Sökning: "coccoliths"

Hittade 4 uppsatser innehållade ordet coccoliths.

  1. 1. Lateral variability in the quantification of calcareous nannofossils in the Upper Triassic, Austria

    Kandidat-uppsats, Lunds universitet/Geologiska institutionen

    Författare :Andreas Fägersten; [2018]
    Nyckelord :Calcareous nannofossils; Upper Triassic; Steinbergkogel; lateral variability; limestone; Earth and Environmental Sciences;

    Sammanfattning : Calcareous nannofossils are microscopic remains of organisms that diversified considerably in and after the Late Triassic, and which may have influenced seawater chemistry and carbonate production. Coccoliths, nannoliths, and calcareous dinoflagellate cysts are important parts of many calcareous nannofossil assemblages in the Upper Triassic. LÄS MER

  3. 2. Size and Abundance of Late Pleistocene Reticulofenestrid Coccoliths from the Eastern Indian Ocean in Relation to Temperature and Aridity

    Master-uppsats, Uppsala universitet/Institutionen för geovetenskaper

    Författare :Jeroen van Dijk; [2017]
    Nyckelord :coccoliths; abundance; biometry; circular polarized light microscopy; Late Pleistocene; Marine Isotope Stage 11; kokkoliter; mängder; biometri; cirkulär polariserat ljus; pleistocen; Marine Isotope Stage 11;

    Sammanfattning : Measurements on coccolith abundance and mass can be used as a signal of primary productivity and pelagic calcification in response to environmental change. The Leeuwin Current (LC) is known to transport warm and low-salinity waters from the Indo-Pacific Warm Pool (IPWP) southwards along the coast of West Australia. LÄS MER

  4. 3. Response of Phytoplankton to Climatic Changes during the Eocene-Oligocene Transition at the North Atlantic ODP Site 612

    Master-uppsats, Uppsala universitet/Institutionen för geovetenskaper

    Författare :Lucía Rivero Cuesta; [2015]
    Nyckelord :Phytoplankton; abundance; coccoliths; silica; Eocene; Oligocene; Fytoplankton; antal; coccoliter; kisel; Eocen; Oligocen; Fitoplancton; abundancia; cocolitos; sílice; Eoceno; Oligoceno;

    Sammanfattning : The development of modern glacial climates occurred during the Eocene-Oligocene transition (34 to 35.5 Ma) when a decrease of atmospheric CO2 led to a global temperature fall. The ocean was deeply affected, both in the surface and the deep-sea, suffering a strong reorganization including currents and phytoplankton distribution. LÄS MER

  5. 4. A Light Microscopy and Scanning Electron Microscopy study of coccoliths from two bore holes along the City Tunnel Line in Malmö, Sweden

    Magister-uppsats, Lunds universitet/Geologiska institutionen

    Författare :Jenny Book; [1996]
    Nyckelord :Light Microscopy; Scanning Electron Microscopy; coccoliths; stratigraphy; hammer drilling; core drilling; Danian; Tertiary; City Tunnel Line; Malmö; Sweden; Earth and Environmental Sciences;

    Sammanfattning : Samples from the Danian were prepared for study of coccoliths, on one hand with Light Microscopy, on the other hand with Scanning Electron Microscopy to test the different advantages and disadvantages of these methods. Light Microscopy studies can be used for quantitative investigations and Scanning Electron Microscopy studies for quantitative and qualitative investigations of coccoliths. LÄS MER