Sökning: "Lower Jurassic"

Visar resultat 1 - 5 av 12 uppsatser innehållade orden Lower Jurassic.

  1. 1. Assessing the biodiversity crisis within the Triassic-Jurassic boundary interval using redox sensitive trace metals and stable carbon isotope geochemistry

    Master-uppsats, Lunds universitet/Geologiska institutionen

    Författare :Halla Margrét Viðarsdóttir; [2020]
    Nyckelord :Stenlille; Schandelah; redox conditions; C-isotopes; marine sediments; trace elements; enrichment factors; mass extinction; Triassic – Jurassic boundary; Earth and Environmental Sciences;

    Sammanfattning : Around the Triassic-Jurassic-Boundary time interval, a severe mass extinction event occurred, which has been associated to volcanism of the Central Atlantic Magmatic Province (CAMP). Significant amounts of greenhouse gases as carbon dioxide (CO2) or methane (CH4) and other volatiles are suggested to have been released into the atmosphere, leading to global warming with subsequent impact on the biosphere. LÄS MER

  3. 2. Internal geology and emplacement processes of Kimberlites, Case Study from the Tsabong Kimberlite Field, Botswana

    Master-uppsats, Luleå tekniska universitet/Geovetenskap och miljöteknik

    Författare :Mpho Ndebele; [2020]
    Nyckelord :Kimberlites; Geology; Emplacement Processes; Botswana;

    Sammanfattning : The Crateceous (85 Ma) MK1 pipe is part of the Tsabong kimberlite cluster located approximately550km south west of Gaborone and geologically found within the Kapvaal Craton. The Tsabongkimberlite field consists of 86 known kimberlites. The MK1 pipe is the largest of this cluster at 140ha,1. LÄS MER

  4. 3. An Analysis and Interpretation of the Geoscience BC Trek Project Till Geochemical and Mineralogical Data to Determine the Surficial Geochemical Expression of Bedrock Au-Ag-Cu-Mo Mineralization on the Nechako Plateau, British Columbia, Canada.

    Kandidat-uppsats, Uppsala universitet/Institutionen för geovetenskaper

    Författare :Karin Öberg; [2016]
    Nyckelord :British Columbia; till; gold; copper; mineralization; British Columbia; morän; mineralisering; guld; koppar;

    Sammanfattning : The mineral exploration in the interior of British Columbia is challenged by an extensive coverage of glacial sediments. The Geoscience British Columbia (GBC) Targeting Resources through Exploration and Knowledge (TREK) Survey has since 2013 collected till samples in the northern interior plateau of British Columbia, covering an area of approximately 25,000km2. LÄS MER

  5. 4. Sedimentological study of the Jurassic and Cretaceous sequence in the Revinge-1 core, Scania

    Master-uppsats, Lunds universitet/Geologiska institutionen

    Författare :Casandra Hajny; [2016]
    Nyckelord :Jura; Krita; Vomb; Fyledalen; Vitabäck; Arnagergrönsand; Mollusker; Bivalver; Palynologi; Biostra-tigrafi; Vulkanism; Pyrit; Järnooider; Jurassic; Cretaceous; Vomb Trough; Vitabäck Clay; Fyledal Clay; Arnager Greensand; Molluscs; Bivalves; Palynology; Biostratigraphy; Volcanism; Pyrite; Iron ooids; Earth and Environmental Sciences;

    Sammanfattning : This thesis presents a study of the core from the Revinge-1 borehole from the Vomb Trough. The core displays strata from the Upper Jurassic to the Upper Cretaceous including strata covering the the J/K−boundary . LÄS MER

  7. 5. Formation evaluation of the Jurassic Stø and Nordmela formations in exploration well 7220/8-1, Barents Sea, Norway

    Master-uppsats, Lunds universitet/Geologiska institutionen

    Författare :Johan Kristensson; [2016]
    Nyckelord :Middle Jurassic; Lower Jurassic; Nordmela Formation; Stø formation; Barents Sea; sand resistivity; formation evaluation; shale effect; petroleum exploration; 7220 8-1; Schlumberger Techlog; Earth and Environmental Sciences;

    Sammanfattning : Evaluating reservoirs with alternating sequences of sand and shale meet the challenge of quantifying the effect from clay minerals. The clay minerals have an impact on logging tools and the resulting data. When not considering the effects, a formation evaluation will present incorrect results on e.g. LÄS MER