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PANGAEA - Publishing Network for Geoscientific & Environmental Data (847.310 recursos)

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Datasets with PANGAEA technical keyword @ORFOIS

Mostrando recursos 1 - 20 de 5.115

  1. Sedimentology of cores off Kapp Norvegia, Antarctica

    Vernaleken, Jutta
    Anhand von sedimentologischen Untersuchungen an den Sedimentkernen PS2819 und PS2820 vom antarktischen Kontinentalhang im Bereich von Kapp Norvegia wurden spätquartäre Sedimentationsprozesse rekonstruiert. Die Kerne wurden lithologisch beschrieben und in regelmäßigen Abständen beprobt. Aus jedem Probenhorizont wurde der Wassergehalt, Corg, Karbonat, Dichte und Opal bestimmt, sowie tonmineralogische Untersuchungen und Analysen zur Korngrößenverteilung durchgeführt. Aus der Sandfraktion wurden linksgewundene planktische Foraminiferen der Art Neogloboquadrina pachyderma für die Messung stabiler Sauerstoff- und Kohlenstoffisotope ausgelesen. Mittels der sedimentologischen Parameter wurde eine Klassifizierung der Sedimente in verschiedene Sedimentfazies vorgenommen, die durch signifikante lithologische Variationen und bnderungen in der Sedimentstruktur bestimmt wurden. Die Faziestypen, welche die glazialen...

  2. Sedimentology and age models of sediments from the Indian Ocean

    Sirocko, Frank
    Die Entwicklung des sommerlichen SW-Monsun im Arabischen Meer während der letzten 27,000 Jahre zeigt drei klimatisch stabile Zeitabschnitte: 0-4000 J.v.h., 6000-12,000 J.v.h. und 15,000-27,000 J.v.h.. Phasen großräumiger Änderungen in der Lage des SW-Monsuns fallen in die Zeiten vor 4000-6000 J.v.h. und 12,000-15,000 J.v.h.. Diese Alter wurden über Sauerstoffisotopenstratigraphie an Planktonforaminiferen und 14C-Datierungen bestimmt. Darauf aufbauend und mit Hilfe der sedimentphysikalischen Eigenschaften wurden die Gesamtakkumulationsraten der hemipelagischen Sedimente insgesamt und der einzelnen marinen und lithogenen Sedimentkomponenten bestimmt, besonders die Akkumulationsraten des lithogenen und marinen Karbonats, des Biogen-Opals, der siliziklastischen Korngrößenfraktionen und der Tonminerale. Insgesamt wurden nach dieser Methode die ungestörten, turbiditfreien Profilabschnitte...

  3. Sedimentological analysis of sediments from Amundsen and Bellingshausen Seas, Southern Ocean

    Hillenbrand, Claus-Dieter
    Glaciomarine deposits at the Antarctic continental margin represent an important paleoglaciological and paleoceanographical record of environmental changes in both Antarctica and the adjacent Southern Ocean. In order to reconstruct the climatic-controlled sedimentation history in the Amundsen and Bellingshausen Seas during Quaternary glacial cycles, sedimentological, geochemical and clay mineralogical investigations were carried out on 34 surface sediment samples and On 7 sediment cores. The study of the surface sediment samples allows one to decipher the recent sediment supply and transportation processes. The input of glacial debris is highest in the eastern Bellingshausen Sea because of the subpolar climatic conditions prevailing over...

  4. Sedimentology of sites 14-141, 41-366, 47-397 and 79-544B

    Stein, Ruediger
    Along the N-S-transect of DSDP-Sites 5446, 397, 141, and 366, oxygen and carbon isotopes, flux rates of calcium carbonate, terrigenous matter, and biogenic opal, clay minerals and the size distribution of terrigenous partictes were determined in order to assess the ties between atmospheric and oceanic surface and deep-water circulation off northwest Africa during the late Neogene. During the last 9 m.y., both the paleoceanography in the eastern Atlantic and west African paleodimates were intimately correlated with the evolution of the polar ice sheets as reflected in the benthos d18O curves of the 4 DSDP-Sites. These records make it possible to distinguish...

  5. Sedimentology on cores off the South Orkney Plateau

    Grünig, Sigrun
    Grab samples and cores for sedimentological studies were retrieved along a N-S transect of the South Orkney Plateau margin. On the basis of morphology, the margin has been subdivided into shelf, upper continental slope, and a lower slope region cut by basins and ridges. Grain size, Sand component, and clay mineralogy were determined as well as water, organic carbon and carbonate contents. In addition, vane shear strength, magnetic intensity and the proportion of ice-rafted debris were measured, dating was done by detailed magnetic stratigraphy, the biofluctuation of the radiolarian Cycladophora davisiana and 230-Thorium analyses. Sediment facies distribution is controlled by numerous factors...

  6. Compilation of the results of EU-project BOFS

    Lowry, Roy K; Machin, P

  7. Compilation of scientific results of the EU project BENGAL

    Pfannkuche, Olaf; Rabouille, Christophe; Bassinot, Franck C; Galeron, Joelle; Rice, Anthony L; Bett, Brian J; Vangriesheim, Annick; Hall, Per; Brey, Thomas; Christiansen, Bernd; Springer, Barbara; Ragueneau, Olivier; Gooday, Andrew J; Wolff, George A; Grandel, Sibylle; Vanreusel, Ann; Lampitt, Richard Stephen; Duineveld, Gerard C A; Reyss, Jean-Louis; Megalovasilis, Pavlos; Dell'Anno, Antonio; Varnavas, Soterios; Grehan, Anthony J; Patching, John W; Roberts, Dai; Lamont, Peter; Danovaro, Roberto; Kiriakoulakis, Kostas; Turnewitsch, Robert; Witbaard, Rob; Cosson-Sarradin, Nathalie; Priede, Imants G; Popova, E E

  8. Compilation of scientific results of the EU project BENGAL

    Pfannkuche, Olaf; Rabouille, Christophe; Bassinot, Franck C; Galeron, Joelle; Rice, Anthony L; Bett, Brian J; Vangriesheim, Annick; Hall, Per; Brey, Thomas; Christiansen, Bernd; Springer, Barbara; Ragueneau, Olivier; Gooday, Andrew J; Wolff, George A; Grandel, Sibylle; Vanreusel, Ann; Lampitt, Richard Stephen; Duineveld, Gerard C A; Reyss, Jean-Louis; Megalovasilis, Pavlos; Dell'Anno, Antonio; Varnavas, Soterios; Grehan, Anthony J; Patching, John W; Roberts, Dai; Lamont, Peter; Danovaro, Roberto; Kiriakoulakis, Kostas; Turnewitsch, Robert; Witbaard, Rob; Cosson-Sarradin, Nathalie; Priede, Imants G; Popova, E E

  9. Compilation of scientific results of the EU project BENGAL

    Pfannkuche, Olaf; Rabouille, Christophe; Bassinot, Franck C; Galeron, Joelle; Rice, Anthony L; Bett, Brian J; Vangriesheim, Annick; Hall, Per; Brey, Thomas; Christiansen, Bernd; Springer, Barbara; Ragueneau, Olivier; Gooday, Andrew J; Wolff, George A; Grandel, Sibylle; Vanreusel, Ann; Lampitt, Richard Stephen; Duineveld, Gerard C A; Reyss, Jean-Louis; Megalovasilis, Pavlos; Dell'Anno, Antonio; Varnavas, Soterios; Grehan, Anthony J; Patching, John W; Roberts, Dai; Lamont, Peter; Danovaro, Roberto; Kiriakoulakis, Kostas; Turnewitsch, Robert; Witbaard, Rob; Cosson-Sarradin, Nathalie; Priede, Imants G; Popova, E E

  10. Compilation of sedimentation rates and smear slide analysis of DSDP sites

    Thiede, Jörn; Ehrmann, Werner
    A history of Mesozoie and Cenozoic palaeoenvironments of the North Atlantie Oeean has been developed based on a detailed analysis of the temporal and spatial distribution of major pelagie sediment facies, of hiatuses. of bulk sediment accumulation rates, and of concentrations and fluxes of the main deep-sea sediment components. The depositional history of the North Atlantic can be subdivided into three major phase: (a) Late Jurassie and Early Cretaceous phase: clastic terrigenous and biogenic pelagic sediment components accumulated rapidly under highly productive surface water masses over the entire occan basin; (b) Late Cretaceous to Early Miocene phase: relatively little terrigenous...

  11. Compilation of sedimentation rates and smear slide analysis of DSDP sites

    Thiede, Jörn; Ehrmann, Werner
    A history of Mesozoie and Cenozoic palaeoenvironments of the North Atlantie Oeean has been developed based on a detailed analysis of the temporal and spatial distribution of major pelagie sediment facies, of hiatuses. of bulk sediment accumulation rates, and of concentrations and fluxes of the main deep-sea sediment components. The depositional history of the North Atlantic can be subdivided into three major phase: (a) Late Jurassie and Early Cretaceous phase: clastic terrigenous and biogenic pelagic sediment components accumulated rapidly under highly productive surface water masses over the entire occan basin; (b) Late Cretaceous to Early Miocene phase: relatively little terrigenous...

  12. Alkenone analyses of sediment cores from the western Arabian Sea

    Budziak, Dörte
    Records of total organic carbon (TOC) and C37 alkenones were used as indicators for past primary productivity in the western and eastern Arabian Sea. Data from GeoB 3005, an open ocean site in the western Arabian Sea upwelling area, are compared with similar records of GeoB 3007 from the Owen Ridge, Ocean Drilling Program (ODP) Site 723 from the continental margin off Oman and MD 900963 from the eastern Arabian Sea. TOC/C37 alkenone records together with other proxies used to reconstruct upwelling intensity, indicate periods of high productivity in tune with precessional forcing all over the Arabian Sea. Based on...

  13. Alkenone analyses of sediment cores from the western Arabian Sea

    Budziak, Dörte
    Records of total organic carbon (TOC) and C37 alkenones were used as indicators for past primary productivity in the western and eastern Arabian Sea. Data from GeoB 3005, an open ocean site in the western Arabian Sea upwelling area, are compared with similar records of GeoB 3007 from the Owen Ridge, Ocean Drilling Program (ODP) Site 723 from the continental margin off Oman and MD 900963 from the eastern Arabian Sea. TOC/C37 alkenone records together with other proxies used to reconstruct upwelling intensity, indicate periods of high productivity in tune with precessional forcing all over the Arabian Sea. Based on...

  14. Stable isotopes of foraminifers, mineralogy and ages of sediment core GeoB1523-1

    Rühlemann, Carsten; Diekmann, Bernhard; Mulitza, Stefan; Frank, Martin
    Today the western tropical Atlantic is the most important passage for cross-equatorial transfer of heat in the form of warm surface water flowing from the South into the North Atlantic. Circulation changes north of South America may thus have influenced the global thermohaline circulation system and high northern latitude climate. Here we reconstruct late Quaternary variations of western equatorial Atlantic surface circulation and Amazon lowland climate obtained from a multiproxy sediment record from Ceará Rise. Variations in the illite/smectite ratio suggest drier climatic conditions in the Amazon Basin during glacials relative to interglacials. The 230Thex-normalized fluxes and the 13C/12C record...

  15. Stable isotopes of foraminifers, mineralogy and ages of sediment core GeoB1523-1

    Rühlemann, Carsten; Diekmann, Bernhard; Mulitza, Stefan; Frank, Martin
    Today the western tropical Atlantic is the most important passage for cross-equatorial transfer of heat in the form of warm surface water flowing from the South into the North Atlantic. Circulation changes north of South America may thus have influenced the global thermohaline circulation system and high northern latitude climate. Here we reconstruct late Quaternary variations of western equatorial Atlantic surface circulation and Amazon lowland climate obtained from a multiproxy sediment record from Ceará Rise. Variations in the illite/smectite ratio suggest drier climatic conditions in the Amazon Basin during glacials relative to interglacials. The 230Thex-normalized fluxes and the 13C/12C record...

  16. Vertical flux and lithologic material in the Ross Sea

    Collier, Robert W; Dymond, Jack R; Honjo, Susumu; Manganini, Steven J; Francois, Roger; Dunbar, Robert G
    As part of the USJGOFS-AESOPS program, we deployed an array of moored sediment traps and determined the composition and vertical flux of particulate matter through the water column of the continental shelf environment of the Ross Sea. We deployed two moorings, with two traps each. One mooring was located in the southcentral Ross Sea along the line of AESOPS process studies; the other mooring was located in the northcentral Ross Sea. The flux in the southern Ross Sea was generally double that in the north, and there was a significant increase in flux into the deep traps indicating horizontal transport...

  17. Vertical flux and lithologic material in the Ross Sea

    Collier, Robert W; Dymond, Jack R; Honjo, Susumu; Manganini, Steven J; Francois, Roger; Dunbar, Robert G
    As part of the USJGOFS-AESOPS program, we deployed an array of moored sediment traps and determined the composition and vertical flux of particulate matter through the water column of the continental shelf environment of the Ross Sea. We deployed two moorings, with two traps each. One mooring was located in the southcentral Ross Sea along the line of AESOPS process studies; the other mooring was located in the northcentral Ross Sea. The flux in the southern Ross Sea was generally double that in the north, and there was a significant increase in flux into the deep traps indicating horizontal transport...

  18. Geochemistry, fluxes and nitrogen isotopic composition data of traps LP1 and EBC2-1 and cores GeoB4242-4 and Geo4301-1

    Freudenthal, Tim; Neuer, Susanne; Meggers, Helge; Davenport, Robert; Wefer, Gerold
    We compare total and biogenic particle fluxes and stable nitrogen isotope ratios (d15N) at three mooring sites along a productivity gradient in the Canary Islands region with surface sediment accumulation rates and sedimentary d15N. Higher particle fluxes and sediment accumulation rates, and lower d15N were observed in the upwelling influenced eastern boundary region (EBC) compared to the oligotrophic sites north of Gran Canaria [European Station for Time-Series in the Ocean, Canary Islands (ESTOC]] and north of La Palma (LP). The impact of organic matter degradation and lateral particle advection on sediment accumulation was quantified with respect to the multi-year flux...

  19. Geochemistry, fluxes and nitrogen isotopic composition data of traps LP1 and EBC2-1 and cores GeoB4242-4 and Geo4301-1

    Freudenthal, Tim; Neuer, Susanne; Meggers, Helge; Davenport, Robert; Wefer, Gerold
    We compare total and biogenic particle fluxes and stable nitrogen isotope ratios (d15N) at three mooring sites along a productivity gradient in the Canary Islands region with surface sediment accumulation rates and sedimentary d15N. Higher particle fluxes and sediment accumulation rates, and lower d15N were observed in the upwelling influenced eastern boundary region (EBC) compared to the oligotrophic sites north of Gran Canaria [European Station for Time-Series in the Ocean, Canary Islands (ESTOC]] and north of La Palma (LP). The impact of organic matter degradation and lateral particle advection on sediment accumulation was quantified with respect to the multi-year flux...

  20. Geochemistry and soil characteristics of sediment core GeoB4234

    Freudenthal, Tim; Wagner, Thomas; Wenzhöfer, Frank; Zabel, Matthias; Wefer, Gerold
    Stable isotopes of sedimentary nitrogen and organic carbon are widely used as proxy variables for biogeochemical parameters and processes in the water column. In order to investigate alterations of the primary isotopic signal by sedimentary diagenetic processes, we determined concentrations and isotopic compositions of inorganic nitrogen (IN), organic nitrogen (ON), total nitrogen (TN), and total organic carbon (TOC) on one short core recovered from sediments of the eastern subtropical Atlantic, between the Canary Islands and the Moroccan coast. Changes with depth in concentration and isotopic composition of the different fractions were related to early diagenetic conditions indicated by pore water...

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