Download or read book The Palynological Response to the Toarcian Oceanic Anoxic Event Early Jurassic at Peniche Lusitanian Basin Western Portugal written by V.F. Correia and published by . This book was released on 2017 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Carbon Cycle and Ecosystem Response to the Jenkyns Event in the Early Toarcian Jurassic written by M. Reolid and published by Geological Society of London. This book was released on 2021-11-30 with total page 418 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Toarcian Oceanic Anoxic Event, also known as the Jenkyns Event, was a hyperthermal episode which occurred during the early Toarcian (c. 183 Ma; Early Jurassic) and resulted in numerous collateral effects including global warming, enhanced weathering, sea-level change, carbonate crisis, marine anoxia–dysoxia, and a second-order mass extinction. This volume presents the last advances for understanding early Toarcian environmental changes through different disciplines: biostratigraphy, micropalaeontology, palaeontology, ichnology, palaeoecology, sedimentology, integrated stratigraphy, inorganic, organic and isotopic geochemistry, and cyclostratigraphy. The study of this abrupt climate change is critical for predicting future global changes, and for understanding the complex biogeochemical interactions through time between geosphere, atmosphere, hydrosphere and biosphere.
Download or read book The Toarcian Oceanic Anoxic Event in the South Iberian Palaeomargin written by Matías Reolid and published by Springer. This book was released on 2017-09-05 with total page 127 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the first overview of the Toarcian Oceanic Anoxic Event in the southern Iberian paleomargin, in the western Tethys. The study of catastrophic events that affected the ecosystems in the past is of great interest, because it offers the possibility of establishing models that can be applied to current and future environmental changes. The book provides comprehensive information on the changes in marine ecosystems in connection with a global massive extinction, the Early Toarcian, and with the deposition of black shales, global warming and a disruption of the carbon cycle. In addition, the book describes the incidence of this event in this part of the Tethys close to the connection with the Protoatlantic, the Hispanic Corridor. Special attention is paid to sedimentological and ichnological aspects, fossil content (macroscopic and microscopic), and geochemistry. It also presents the facies changes related to fragmentation of the shelf and the evolution to hemipel agic troughs and swells in this paleomargin. Lastly, it characterizes this anoxic event in under-researched outcrops from southern Spain and compares the findings with those in well-known sections from northern and central Europe. This book offers a unique resource for all researchers interested in the Toarcian Oceanic Anoxic Event, but also in oceanic anoxic events that occurred during the Mesozoic in general, because of their similarity to recent climatic changes.
Download or read book Palaeoenvironmental and Palaeoceanographic Changes During the Lower to Middle Jurassic Toarcian Aalenian 183 171 Ma written by Jorge Ferreira and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: At ~183 Ma when large amounts of organic matter was dumped onto the ocean beds (known as the Toarcian Oceanic Anoxic Event, T-OAE), the Early Toarcian marine biota experienced one of the most important biological crises in Earth history. Calcareous nannoplankton was deeply affected and started only to recover from the end of the Early Toarcian. After the T-OAE, as phytoplankton communities dwelling the oceans photic layer recover from the previous disturbing conditions, the ecological niches once occupied by calcareous nannoplankton are again replenished. Located in the westernmost part of the Tethyan ocean, the Lusitanian Basin acted as a seaway between the NW Tethys and the Mediterranean Tethys provinces, therefore been actively influenced by these two different water masses. Hence such a region stands as the perfect spot to study the calcareous nannoplankton community, as its fossil remains bears species typical of both provinces. In order to appraise the nannoplankton demise and subsequent recovery, absolute and relative abundances of nannofossils were determined from pelagic marl-limestone couplets from three sections of the Lusitanian Basin. Also brachiopods shells were investigated for stable carbon and oxygen isotopes analysis. In order to independently assess the morphologic evolution of Lotharingius coccoliths, a Toarcian section from south France was studied. Different statistic methodologies were used throughout this work, in order to screen for robust and significant information from the numerous datasets that were built.
Download or read book Response of Early Toarcian Early Jurassic Benthic Marine Faunas from South Western Europe to Temperature related Stressors written by Veronica Piazza and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Reconstruction of Local and Global Marine Paleoredox Conditions for the Northeast Panthalassan British Columbia Canada Expression of the Toarcian Oceanic Anoxic Event Using a Multi proxy Approach written by Alexandra Kunert and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The Toarcian Oceanic Anoxic Event (T-OAE) of the Early Jurassic is one of several Mesozoic instances of expanded ocean anoxia, coupled with feedbacks and perturbations in Earth's systems. The drivers for these feedbacks are debated, but the general consensus is that the event is initially rooted in the emplacement of the Karoo-Ferrar large igneous province. The T-OAE is also linked to a second-order mass extinction in the marine and terrestrial realms. Study of the T-OAE aims to provide insight into the causes and consequences of the environmental changes, which may be applicable at present given that some of the characteristics of the T-OAE (e.g. carbon inputs leading to global warming) are reflected in the modern environment. The purpose of this study, which focused on an Early Jurassic section containing the T-OAE in northeastern British Columbia, was to provide extensive insight into the local depositional environment, as well as a glimpse at the global ocean paleoredox conditions across the duration of the event. In northeastern British Columbia, the Early Jurassic is divided into the Gordondale Member and Poker Chip Shale of the lower Fernie Formation. The studied drill core contains both members; the Gordondale is the basal member composed of organic-rich, calcareous mudstone, whereas the overlying Poker Chip shale is a siliceous mudstone to siltstone unit. To provide context for the T-OAE in the study core, organic carbon isotope compositions were profiled in search of a telltale negative carbon isotope excursion (N-CIE) which signals the event zenith. The event was identified by an N-CIE in the uppermost 7 meters of the Gordondale Member below the contact with the Poker Chip Shale. Local paleoenvironmental reconstruction was accomplished using elemental redox sensitive trace metal geochemistry to determine the redox regimes (oxic, suboxic, anoxic or euxinic) and hydrography (open versus restricted) of the depositional basin. The Gordondale Member was characterised as anoxic to euxinic. Elevated Mo and V (up to 370 μg/g and 2757 μg/g, respectively) suggested some intervals were deposited in an euxinic environment. The U and Re concentrations are also elevated in the euxinic intervals (up to 36 μg/g and 878 ng/g, respectively). Intervals with lower Mo and V concentrations ( 53 μg/g and 289 μg/g, respectively) but elevated U and Re content (up to 33 μg/g and 287 ng/g, respectively) indicated anoxic (non-sulfidic) conditions. The Poker Chip Shale was characterised by suboxic conditions (moderate Mo, V, U, and Re concentrations; 21 μg/g, 248 μg/g,
Download or read book An Organic Geochemical and Palynological Investigation of the Toarcian Oceanic Anoxic Event in Lincolnshire written by Vanessa Phan and published by . This book was released on 2016 with total page 69 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Microfossil Response to the Extreme Environmental Changes Associated Witht the Onset of the Toarcian lower Jurassic Oceanic Anoxic Event written by Alice Eileen Kennedy and published by . This book was released on 2015 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Integrated Geochemical and Palynological Investigation of the Toarcian Oceanic Anoxic Event written by Alexander Hudson and published by . This book was released on 2015 with total page 57 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Volcanism Impacts and Mass Extinctions Causes and Effects written by Gerta Keller and published by Geological Society of America. This book was released on 2014-09-16 with total page 468 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Comprises articles stemming from the March 2013 international conference at London's Natural History Museum. Researchers across geological, geophysical, and biological disciplines present key results from research concerning the causes of mass extinction events"--
Download or read book Paleoceanographic changes of the Late Pliensbachian Early Toarcian interval written by T.R. BAILEY and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synchrony between Early Jurassic extinction oceanic anoxic event and the Karoo Ferrar flood basalt volcanism written by J. PALFY and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Carbon Isotope Stratigraphy written by Michael Montenari and published by Academic Press. This book was released on 2020-10-30 with total page 780 pages. Available in PDF, EPUB and Kindle. Book excerpt: Carbon Isotope Stratigraphy, Volume Five in the Advances in Sequence Stratigraphy series, covers research in stratigraphic disciplines, including the most recent developments in the geosciences. This fully commissioned review publication aims to foster and convey progress in stratigraphy with its inclusion of a variety of topics, including Carbon isotope stratigraphy - principles and applications, Interpreting Phanerozoic d13C patterns as periodic glacio-eustatic sequences, Stable carbon isotopes in archaeological plant remains, Review of the Upper Ediacaran-Lower Cambrian Detrital Series in Central and North Iberia: NE Africa as possible Source Area, Calibrating d13C and d18O chemostratigraphic correlations across Cambrian strata of SW, and much more. Contains contributions from leading authorities in the field Informs and updates on all the latest developments in the field Aims to foster and convey progress in stratigraphy, including geochronology, magnetostratigraphy, lithostratigraphy, event-stratigraphy, and more
Download or read book Oceanic Anoxic Event OAE 1b written by Isabel Urbat and published by Sudwestdeutscher Verlag Fur Hochschulschriften AG. This book was released on 2010-05 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Cretaceous OAE 1b is one of the major perturbations of the global carbon cycle. It is documented in Albian deposits from the Atlantic regions as well as in regions of the Western Tethys. High-resolution geochemical profiles show, that the perturbation of the carbon cycle occurred synchronously in the oceanic- and atmospheric carbon reservoirs. This is indicated by the stable isotopic composition of biomarkers for terrestrial higher plant waxes and marine algal lipids. The climate system in the tropics responded with a rapid rise in sea surface temperature (SST). Climate proxies indicate a shift towards more humid climate conditions. The effects of this major perturbation of the climate had also consequences for the biota. At the Mazagan Plateau the organic matter production increased even though the upwelling weakened probably due to an increased influx of nutrients from the adjacent African Continent. The bioproduction of the Vocontian Basin shifted towards bacterial dominated communities. These major perturbations of the carbon cycle had complex effects in different regions of the Lower Albian tropics.
Download or read book Biological and Geological Perspectives of Dinoflagellates written by F. Marret and published by Geological Society of London. This book was released on 2013-12-04 with total page 386 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume provides an overview of current research on fossil and modern dinoflagellates, as well as highlighting research areas for future collaboration, following the DINO9 International Conference in Liverpool. The volume is organized into four themes, with a review paper for each theme written by the key-note speaker. Each theme also includes a future research foci note following discussion during the conference. The contributions are organized into the following sections: environmental change, ecology/palaeoecology, life cycles and diversity, and stratigraphy and evolution. Also included are notes from two workshops: culture experiments and dinocysts as palaeoceanographic tracers. This volume will be of interest to both the biological and micropalaeontological communities.
Download or read book The Micropalaeontology of the Onset of the Toarcian Oceanic Anoxic Event written by Stephen Stukins and published by . This book was released on 2006 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Palynological Studies of Late Jurassic and Early Cretaceous Sediments Perth Basin Western Australia written by John Backhouse and published by . This book was released on 1984 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
