Search for dissertations about: "Geochemistry"

Showing result 1 - 5 of 176 swedish dissertations containing the word Geochemistry.

  1. 1. Origin of organic compounds in fluids from ultramafic-hosted hydrothermal vents of the Mid-Atlantic Ridge

    University dissertation from Stockholm : Department of Geology and Geochemistry, Stockholm University

    Author : Cécile Konn; Stockholms universitet.; [2009]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Serpentinisation; hydrocarbons; organic compounds; ultramafic; hydrothermal; geochemistry; origin of life; NATURAL SCIENCES Earth sciences Other earth sciences; NATURVETENSKAP Geovetenskap Övrig geovetenskap; NATURAL SCIENCES Chemistry Other chemistry; NATURVETENSKAP Kemi Övrig kemi; NATURAL SCIENCES Earth sciences Exogenous earth sciences Exogenous geochemistry; NATURVETENSKAP Geovetenskap Exogen geovetenskap Exogen geokemi; geokemi; Geochemistry;

    Abstract : Natural gas, primarily methane (CH4), is produced in substantial amounts in ultramafic-hosted hydrothermal systems. These systems could also generate oil (heavier hydrocarbons) and the first building blocks of life (prebiotic molecules). In the presence of iron bearing minerals, serpentinisation reactions generate H2. READ MORE

  2. 2. Ocean chemistry and the evolution of multicellularity

    University dissertation from Stockholm : Department of Geological Sciences, Stockholm University

    Author : Emma U. Hammarlund; Stockholms universitet.; [2012]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Geochemistry; biology; paleontology; evolution; multicellularity; Geochemistry; geokemi;

    Abstract : Oxygen has been assumed to be a vital trigger for the evolution of multicellular life forms on Earth, partly based on its power to promote substantial energy flux in cell respiration and partly as biosynthesis of compounds like collagen require oxygen. However, the co-evolution of large life and the Earth’s chemical environment is not well understood at present, and there is particular disagreement in the field about whether the Cambrian explosion of animal life forms was a chemical or biological event. READ MORE

  3. 3. Hydrogeological and geochemical assessment of aquifer systems with geogenic arsenic in Southeastern Bangladesh Targeting low arsenic aquifers for safe drinking water supplies in Matlab

    University dissertation from Stockholm : KTH Royal Institute of Technology

    Author : Mattias von Brömssen; KTH.; [2012]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Arsenic; Bangladesh; drinking water; groundwater; sustainability; geochemistry; hydrogeology; modelling;

    Abstract : Naturally occurring arsenic (As) in Holocene aquifers in Bangladesh have undermined a long success of supplying the population with safe drinking water. Arsenic is mobilised in reducing environments through reductive dissolution of Fe(III)-oxyhydroxides. READ MORE

  4. 4. Sveconorwegian metallogenesis in Sweden

    University dissertation from Stockholm : Stockholm University

    Author : Elisabet Alm; Stockholms universitet.; [2000]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Geochemistry; geokemi;

    Abstract : Two main ore types are found in the Sveconorwegian Orogen in southwestern Sweden (Southwest Scandinavian Domain). One of them comprises stratabound Cu mineralizations in the Dal group, located west of lake Vänern. READ MORE

  5. 5. Benthic metabolism and sediment nitrogen cycling in Baltic sea coastal areas the role of eutrophication, hypoxia and bioturbation

    University dissertation from Department of Geological Sciences, Stockholm Univeristy

    Author : Stefano Bonaglia; Stockholms universitet.; [2012]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Eutrophication; Sediment; Benthic Flux; Nitrogen Cycle; Denitrification; Baltic Sea; Biogeochemistry; biogeokemi; marin- och brackvattensekologi; Marine and Brackish Water Ecology; marin ekologi; Marine Ecology; geokemi; Geochemistry;

    Abstract : Eutrophication is one of the greatest threats for the Baltic Sea, and one of its more critical consequences is bottom water hypoxia. Nutrient enrichment and oxygen-depletion affect both the deep central basins and a number of coastal areas, even though strategies for nutrient reduction have lately been implemented. READ MORE