Results 111 to 120 of about 1,662,610 (136)

The Mafic Volcanic Climax of the Paraná‐Etendeka Large Igneous Province as the Trigger of the Weissert Event

Terra Nova, 2022
The association between Large Igneous Provinces (LIPs) and mass extinctions and anoxic events is attributed to the radical climatic changes in Earth. Even though the Early Cretaceous Paraná–Etendeka Igneous Province has a comparable erupted volume (>1 ...
Richard E. Ernst, Breno L Waichel
exaly   +4 more sources

The Mid-Valanginian Weissert Event as Recorded by Calcareous Nannoplankton in the Vocontian Basin

Palaeogeography, Palaeoclimatology, Palaeoecology, 2014
International audienceThe mid-Valanginian Weissert Event represents one of the most significant paleoceanographic events of the Early Cretaceous and is characterized by a major perturbation of the carbon cycle testified by a positive carbon isotope shift,
Laurent Riquier, Vincent Grossi, Bernard Pittet   +2 more
exaly   +5 more sources

Bottom Water Redox Dynamics During the Early Cretaceous Weissert Event in ODP Hole 692B (Weddell Sea, Antarctica) Reconstructed From the Benthic Foraminiferal Assemblages

Palaeogeography, Palaeoclimatology, Palaeoecology, 2022
Benthic foraminifera at Ocean Drilling Program (ODP) Hole 692B were studied to understand variations in oxygen and organic-matter fluxes in bottom waters during the Early Cretaceous.
Elisabetta Erba, Víctor M Giraldo-Gomez
exaly   +3 more sources

Astrochronology of the Valanginian–Hauterivian Stages (Early Cretaceous): Chronological Relationships Between the Paraná–Etendeka Large Igneous Province and the Weissert and the Faraoni Events

Global and Planetary Change, 2015
16 pagesInternational audienceThe Geological Time Scale shows large uncertainties on durations and ages of Berriasian to Albian stages (Early Cretaceous), which impact climate and paleoceanographic reconstructions.
Laurent Riquier, Pierre Pellenard, Miguel Company   +2 more
exaly   +5 more sources

Climate and Paleoceanography Controlled Size Variations of Calcareous Nannofossils During the Valanginian Weissert Event (Early Cretaceous)

Marine Micropaleontology, 2020
Abstract Strata of Valanginian age (Early Cretaceous, 139.8–132.9 Ma) record a 1.5‰ positive carbon isotope excursion (CIE), the Weissert Event. It coincides with volcanic activity of the Parana-Etendeka large igneous province. Unlike the Mesozoic Oceanic Anoxic Events (OAEs), no organic-rich deposits documenting widespread perturbation of the marine
Jorg Mutterlose, André Bornemann
exaly   +2 more sources

Paleoenvironments and Stratigraphy of the Valanginian–Hauterivian Carbonates of the Arabian Platform: Implications for the Recognition of the Weissert Event on the Southern Tethys

Cretaceous Research, 2023
Matthieu Deville de Periere, Patrice Brenac, Ibrahim Hilali, Feng Lu, Waheed Albasrawi   +4 more
exaly   +2 more sources

Updated Geochemical Insights on the Weissert and Faraoni Events in the Southern Tethyan Margin (Northern Tunisia)

Arabian Journal of Geosciences, 2021
Within the Valanginian–Hauterivian series of the northern Tethyan margin, two organic-rich laminated black shale intervals corresponding to the Valanginian Weissert and the late Hauterivian Faraoni oceanic anoxic events (W-OAE and F-OAE, respectively) are well documented.
Sabrine Ben Ammar, Mohsen Layeb
exaly   +2 more sources

Valanginian Weissert Oceanic Anoxic Event

Geology, 2004
Biotic changes in nannofossils and radiolarians associated with the Valanginian δ 1 3 C anomaly are documented at Ocean Drilling Program Hole 1149B in the Pacific Ocean: they are coeval and similar to those previously documented in the Tethys, suggesting a global perturbation of marine ecosystems.
Elisabetta Erba, Annachiara Bartolini, Roger L Larson   +2 more
exaly   +3 more sources

Astrochronology of the Valanginian Stage From Reference Sections (Vocontian Basin, France) and Palaeoenvironmental Implications for the Weissert Event

Palaeogeography, Palaeoclimatology, Palaeoecology, 2013
Abstract High-resolution gamma-ray measurements performed on five biostratigraphically well-dated reference sections from the Vocontian Basin (south-eastern France) are used to develop a new astrochronology of the Valanginian Stage and its subdivisions (i.e. ammonite and calcareous nannofossil zones and subzones).
Laurent Riquier, Pierre Pellenard, Stéphane Reboulet   +2 more
exaly   +4 more sources

Integrated Isotope and Biostratigraphy of a Lower Cretaceous Section From the Bakony Mountains (Transdanubian Range, Hungary): A New Tethyan Record of the Weissert Event

Cretaceous Research, 2010
Abstract An integrated stratigraphic subdivision, on the basis of ammonites, belemnites, calpionellids and stable isotope ratios is proposed for the Lower Cretaceous carbonate succession of the Harskut, Kozoskut Ravine profile (HK-12), (Bakony Mts, Hungary).
József Pálfy, Gregory D. Price, István Főzy   +2 more
exaly   +2 more sources