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Mostrando recursos 1 - 20 de 62.225

  1. (Table 7, page 705) Chemical composition of micronodules and Mn-rich accumulations found inside the rind of a fossil manganese nodule from DSDP Leg 81 (Holes 552A)

    Jehanno, Celestine; Lallier-Verges, Elisabeth; Bonnot-Courtois, Chantal; Desprairies, Alain; Bijon, J; Rivière, Marc

  2. (Table 5, page 705) Chemical composition of layers out from the inner core of a fossil manganese nodule from DSDP Leg 81 (Holes 552A)

    Jehanno, Celestine; Lallier-Verges, Elisabeth; Bonnot-Courtois, Chantal; Desprairies, Alain; Bijon, J; Rivière, Marc

  3. (Table 4, page 704) Chemical composition of zones inside a fossil manganese nodule from DSDP Leg 81 (Holes 552A)

    Jehanno, Celestine; Lallier-Verges, Elisabeth; Bonnot-Courtois, Chantal; Desprairies, Alain; Bijon, J; Rivière, Marc

  4. REE and transition elements concentrations in fossil manganese nodules from DSDP Leg 81 (Holes 552A and 553A)

    Jehanno, Celestine; Lallier-Verges, Elisabeth; Bonnot-Courtois, Chantal; Desprairies, Alain; Bijon, J; Rivière, Marc

  5. Annotated record of the detailed examination of Mn deposits from DSDP Leg 81 (Holes 552A, 553A, 554, 554A)

    Jehanno, Celestine; Lallier-Verges, Elisabeth; Bonnot-Courtois, Chantal; Desprairies, Alain; Bijon, J; Rivière, Marc

  6. Chemical composition of phosphate-ferromanganese crusts and nodules from Malm to the Lower Eocene North Tethys formations of the Briançon area in the French Alps

    Bourbon, Maurice

  7. Observation of phosphate-manganese crusts and nodules from the Briançon area in the French Alps

    Bourbon, Maurice

  8. Annotated record of the detailed examination of Mn deposits from DSDP Leg 84 (Holes 565 and 568)

    von Huene, Roland; Aubouin, Jean
    The Middle America Trench was first drilled in 1979 during Leg 66 off Oaxaca, Mexico and Leg 67 off Guatemala as part of a broad effort to study the mechanics of plate subduction and continental accretion and erosion. Leg 84 was recommended by the JOIDES Advisory Panels specifically to further examine the tectonic and gas-hydrate problems which had been revealed in the previous survey.

  9. Annotated record of the detailed examination of Mn deposits from DSDP Leg 82 (Holes 556, 558, 559, 562, 563, 564)

    Bougault, Henri; Cande, Steven C
    One of the most important geologic discoveries of the 1960s was the remarkable uniformity of the basalts produced at mid-ocean ridges. These basalts have a markedly different tholeiitic composition compared to the alkalic basalts from ocean islands. But very little is known about temporal variations in the composition of basalts derived from one or several mantle sources associated with both normal and anomalously shallow sections of the mid-ocean ridges. The strategy for drilling on DSDP Leg 82 was to set up a broad grid encompassing all possible drilling sites west and southwest of the present Azores Triple Junction in order...

  10. Organic-walled dinoflagellate cyst analysis of sediment core GeoB8331-4 and from surface sediment samples off western South Africa

    Zhao, Xueqin; Dupont, Lydie M; Schefuß, Enno; Bouimetarhan, Ilham; Wefer, Gerold
    Atmospheric and oceanographic interactions between the Atlantic and Indian Oceans influence upwelling in the southern Benguela upwelling system. In order to obtain a better knowledge of paleoceanographic and paleoenvironmental changes in the southern Benguela region during the Holocene, 12 marine surface sediment samples and one gravity core GeoB8331-4 from the Namaqualand mudbelt off the west coast of South Africa have been studied for organic-walled dinoflagellate cysts in high temporal resolution. The results are compared with pollen and geochemical records from the same samples. Our study emphasizes significantly distinct histories in upwelling intensity as well as the influence of fluvial input...

  11. Geochemistry on Mn-nodules from Leg81

    Jehanno, Celestine; Lallier-Verges, Elisabeth; Bonnot-Courtois, Chantal; Desprairies, Alain; Bijon, J; Rivière, Marc
    ree types of concretions were recovered during Leg 81 from Holes 552A, 553A, and 554A, located on the west margin of the Rockall Plateau. In the sedimentary section, these concretions are located at the level of major unconformities, in condensed sequences representing a period from early Eocene to Miocene. This study is a detailed mineralogical and geochemical investigation that permits comparison among the three holes and between the fossil Leg 81 concretions and recent polymetallic nodules found on the ocean floor.

  12. Analysis of Mn-depositis from the Briançon area, France

    Bourbon, Maurice
    This text offers a general introduction to the geological history of the North-Tethys Platform from the Malm to the Lower Eocene periods. It is followed by three parts: a sedimentology development, a geochemical study and a part devoted to the reconstitution of the environment and the sedimentation rates, the subsidence, the depth and the morphology of the seabed and therefore the paleogeography of the Briançonnais domain. The last two chapters deal, one with the evolution of the Briançonnais domain in the context of events affecting Western Tethys and the Central Atlantic, and the other with two sedimentation models deduced from...

  13. Coccolithophore assemblage and palaeoproductivity proxies at sediment core PS75/059-2

    Saavedra-Pellitero, Mariem; Baumann, Karl-Heinz; Ullermann, Johannes; Lamy, Frank
    This work aims to provide new insights into environmental conditions during late Pleistocene Marine Isotope Stage 11 (MIS 11) in the Southern Ocean. We generated a multi-proxy coccolithophore dataset based on sediment core PS75/059-2. This core was retrieved at the western flank of the southern East Pacific Rise crest at ~3600 m water depth. Coccolithophore assemblage counts indicated that the coccolith fraction (CF; <20 µm) during MIS 11 was dominated by Gephyrocapsa caribbeanica and subsequently by small Gephyrocapsa. Coccolith accumulation rates, CF Sr/Ca data and temperature-corrected CF Sr/Ca records were consistent and showed a steep increase in coccolithophore productivity as...

  14. Observation of manganese deposits in the Kane Fractue Zone of the Mid-Atlantic Ridge

    Karson, Jeffrey A; Rona, Peter A
    Seven Alvin dives (14 km total) and numerous deep-towed camera traverses using ANGUS and NOAA camera systems provide dense coverage of a 12-km2 portion of the eastern wall of the Mid-Atlantic Ridge in the TAG area (26°N lat.). These data, in conjunction with recent Soviet Mir submersible data, provide important constraints on the tectonic, magmatic, and hydrothermal history of this spreading center segment. Active hydrothermal venting occurs near the junction of the median valley floor and eastern median valley wall and appears to be tectonically controlled by the intersection of major fault zones. An east-west fault-line scarp interpreted as an...

  15. (Table A10C) Phosphate carbon isotopic measurements in water samples

    Willamowski, Claudia

  16. (Table A10B) Phosphate and trace element concentrations in water samples

    Willamowski, Claudia

  17. (Table A8) Cd/Ca and stable carbon isotopic ratios of benthic foraminifera from the Channel surface sediments

    Willamowski, Claudia

  18. (Table A7) Cd/Ca and stable carbon isotopic ratios of benthic foraminifera from North Atlantic surface sediments

    Willamowski, Claudia

  19. (Table A5) Stable isotope and Cd/Ca ratios of benthic foraminifera of sediment core SO82_5-2

    Willamowski, Claudia

  20. (Table A4) Stable isotope and Cd/Ca ratios of benthic foraminifera of sediment core GIK23414-9

    Willamowski, Claudia

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