Article
Geography, Physical
C. N. Blok, J. Ineson, K. Anderskouv, A. Fantasia, E. Sheldon, N. Thibault, M. E. Jelby, T. Adatte, S. Bodin
Summary: The study conducted high-resolution clay-mineral assemblage analyses on a cored section in the Danish Central Graben, North Sea, revealing differences in climatic evolution during OAE-1a between the Tethyan and Boreal Realms, indicating a more complex weathering feedback mechanism during hyperthermal events.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2022)
Article
Geography, Physical
C. N. Blok, J. Ineson, K. Anderskouvc, A. Fantasia, E. Sheldon, N. Thibault, M. E. Jelby, T. Adatte, S. Bodin
Summary: This study explores the climatic evolution during the Early Cretaceous in the Boreal Realm of the Danish Central Graben, North Sea. The research findings suggest that there are differences in precipitation patterns between the Tethyan Realm and the Boreal Realm during the OAE-1a period, indicating a more complex weathering feedback mechanism during hyperthermal events than previously assumed.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2022)
Article
Geology
Ying Nie, Xiugen Fu, Hengye Wei, Fei Lin, Shengqiang Zeng, Ahmed Mansour, Gang Zhou, Wenzhi Wang
Summary: High-resolution organic and inorganic geochemical data were used to reconstruct the paleoenvironmental and paleoclimatic conditions during the early Aptian Oceanic Anoxic Event (OAE 1a) in the Gucuo area of southern Tibet. The results showed a shift from oxic to suboxic conditions prior to and at the base of OAE 1a, indicating severe paleoenvironmental disturbance. The analysis of geochemical proxy indicators suggested a warm-humid climate and freshwater-dominated salinity conditions during this period.
CRETACEOUS RESEARCH
(2023)
Article
Geography, Physical
L. M. E. Percival, L. R. Tedeschi, R. A. Creaser, C. Bottini, E. Erba, F. Giraud, H. Svensen, J. Savian, R. Trindade, R. Coccioni, F. Frontalini, L. Jovane, T. A. Mather, H. C. Jenkyns
Summary: The study investigates the role of Large Igneous Province (LIP) activity in triggering the Early Aptian Oceanic Anoxic Event (OAE 1a) and emphasizes the importance of the Greater Ontong-Java Plateau (G-OJP). Globally consistent evidence of LIP activity during OAE 1a is indicated, but geographical variations in mercury trends were observed. The findings suggest that G-OJP emissions of mantle carbon were more likely to have played a major role in initiating OAE 1a than thermogenic volatiles associated with High Arctic LIP (HALIP).
GLOBAL AND PLANETARY CHANGE
(2021)
Article
Environmental Sciences
Gregory T. Connock, Jeremy D. Owens, Xiao-Lei Liu
Summary: Understanding the causal mechanisms of past marine deoxygenation is crucial for predicting the long-term effects of climate change on Earth's systems. In this study, researchers analyzed a comprehensive biomarker inventory from the southern proto-North Atlantic Ocean and identified an abrupt increase in primary productivity preceding Oceanic Anoxic Event 2. This increase in primary productivity destabilized carbon cycling and promoted deoxygenation, highlighting the complex interactions between organic carbon burial and microbial ecological changes.
COMMUNICATIONS EARTH & ENVIRONMENT
(2022)
Article
Geology
Yi Wang, Stephane Bodin, Jerzy S. Blusztajn, Clemens Ullmann, Sune G. Nielsen
Summary: The ongoing oceanic oxygen loss will have a profound impact on the distribution and density of life on Earth. However, drivers of the initiation and termination of global oceanic deoxygenation are poorly understood. New research reveals that in the mid-Cretaceous, there were three rapid global deoxygenation events that occurred after massive volcanism and were influenced by increased continental weathering under a warmer climate. The interactions of long-term climate change and short-term orbital modulation played a role in the termination of each deoxygenation interval.
Article
Geology
Jean-Francois Deconinck, Danny Boue, Francis Amedro, Francois Baudin, Ludovic Bruneau, Emilia Huret, Philippe Landrein, Jean-David Moreau, Anne Lise Santoni
Summary: In 2013, Andra drilled boreholes in the south-east of the Paris Basin to characterise Aptian and Albian clayey formations, revealing information about early Aptian 'Argiles a Plicatules' Formation. Through detailed biostratigraphy, sedimentology, clay mineralogy, and isotope geochemistry analyses, they found evidence of climate change and environmental evolution.
CRETACEOUS RESEARCH
(2021)
Article
Geology
Arman Jafarian, Antun Husinec, Chengshan Wang, Xi Chen, Abdus Saboor, Yalin Li
Summary: This study investigates the Early Aptian Selli Oceanic Anoxic Event 1a (ca 120 Ma) by analyzing sedimentological, biostratigraphic, and carbon isotope data from the Kazhdumi Intrashelf Basin in Kazakhstan. It reveals the biotic, climatic, environmental, and geochemical perturbations associated with the burial of organic matter. The study highlights the significance of shallow carbonate-dominated intrashelf basins in recording carbon isotope and sea-level fluctuations and paleoenvironmental changes during global oceanic disturbances.
Article
Geography, Physical
Victor M. Giraldo-Gomez, Maria Rose Petrizzo, Elisabetta Erba, Cinzia Bottini
Summary: The paleoenvironmental impact of the early Aptian Ocean Anoxic Event 1a (OAE 1a, ca. 121 Ma) has been investigated in detail using various proxies. The study reveals significant changes in bottom and surface waters, driven by increased organic matter flux and intermittent low oxygen conditions. Benthic foraminifera experienced a crisis before OAE 1a, suggesting it is a global event. The OAE 1a was characterized by deep-water anoxia and subsequent repopulation of benthic foraminifera. The post-OAE 1a period was marked by low oxygen conditions and moderate organic matter flux.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2022)
Article
Geography, Physical
Xiangyu Zhang, Shoujun Li, Xuxue Wang, Xiuli Zhao, Tiantao Yin
Summary: This study fills the gap in continental records of the early Aptian Oceanic Anoxic Event 1a(OAE 1a) by analyzing lacustrine facies in the East Asia continental margin. The proposed conceptual model illustrates the response of lake systems to OAE 1a, confirming the occurrence of ancient climate changes and carbon cycle disturbances in lacustrine systems.
GLOBAL AND PLANETARY CHANGE
(2021)
Article
Geosciences, Multidisciplinary
David B. Kemp, Guillaume Suan, Alicia Fantasia, Simin Jin, Wenhan Chen
Summary: In this study, total organic carbon (TOC) data from 67 lower Toarcian sections were compiled to reconstruct the pattern of organic enrichment during the early Toarcian oceanic anoxic event (T-OAE). The findings suggest that redox conditions and sedimentation rates were major controls on organic enrichment and burial rates. Globally, there was a significant increase in TOC at most sites during the T-OAE.
EARTH-SCIENCE REVIEWS
(2022)
Article
Geosciences, Multidisciplinary
Vanessa Londono, Laurel S. Collins
Summary: The study of pelagic sediments from IODP Site U1407 in the western North Atlantic revealed a sequence of organic-lean and organic-rich sediments representing a major global episode of organic matter burial during Oceanic Anoxic Event 2 (OAE2). By analyzing various data sets, researchers were able to reconstruct the paleoceanographic changes during OAE2 and found that marine paleoproductivity was the primary control on the accumulation of OM-rich sediments, while low-oxygen conditions were crucial for their preservation.
Article
Geology
Pedro A. Fernndez-Mendiola, Joanaitz Perez-Malo, Hugh G. Owen, Joaquin Garcia-Mond
Summary: The Aptian sedimentary deposits of the Castro Urdiales area in north Spain record a post-OAE1a episode of disoxia/anoxia. The lower to upper Aptian black lutites and marlstones of the Castro Urdiales area are correlated with other Aptian sections of the Basque-Cantabrian Basin and southeastern France. Prior to the oxygen deficient episode, glauconite-and-ostreid facies were deposited during the Gutiolo volcanic event. The volcanism correlates in part with the Cretaceous superplume eruptions.
CRETACEOUS RESEARCH
(2023)
Article
Environmental Sciences
Zofia Dubicka, Maciej Bojanowski, Danuta Peryt, Marcin Barski
Summary: The study found that an abrupt shift to well-oxygenated oligotrophic conditions led to a collapse of primary productivity in the epicontinental sea ecosystem during the CTBE. This phenomenon was likely associated with anomalous nutrient cycling in Earth's oceans, resulting in significant loss of biologically reactive nitrogen.
GLOBAL BIOGEOCHEMICAL CYCLES
(2021)
Article
Geosciences, Multidisciplinary
Nicte A. Gutierrez-Puente, Ricardo Barragan, Fernando Nunez-Useche, Juan Josue Enciso-Cardenas, Mario Martinez-Yanez, Luis Fernando Camacho-Ortegon
Summary: This study reports the oceanographic and climate conditions during the early Aptian OAE 1a and the late Aptian-early Albian OAE 1b based on the analysis of geochemical data from an organic-rich succession in the Mexican Interior Basin. The results indicate that sediments enriched in organic matter were accumulated under oxygen-depleted and high nutrient conditions, possibly due to a high input of continental-derived nutrients.
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
(2022)
