Article
Geosciences, Multidisciplinary
William Helland-Hansen, Sten-Andreas Grundvag
Summary: The study synthesized data from the post early Eocene foreland basin succession in Svalbard to generate an updated depositional model, revealing a foredeep setting governed by flexural loading with high sedimentation rates and uncommon relative sea-level falls. The basin fill had a bipartite structure with shelf and shelf-edge deltas, clinothems, and fans, suggesting a wedge top basin in the mature stage. Time-equivalent deposits were found in other regions, indicating potential southerly diversion of sediment-routing.
Article
Geography, Physical
Euan L. Soutter, Ian A. Kane, Ander Martinez-Donate, Adrian J. Boyce, Jack Stacey, Sebastien Castelltort
Summary: The Eocene-Oligocene transition had a significant impact on the stratigraphic evolution of submarine fans, as indicated by sedimentary and stable isotope data from the Alpine foreland basin.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2022)
Article
Geography, Physical
Jingyu Zhang, Fengcun Xing, Wout Krijgsman, Cheng Zhang, Wei Wei, Lin Chen, Suju Yang, Xiaochen Liu, Yongchao Lu
Summary: The Paleogene sedimentary successions of the Tarim Basin in western China are reconstructed to understand the palaeogeographic evolution and palaeoenvironmental changes. The study reveals the major regression of the proto-Paratethys Sea, the transition from marine to continental-lacustrine sedimentation, and the role of tectonic and eustatic forces in controlling the late Paleogene transgression regression. The findings provide insights into the sedimentary response to Paleogene sea-level change and tectonic events in Central Asia.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2022)
Article
Geosciences, Multidisciplinary
Alexandre Pichat, Guilhem Hoareau, Michel Lopez, Jean-Paul Callot, Jean-Claude Ringenbach
Summary: The E-W oriented Sivas foreland basin in Turkey experienced a salinity crisis during the Late Eocene, leading to thick evaporite accumulations and intense halokinesis during the Oligo-Miocene period. The transition from marine deposits to evaporitic facies across sedimentological sections reveals different sedimentary features in various parts of the basin, reflecting the progressive transition from marine to continental environments.
MARINE AND PETROLEUM GEOLOGY
(2021)
Article
Geography, Physical
Yichao Wang, Huayu Lu, Hengzhi Lyu, Dongxu Cai, Xiaoke Qiang, Yongxiang Li, Xianyan Wang, Wen Lai, Yao Wang, Hanzhi Zhang, Kexin Wang, Zihan Huang, Xiaochun Yu, Shaolei Hu
Summary: During the Eocene-Oligocene transition, there was a significant global cooling event which led to changes in the hydroclimate in Asian monsoon dominated regions. A high-resolution hydroclimate record from central China reveals a shift in sedimentary environment and significant changes in sediment grain size in response to this cooling event and the Early Oligocene Glacial Maximum. The variations in hydroclimate were also influenced by orbital frequencies.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2023)
Article
Ecology
Cassia Bitencourt, Nicolai M. Nuerk, Alessandro Rapini, Mark Fishbein, Andre O. Simes, David J. Middleton, Ulrich Meve, Mary E. Endress, Sigrid Liede-Schumann
Summary: The Apocynaceae family is highly diverse in morphology and ecology, with over 5,350 species found in a wide range of habitats. South America, Africa, and Southeast Asia were identified as potential ancestral areas for the family's diversity, with these tropical regions acting as museums for old lineages. Africa was confirmed as the origin of pollinia-bearing lineages and the main source of intercontinental dispersals. The diversification of Apocynaceae was influenced by morphological innovations that allowed for better dispersal and establishment in various habitats, particularly after the Eocene-Oligocene climate transition.
FRONTIERS IN ECOLOGY AND EVOLUTION
(2021)
Article
Plant Sciences
Valenti Rull
Summary: The author of a recent paper demonstrated that the emergence of Caribbean mangroves occurred in the Eocene period, replacing the primeval mangroves. This shift could be attributed to the cooling during the EOT period, which favored the expansion of the euryclimatic and widely dispersing Rhizophora species.
PERSPECTIVES IN PLANT ECOLOGY EVOLUTION AND SYSTEMATICS
(2023)
Article
Geography, Physical
Yadong Wang, Sihua Yuan, Tao Zhang, Xiaoyan Liu, Yongjiang Liu, Yunfa Miao
Summary: The Eocene/Oligocene transition (EOT) led to a major environmental reorganization from greenhouse to icehouse conditions, with significant changes in sediment characteristics at around 33.8 Ma in the northern part of the NE Tibetan Plateau. Global cooling was speculated to be the main driving force behind these changes.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2021)
Article
Geosciences, Multidisciplinary
Linlin Chen, Weiyudong Deng, Tao Su, Shufeng Li, Zhekun Zhou
Summary: The sclerophyllous evergreen broad-leaved forests in the Hengduan Mountains are mainly composed of sclerophyllous oak trees from the Quercus section Heterobalanus. The distribution and development of these forests are closely associated with the Qinghai-Tibetan Plateau. Research has shown that the origin of these oak trees may be much older than previously believed, dating back to the late Eocene period. The expansion of cooler and drier habitats, along with stabilizing selection, has contributed to the spread and development of this oak tree section through time, contrary to previous hypotheses.
SCIENCE CHINA-EARTH SCIENCES
(2021)
Article
Geosciences, Multidisciplinary
Qian Tian, Xiaomin Fang, Weilin Zhang, Yibo Yang, Tao Zhang
Summary: This study reconstructs the paleoecological and paleohydrological evolution of the Qaidam Basin during the Eocene/Oligocene transition using organic biomarker analyses. The research reveals significant changes in vegetation composition and climate, indicating ecological and hydrological responses to the cooler and drier conditions during this period.
JOURNAL OF ASIAN EARTH SCIENCES
(2022)
Article
Geosciences, Multidisciplinary
Joseph D. McNeil, Amy Gough, Robert Hall, Nils Keno Luensdorf, Max Webb, Sarah Feil
Summary: The study reveals that sediments in the Salin Sub-basin of Myanmar were mainly derived from the metamorphic basement rocks in the northern part, with contributions from a variety of igneous and metamorphic rocks, including some recycled older sediments. The detrital zircons in the sediments predominantly show Cretaceous and Palaeogene ages, likely sourced from the Mogok Metamorphic Belt or the Wuntho-Popa Arc. The presence of Late Cretaceous and Palaeocene zircons suggests input from these geological sources, with a decrease in signal by the end of the Oligocene.
JOURNAL OF ASIAN EARTH SCIENCES
(2021)
Article
Plant Sciences
Cedric Del Rio, Aixa Tosal, Eliise Kara, Steven R. Manchester, Fabiany Herrera, Margaret E. Collinson, Dario De Franceschi
Summary: This study aims to document newly recognized Anacardiaceae fossils from the Paris Basin, understand their paleoecology, and discuss their biogeographic history. Based on the examination of lignite fruits, a new species called Cyrtocarpa biapertura has been described, and a previously known species called Lannea europaea has been reported. The study reveals an enrichment of Anacardiaceae diversity in the early Eocene of the Paris Basin and documents a rare disjunction between the Paleogene of Europe and the recent tropical flora of South America.
INTERNATIONAL JOURNAL OF PLANT SCIENCES
(2023)
Article
Geosciences, Multidisciplinary
Saeedeh Senemari, Farah Jalili
Summary: This study investigated the Eocene to Oligocene palaeoenvironmental conditions in the southwest of Izeh, southwestern Iran using data from calcareous nannofossils. The presence of calcareous nannofossils in the upper part of the Pabdeh Formation indicates lithostratigraphic and biostratigraphic changes from the Priabonian to the Chattian. The findings suggest that environmental changes, possibly due to basin shallowing and a bio-event, influenced the marine phytoplankton sensitivity to climate fluctuations during the late Eocene to late Oligocene.
JOURNAL OF PALAEOGEOGRAPHY-ENGLISH
(2021)
Article
Geochemistry & Geophysics
Mitchell McMillan, Lindsay M. Schoenbohm, Alexander Tye, Malcolm F. McMillan, Renjie Zhou
Summary: Cordilleran orogens in the Central Andes are influenced by lithospheric deformation and exhumation, but little is known about the timing and mechanisms in the high-elevation Puna Plateau. This study provides insights into the history and style of orogenic deformation in the Antofalla region using various methods. The results show a protracted period of shortening during the Eocene and Early Miocene, followed by a transient episode of upper-crustal extension in the Late Miocene. Eastern-western shortening returned in the Pliocene-Quaternary. The structural cross-section reveals a low magnitude of shortening compared to the thick crust. The region experienced little exhumation or sedimentation during the Mesozoic, possibly retaining a thickened crust from Paleozoic orogenesis.
Article
Geography, Physical
Adrian Lopez-Quiros, Carlota Escutia, Johan Etourneau, Francisco J. Rodriguez-Tovar, Sabine Roignant, Francisco J. Lobo, Nick Thompson, Peter K. Bijl, Fernando Bohoyo, Ulrich Salzmann, Dimitris Evangelinos, Ariadna Salabarnada, Frida S. Hoem, Marie-Alexandrine Sicre
Summary: The scarcity of paleo-records from the Antarctic Peninsula region limits our understanding of the opening of Drake Passage, specifically in the area between the South Orkney Microcontinent and Powell Basin. Sediments from the upper Eocene-lower Oligocene at Ocean Drilling Program (ODP) Hole 696B provide insight into paleoceanographic and paleoclimatic changes during the Eocene-Oligocene transition. The study suggests that a shallow gateway, the proto-Powell Basin, formed at -35.5 Ma, leading to long-term deepening interrupted by EOT regression due to continent-wide ice sheet build-up.
GLOBAL AND PLANETARY CHANGE
(2021)
Article
Plant Sciences
Aixa Tosal, Josep Sanjuan, Carles Martin-Closas
REVIEW OF PALAEOBOTANY AND PALYNOLOGY
(2019)
Article
Paleontology
Josep Sanjuan, Ingeborg Soulie-Marsche
Article
Plant Sciences
Josep Sanjuan, Alba Vicente, Jeffrey G. Eaton
REVIEW OF PALAEOBOTANY AND PALYNOLOGY
(2020)
Article
Plant Sciences
Alba Vicente, Josep Sanjuan, Jeffrey G. Eaton, Uxue Villanueva-Amadoz
Article
Geology
Josep Sanjuan, Alba Vicente, Jordi Perez-Cano, Marius Stoica, Carles Martin-Closas
Summary: A study in South Dobrogea sampled eleven boreholes and one outcrop of the Lower Cretaceous, revealing twenty charophyte species and providing new age information. Additionally, it represents the first description of certain Western European and North American charophytes in Eastern Europe.
CRETACEOUS RESEARCH
(2021)
Article
Plant Sciences
Bernard Gomez, Veronique Daviero-Gomez, Clement Coiffard, Abel Barral, Carles Martin-Closas, David L. Dilcher
Article
Geography, Physical
Sha Li, Josep Sanjuan, Qifei Wang, Haichun Zhang, Xiaoqiao Wan
Summary: This study represents the first attempt to correlate the response of the charophyte flora to global climate changes in permanent lacustrine systems during the three main Late Cretaceous-early Danian climatic turnovers, showing distinct changes in charophyte diversity in lake sediments under different climate events.
GLOBAL AND PLANETARY CHANGE
(2021)
Article
Geosciences, Multidisciplinary
Hammad Tariq Janjuhah, Josep Sanjuan, Mohammad Alqudah, Mohamed K. Salah
Summary: Carbonate rocks with prolific hydrocarbon reserves, particularly in the Middle East, were studied in exposed marine sedimentary sequences in Southern Lebanon. The study analyzed the carbonate reservoir facies, diagenetic history, and reservoir quality, with Maghdoucheh dominated by limestone beds in a restricted marine platform environment, and Qennarit composed of mudstone/wackestone limestone beds with planktonic foraminifera related to open marine conditions. The porosity-permeability analysis revealed moderate to good porosity but very low permeability, mainly due to the presence of large isolated moldic pores. Diagenetic features were dominated by micritization and dissolution, with dissolution contributing to porosity enhancement but other factors negatively impacting permeability and overall reservoir quality.
ACTA GEOLOGICA SINICA-ENGLISH EDITION
(2021)
Article
Geology
Jordi Perez-Cano, Telm Bover-Arnal, Carles Martin-Closas
Summary: This study investigates the paleoecology of Barremian charophytes in the non-marine Barremian of the Maestrat Basin in eastern Spain through a combined micropalaeontological, taphonomical and sedimentological study. The results show that the distribution and ecology of charophytes are influenced by environmental factors such as water depth, clastic content, and salinity.
Article
Biology
Josep Sanjuan, Damia Matamoros, Isaac Casanovas-Vilar, Alba Vicente, Josep Anton Moreno-Bedmar, Jonathan Holmes, Carles Martin-Closas
Summary: This article describes, for the first time, a diverse charophyte assemblage from the Valles-Penedes and Vilanova basins in NE Spain during the Middle Miocene. The discovery of these aquatic plants provides insights into the paleoenvironmental conditions in the region during that time period.
HISTORICAL BIOLOGY
(2023)
Article
Plant Sciences
Elvan Demirci, Josep Sanjuan, Atike Nazik, Engin Meric, Zeki Unal Yumun
Summary: This study describes and illustrates a charophyte assemblage found in lower Holocene sediments in the Izmir Gulf, Turkey for the first time. The assemblage consists of well-preserved gyrogonites and oospores of Lamprothamnium papulosum, along with seeds of Ruppia cf. maritima and various ostracod species and benthic foraminiferal taxa. The presence of monospecific L. papulosum assemblages suggests the existence of very shallow, brackish, alkaline, and oligotrophic waters with strong seasonality in the gulf. The availability of freshwater during the early Holocene Climatic Optimum may have played a significant role in the establishment of human settlements in the area.
Article
Geosciences, Multidisciplinary
Mohamed K. K. Salah, Hammad Tariq Janjuhah, Josep Sanjuan
Summary: The carbonate rocks near Sidon, Lebanon have high microporosity and micropore throat dominance, resulting in low mean hydraulic radius and very low permeability. They are likely classified as non-reservoir facies.
JOURNAL OF EARTH SCIENCE
(2023)
Article
Evolutionary Biology
Khaled Trabelsi, Benjamin Sames, Michael Wagreich, Miklos Kazmer, Andrea Mindszenty, Carles Martin-Closas
Summary: A diverse Eocene charophyte flora from Gant in north-western Hungary is studied to revise the taxonomy of Raskyella peckii and propose a new local charophyte biozonation. The study suggests a longer chronostratigraphic interval for the sequences from Gant, indicating a more prolonged and stepwise Eocene major transgression in the Transdanubian Central Range than previously believed.
JOURNAL OF SYSTEMATIC PALAEONTOLOGY
(2021)
Article
Paleontology
Sha Li, Qifei Wang, Haichun Zhang, Xiaoqiao Wan, Carles Martin-Closas
PAPERS IN PALAEONTOLOGY
(2019)