Search for dissertations about: "Historisk geologi"

Showing result 1 - 5 of 38 swedish dissertations containing the words Historisk geologi.

  2. 1. Geochronology of the Oklo and Bangombé fossil natural fission reactors : tracing the effects of geological events

    Author : Lena Zetterström Evins; Ian Williams; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Historisk geologi; Geology; geologi; geokemi; Geochemistry;

    Abstract : Thesis to be publicly defended for the degree of Doctor of Philosophy, in lecture room De Geersalen, Svante Arrhenius väg 8a, Stockholm, Friday February 1, 2002 at 10.00 am. Two billion years ago, natural fission reactions took place in the Oklo and Bangombé uranium ores in Gabon, West Equatorial Africa. READ MORE

  4. 2. Late Eocene through Oligocene calcareous nannofossils from the paleo-equatorial Pacific Ocean – taxonomy, preservation history, biochronology and evolution

    Author : Teodora Blaj; Jan Backman; Jorijntje Henderiks; Isabella Raffi; Paul Bown; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; marine sediments; calcareous nannofossils; late Eocene; Oligocene; biochronology; evolution; morphometry; taxonomy; ODP Leg 199 Site 1218; paleo-equatorial Pacific Ocean; Historical geology and palaeontology; Historisk geologi och paleontologi; Marine Geoscience; marin geovetenskap;

    Abstract : This study aims to unravel the ecological and evolutionary dynamics within the calcareous nannofossil communities at the Eocene/Oligocene (E/O) transition and during the Oligocene time when Cenozoic 'icehouse' conditions were established. The main question this study aims to answer is whether the changes in the nannofossil assemblages were controlled by intrinsic evolutionary trends or if the changes were controlled by environmental factors such as changes in temperature and nutrient availability in the surface water. READ MORE

  5. 3. Mapping the Arctic Ocean : bathymetry and pleistocene paleoceanography

    Author : Martin Jakobsson; Anders Elverhøj; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Oceanografi; allmän och historisk geologi; General and Historical Geology;

    Abstract : .... READ MORE

  6. 4. Holocene environmental changes recorded by diatom stratigraphy in the southern Baltic Sea

    Author : Elinor Andrén; Rick W. Batterbee; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; allmän och historisk geologi; General and Historical Geology;

    Abstract : Sediment cores from the southern Baltic Sea and the Oder River estuary are analysed for their siliceous microfossil assemblages and organic carbon content. Long piston cores from the Bornholm and Gotland Basins provide data on the long-term Holocene history of the Baltic proper and serve as a natural background when evaluating the most recent environmental changes recorded in the short gravity cores. READ MORE

  7. 5. Impact cratering at sea

    Author : Jens Ormö; Richard A.F Grieve; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; allmän och historisk geologi; General and Historical Geology;

    Abstract : .... READ MORE