementation. Contributions from volcanic material hydrolysis and pressure solution were relatively minor. The presence of chlorite films inhibited the development of quartz overgrowths and had minimal impact on reservoir quality.
MARINE AND PETROLEUM GEOLOGY
(2024)
Article
Geosciences, Multidisciplinary
Xing Jian, Ping Guan, Ling Fu, Wei Zhang, Xiaotian Shen, Hanjing Fu, Ling Wang
Summary: This study presents a synthesis of new detrital zircon dating results and published data from the Cenozoic Qaidam basin, revealing the spatiotemporal variation of detrital zircon age populations and supporting models of synchronous deformation in northern Tibet. The study emphasizes the importance of considering textural and sedimentological parameters in zircon provenance interpretations, as well as the need for integrated provenance analysis involving other detritus components.
MARINE AND PETROLEUM GEOLOGY
(2024)
Article
Geosciences, Multidisciplinary
A. Peketi, G. Sriram, A. Mazumdar, P. Dewangan, A. Zatale, V. Rajurkar, Gayatri Shirodkar, V. Mahale, V. Yatheesh
Summary: This study investigates 13 submarine seamounts in the southern Andaman volcanic arc and observes evidence of hydrothermal activity in one of the seamounts. The evidence includes plumes rich in dissolved gases, live chemosymbiotic organisms, and the deposition of neoforming minerals. These observations suggest the development of a new hydrothermal field in the least explored Andaman Sea.
MARINE AND PETROLEUM GEOLOGY
(2024)
Article
Geosciences, Multidisciplinary
Yanxian Zhu, Zhiliang He, Xiaowen Guo, Long Li, Sheng He, Jian Gao, Shuangjian Li, Huili Li
Summary: This study investigates the fluid evolution history of the hydrothermal dolomite reservoir in the Middle Permian Maokou Formation in the Sichuan Basin. The results reveal the diagenetic sequences, mineral origins, salinity history, and pressure evolution using various analytical techniques. The findings provide important insights into the gas charge, escape, and preservation conditions of the reservoir.
MARINE AND PETROLEUM GEOLOGY
(2024)
Article
Geosciences, Multidisciplinary
Rafaella de Carvalho Antunes, Julia Campos Guerrero, Ricardo Jorge Jahnert
Summary: This study presents a detailed sedimentary model and identifies various sedimentary facies associations in the coquina deposits of the Itapema Formation in the offshore pre-salt Buzios Field of the Santos Basin. These facies associations were primarily influenced by waves and currents and reflect a complex depositional system.
MARINE AND PETROLEUM GEOLOGY
(2024)
Article
Geosciences, Multidisciplinary
Kang Meng, Tongwei Zhang, Deyong Shao, Xiuyan Liu, Hui Song, Heng Peng
Summary: In this study, an integrated method of measuring optical reflectance and Raman spectroscopy is proposed to accurately determine the thermal maturity of Lower Cambrian shales in South China. The results show that this method is reliable and effective, and it has important implications for analyzing overmature shale.
MARINE AND PETROLEUM GEOLOGY
(2024)
Article
Geosciences, Multidisciplinary
Mohamed A. K. El-Ghali, Olga Shelukhina, Iftikhar Ahmed Abbasi, Mohamed S. H. Moustafa, Osman Salad Hersi, Numair A. Siddiqui, Khalid Al-Ramadan, Abdullah Alqubalee, Abdulwahab Muhammad Bello, Abduljamiu O. Amao
Summary: This study employs an integrated depositional and sequence stratigraphic approach to assess the control of diagenesis on reservoir porosity of a hybrid-energy delta system. The study focuses on the Barik Formation in the Haushi-Huqf region of Central Oman, which represents a highstand system tract of a hybrid-energy delta. The assessments reveal that the reservoir porosity is controlled by various degrees of diagenetic processes, including mechanically infiltrated clays and kaolinitization of silicate grains.
MARINE AND PETROLEUM GEOLOGY
(2024)
Article
Geosciences, Multidisciplinary
Xiaocan Yu, Chunlian Wang, Hua Huang, Kai Yan
Summary: Oilfield brines are a significant alternative lithium resource. This study investigates the metallogenic characteristics and enrichment process of oilfield brines from the Jianghan Basin, central China using chemical and multi-isotope data. The results suggest that lithium enrichment in these brines is the result of interaction with clastic host rocks and dilution by meteoric water.
MARINE AND PETROLEUM GEOLOGY
(2024)
Article
Geosciences, Multidisciplinary
Jianghao Qiao, Xiwu Luan, Thanuja D. Raveendrasinghe, Yintao Lu, Guozhang Fan, Xinyuan Wei, Long Jin, Jian Yin, Haozhe Ma, Lushan Jiang
Summary: This study investigates the Tanintharyi passive continental margin in the Andaman Sea and reveals the potential of the Oligocene/Early Miocene carbonate platform in the region as a significant hydrocarbon reservoir. It also examines the influence of changes in sedimentary facies and the tectonic setting of the Andaman Sea on the evolution of pockmarks.
MARINE AND PETROLEUM GEOLOGY
(2024)
Article
Geosciences, Multidisciplinary
Anastasios Nikitas, Georgios Makrodimitras, Maria V. Triantaphyllou, Nikolaos Pasadakis, Kimon Christanis, Stavros Kalaitzidis, Grigoris Rousakis, Ioannis Panagiotopoulos, Alexandra Gogou, Alexandros Papadopoulos, Efthimios Tartaras, Aristofanis Stefatos
Summary: Due to the lack of deep wells in the broader region, studying mud volcanic deposits can improve the geological understanding of the Mediterranean Ridge. In this study, biostratigraphic and geochemical analyses were performed on mud breccia deposits from five Mud Volcanoes in the central MR. The results indicate the origin of these deposits and provide insights into the source rock potential. Seismic data is also used to determine the distribution of major lithostratigraphic formations.
MARINE AND PETROLEUM GEOLOGY
(2024)