Search results for " oceanic anoxic event"

showing 4 items of 4 documents

High-resolution clay mineralogy as a proxy for orbital tuning: example of the Hauterivian-Barremian transition in the Betic Cordillera (SE Spain).

2012

11 pages; International audience; The response of clay mineral assemblages to potential orbital forcing is tested in Mesozoic hemipelagic marl- limestone rhythmites of the Río Argos section (Betic Cordillera, Southeastern Spain). Along the section, marls are pervasively enriched in kaolinite and illite, whereas limestones are enriched in smectite-rich illite/smectite mixed-layers, suggesting that marl-limestone alternations are produced by cyclic high-frequency fluctuations of continental runoff. Spectral analyses show that clay mineral assemblages evolve accordingly to precession, obliquity and eccentricity cycles. Durations of ammonite zones are assessed at 535 kyr for the Late Hauterivia…

010506 paleontologyOrbital forcingStratigraphyCyclostratigraphyengineering.material010502 geochemistry & geophysics[ SDU.STU.ST ] Sciences of the Universe [physics]/Earth Sciences/StratigraphyPalaeoclimate01 natural sciencesPaleontologyGeologic time scaleHauterivianMarl0105 earth and related environmental sciencesRhythmiteGeologyCyclostratigraphyFaraoni Oceanic Anoxic EventCretaceousClay minerals13. Climate action[SDU.STU.ST]Sciences of the Universe [physics]/Earth Sciences/StratigraphyIlliteengineeringSedimentary rockBarremianGeology
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Carbon-isotope records of the Early Jurassic (Toarcian) Oceanix Anixic Event from the Valdorbia (Umbria-Marche Apennines) and Monte Mangart (Julian A…

2009

The Toarcian oceanic anoxic event (ca 183 Ma) coincides with a global perturbation marked by enhanced organic carbon burial and a general decrease in calcium carbonate production, probably triggered by changes in the composition of marine plankton and elevated carbon dioxide levels in the atmosphere. This study is based on high-resolution sampling of two stratigraphic successions, located in Valdorbia (Umbria-Marche Apennines) and Monte Mangart (Julian Alps), Italy, which represent expressions of the Toarcian oceanic anoxic event in deep-water pelagic sediments. These successions are characterized by the occurrence of black shales showing relatively low total organic carbon concentrations (…

010506 paleontologystratigraphic correlationStratigraphy[SDU.STU]Sciences of the Universe [physics]/Earth SciencesBiostratigraphy010502 geochemistry & geophysics01 natural sciencesPaleontologyCarbon isotopes cyclostratigraphy Early Jurassic oceanic anoxic event stratigraphic correlation.oceanic anoxic event14. Life underwateroceanic anoxiceventComputingMilieux_MISCELLANEOUS0105 earth and related environmental sciencesCarbon isotopes; cyclostratigraphy; Early Jurassic; oceanic anoxic event; stratigraphic correlationCarbon isotopes; cyclostratigraphy; Early Jurassic; oceanic anoxicevent; stratigraphic correlation.AmmoniteCarbon dioxide in Earth's atmosphereEarly JurassicCarbon isotopesGeologyPelagic sedimentCyclostratigraphyAnoxic waterslanguage.human_languageSettore GEO/08 - Geochimica E Vulcanologia13. Climate actionIsotopes of carbonlanguageSedimentary rockcyclostratigraphyGeology
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THE EARLY TOARCIAN ANOXIC EVENT IN THE TETHYAN DOMAIN: USE OF HIGH-RESOLUTION GEOCHEMICAL RECORDS FOR PALAEOCEANOGRAPHIC RECONSTRUCTIONS

2007

Early Toarcian Oceanic Anoxic Event
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Ichnological analysis at the Fonte Coberta section (Lusitanian Basin, Portugal): Approaching depositional environment during the Toarcian oceanic ano…

2018

Ichnological analysis at the Fonte Coberta section (Lusitanian Basin Portugal): Approaching depositional environment during the Toarcian oceanic anoxic event (T-OAE) ArtículoUNESCO::CIENCIES DE LA VIDAApproaching depositional environment during the Toarcian oceanic anoxic event (T-OAE) Artículo [Ichnological analysis at the Fonte Coberta section (Lusitanian Basin Portugal)]:CIENCIES DE LA VIDA [UNESCO]
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