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The Argentina Continental Margin : A Potential Paleoclimatic-Paleoceanographic Archive for the Southern Ocean. (2017)

Violante, Roberto A.

Cham :Springer International Publishing AG,

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Schlagwort(e): Paleontology. ; Electronic books.

Materialart: Online-Ressource

Seiten: 1 online resource (129 pages)

Ausgabe: 1st ed.

ISBN: 9783319041964

Serie: SpringerBriefs in Earth System Sciences Series

URL: https://ebookcentral.proquest.com/lib/geomar/detail.action?docID=4830525

DDC: 551.4680982

Sprache: Englisch

Anmerkung: Intro -- Contents -- Abbreviations -- List of Figures -- List of Tables -- Abstract -- 1 Introduction -- Abstract -- 2 Continental Margins in the Global Context -- Abstract -- References -- 3 The Argentina Continental Margin: Location and Significance -- Abstract -- 3.1 Geotectonic Considerations, Types of Margins and Stratigraphy -- 3.1.1 Brief History of the Margin Evolution in the Context of the Southern Hemisphere -- 3.1.2 Margin Types and Geotectonic Configuration -- 3.1.3 Stratigraphic Evidences of the Margin Evolution -- References -- 4 Morphosedimentary Configuration of the Argentina Continental Margin -- Abstract -- 4.1 Coastal Plains -- 4.2 Continental Shelf -- 4.3 Shelf Break -- 4.4 Slope -- 4.5 Rise -- 4.6 Submarine Canyons -- 4.7 Argentine Basin -- References -- 5 Climate and Oceanographic Background -- Abstract -- 5.1 Regional Climate Background -- 5.1.1 Intertropical Convergence Zone -- 5.1.2 South American Monsoon System -- 5.1.3 Southern Hemisphere Westerlies -- 5.1.4 South Atlantic Convergence Zone -- 5.2 Oceanographic Background -- 5.2.1 The Western South Atlantic and the Meridional Overturning Circulation -- 5.2.2 Western South Atlantic Main Currents -- 5.2.3 Western South Atlantic Hydrographic Structure -- References -- 6 Principles of Paleoceanographic Reconstruction -- Abstract -- 6.1 Paleoceanography and Proxy Data -- 6.2 Climate Proxies -- 6.3 Biological Proxies: Fossils as Paleoceanographic Proxies -- 6.3.1 Foraminiferida -- 6.3.2 Coccolithophorids -- 6.3.3 Dinoflagellates -- 6.3.4 Diatoms -- 6.3.5 Radiolarians -- 6.3.6 Corals -- 6.3.7 Ostracods -- 6.3.8 Mollusks -- 6.4 Biomarkers as Paleoceanographic Proxies -- 6.4.1 Alkenones -- 6.4.2 N-Alkyl-Lipids -- 6.5 Geological Proxies -- 6.5.1 Geomorphology -- 6.5.2 Sedimentary Architecture and Structures -- 6.5.3 Physical Properties -- 6.5.4 Geochemical Properties -- References. , 7 State of the Art in the Paleoceanographic Reconstructions at the Argentina Continental Margin -- Abstract -- 7.1 Reconstructions in the Continental Shelf -- 7.2 Reconstructions in the Slope and Rise -- 7.2.1 Paleoceanographic and Biostratigraphic Background Offshore the Argentina Continental Margin -- 7.2.2 Geomorphological Records -- 7.2.3 Sedimentary Architecture and Structures as Records -- 7.2.4 Physical Proxies -- 7.2.5 Geochemical Proxies -- References -- 8 Conclusions -- Abstract -- Further Readings.

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The Argentina Continental Margin : A Potential Paleoclimatic-Paleoceanographic Archive for the Southern Ocean (2017)

Violante, Roberto A.

Cham : Springer

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Schlagwort(e): Earth sciences ; Paleontology ; Sedimentology ; Oceanography ; Geomorphology ; Earth Sciences ; Argentinien ; Schelfmeer ; Schelf ; Geologie ; Falklandinseln ; Süd-Orkney-Inseln ; Südgeorgien ; Süd-Sandwich-Inseln ; Schelf ; Geologie

Beschreibung / Inhaltsverzeichnis: The evolution of the Argentina Continental Margin during the Quaternary and the stratigraphic and morphosedimentary configuration responded to climatic variability, oceanographic changes, glacioeustatic fluctuations and tectono-isostatic processes, which began to impact on the margin during previous geological periods. The final modeling of the margin was achieved in the late Miocene, when the interaction between the Antarctic and North Atlantic water-masses favored climatic and oceanographic changes with a profound effect on morphosedimentary features. In the Quaternary, the different regions of the margin distinctly responded to such changes. Whereas in the shelf the main modeling factors were the sea-level fluctuations of glacioeustatic origin and consequent marine-continental stratigraphic records, in the slope (particularly in the sector corresponding to the passive margin) the prevailing effect was the interaction between water-masses and the sea floor, giving origin to contouritic depositional systems accompanied of gravity processes responsible of turbiditic and mass-wasting deposits. Different relationships between contouritic and turbiditic facies respond to distinct combinations of oceanic circulation variability and the indirect effect on the sea floor of sea-level fluctuations. As a result of this complexity in the regional processes in the framework of the broad hemispheric oceanographic-climatic conditioning factors, the ACM can be considered as a complete archive for the Southern Ocean

Materialart: Online-Ressource

Seiten: Online-Ressource (XV, 117 p. 15 illus., 13 illus. in color, online resource)

ISBN: 9783319041964

Serie: SpringerBriefs in Earth System Sciences

URL: https://doi.org/10.1007/978-3-319-04196-4

DOI: 10.1007/978-3-319-04196-4

Sprache: Englisch

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IODP workshop: developing scientific drilling proposals for the Argentina Passive Volcanic Continental Margin (APVCM) – basin evolution, deep biosphere, hydrates, sediment dynamics and ocean evolution (2017)

Flood, Roger D. ; Violante, Roberto A. ; Gorgas, Thomas ; [weitere]

Copernicus

In: Scientific Drilling, 22 . pp. 49-61.

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Publikationsdatum: 2017-11-01

Beschreibung: The Argentine margin contains important sedimentological, paleontological and chemical records of regional and local tectonic evolution, sea level, climate evolution and ocean circulation since the opening of the South Atlantic in the Late Jurassic–Early Cretaceous as well as the present-day results of post-depositional chemical and biological alteration. Despite its important location, which underlies the exchange of southern- and northern-sourced water masses, the Argentine margin has not been investigated in detail using scientific drilling techniques, perhaps because the margin has the reputation of being erosional. However, a number of papers published since 2009 have reported new high-resolution and/or multichannel seismic surveys, often combined with multi-beam bathymetric data, which show the common occurrence of layered sediments and prominent sediment drifts on the Argentine and adjacent Uruguayan margins. There has also been significant progress in studying the climatic records in surficial and near-surface sediments recovered in sediment cores from the Argentine margin. Encouraged by these recent results, our 3.5-day IODP (International Ocean Discovery Program) workshop in Buenos Aires (8–11 September 2015) focused on opportunities for scientific drilling on the Atlantic margin of Argentina, which lies beneath a key portion of the global ocean conveyor belt of thermohaline circulation. Significant opportunities exist to study the tectonic evolution, paleoceanography and stratigraphy, sedimentology, and biosphere and geochemistry of this margin.

Materialart: Article , PeerReviewed

Format: text

DOI: 10.5194/sd-22-49-2017

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