Sökning: "dyke events"

Visar resultat 1 - 5 av 8 uppsatser innehållade orden dyke events.

  1. 1. Unravelling the timing and distribution of Paleoproterozoic dyke swarms in the eastern Kaapvaal Craton, South Africa

    Master-uppsats, Lunds universitet/Geologiska institutionen

    Författare :Camilo Esteban Gaitan Valencia; [2019]
    Nyckelord :Kaapvaal; Mashining; black hills; dyke events; U-Pb geochronology; baddeleyite; geochemistry; Earth and Environmental Sciences;

    Sammanfattning : I denna uppsats presenterar jag kristallisationsåldrar, petrografi och geokemisk sammansättning för diabasgångar och en lagergång i östra och sydöstra Kaapvaal kratonen, Sydafrika. Dessa nya resultat ger mer exakta och pålitliga resultat än tidigare dateringar för diabaser tillhörande den s.k. LÄS MER

  3. 2. U-Pb baddeleyite dating of intrusions in the south-easternmost Kaapvaal Craton (South Africa) : revealing multiple events of dyke emplacement

    Master-uppsats, Lunds universitet/Geologiska institutionen

    Författare :Emilie Larsson; [2015]
    Nyckelord :U-Pb; baddeleyite; Kaapvaal Craton; mafic dykes; geochronology; Earth and Environmental Sciences;

    Sammanfattning : This study presents U-Pb baddeleyite ages for five dolerite dykes and one sill in the Mesoarchean granitic basement of south-easternmost Kaapvaal Craton in northern KwaZulu-Natal, South Africa. The oldest dyke is ENE-trending, and is dated to 2729 ± 5 Ma. LÄS MER

  4. 3. U-Pb geochronology of the Tsineng dyke swarm and paleomagnetism of the Hartley Basalt Formation, South Africa : evidence for two separate magmatic events at 1.93 – 1.92 and 1.88 – 1.84 Ga in the Kalahari craton

    Master-uppsats, Lunds universitet/Geologiska institutionen

    Författare :Farnaz Alebouyeh Semami; [2014]
    Nyckelord :Kaapvaal; Tsineng; Hartley; baddeleyite; U-Pb geochronology; paleomagnetism; polar wander path; Kalahari; Earth and Environmental Sciences;

    Sammanfattning : Robust geochronology and well-constrained paleopoles are the main tools for paleogeographic reconstructions. Through the completion of so called barcode diagrams (matching of coeval events of mafic magmatism between blocks) and determination of the apparent polar wander paths, these studies provide a better understanding of the position of continents and supercontinents in the past. LÄS MER

  5. 4. U-Pb baddeleyite geochronology and geochemistry of the White Mfolozi Dyke Swarm : unravelling the complexities of 2.70-2.66 Ga dyke swarms on the eastern Kaapvaal Craton, South Africa

    Master-uppsats, Lunds universitet/Geologiska institutionen

    Författare :Johan Rådman; [2014]
    Nyckelord :Kaapvaal Craton; White Mfolozi Dyke Swarm; geochronology; U-Pb; baddeleyite; Diabase; Dolerite; geokronologi; baddeleyit; Earth and Environmental Sciences;

    Sammanfattning : Numerous mafic dykes of different generations and trends intrude the eastern part of the Kaapvaal Cra-ton. On eastern Kaapvaal, there are three previously investigated dyke swarms that appear to radiate out from the eastern lobe of the Bushveld Complex. The NE- and E trending branches comprise dykes dated at ca. LÄS MER

  7. 5. When did the Kalahari craton form? : constraints from baddeleyite U-Pb geochronology and geo-chemistry of mafic intrusions in the Kaapvaal and Zimbabwe cratons

    Master-uppsats, Lunds universitet/Geologiska institutionen

    Författare :Nadine März; [2010]
    Nyckelord :geography; geology; Kalahari craton; baddeylite U-Pb geochronology; mafic intrusions; Kaapvaal craton; Zimbabwe craton; Earth and Environmental Sciences;

    Sammanfattning : Nordost om Bushveldkomplexen i Kaapvaal kratonen finns en mäktig gångsvärm av nordost-orienterade diabasgångar tillhörande ”the Black Hills dyke swarm”. Med hjälp av U- Pb metoden av mineral baddeleyit daterades fem gångar inom ålderspannet 1.87 - 1.85 Ga, där två av dem ger exakta åldrar på 1852 ± 5 Ma och 1863 ± 7 Ma. LÄS MER