Essays about: "mafic dykes"

Showing result 1 - 5 of 11 essays containing the words mafic dykes.

  1. 1. Volcanic facies and hydrothermal alteration at the Norra volcanigenic massive sulfide deposit : Storuman area, Sweden

    University essay from Luleå tekniska universitet/Institutionen för samhällsbyggnad och naturresurser

    Author : Meseret Gebreyesus; [2020]
    Keywords : Volcanic massive sulfide deposit; alteration zonation; volcanic chemostratigraphy; facies architecture;

    Abstract : The Skellefte District, with a long and rich history of base metal extraction that commenced asearly as 1924, is rated amongst the leading mining provinces in Sweden and Europe. The districtrepresents a Paleoproterozoic volcanic arc hosting more than 85 known (gold-bearing) VMSdeposits and several economic grade orogenic gold occurrences. READ MORE

  3. 2. New geochronological constraints on the Klipriviersberg Group: defining a new Neoarchean large igneous province on the Kaapvaal Craton, South Africa

    University essay from Lunds universitet/Geologiska institutionen

    Author : Joaen Stamsnijder; [2017]
    Keywords : LA-ICP-MS; U–Pb geochronology; ID-TIMS; baddeleyite; Klipriviersberg Group; LIP; South Africa; Earth and Environmental Sciences;

    Abstract : In recent years, there has been a significant improvement in our ability to determine the ages of extensive short-lived magmatic events (large igneous provinces) dominated by rocks of mafic (silica-poor) compositions. This has been aided by targeting the magmatic feeders to these large igneous provinces (e.g. READ MORE

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

    University essay from Lunds universitet/Geologiska institutionen

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

    Abstract : 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. READ MORE

  5. 4. Metadolerites as quantitative P-T markers for Sveconorwegian metamorphsim, SW Sweden

    University essay from Lunds universitet/Geologiska institutionen

    Author : Birgit Fredrich; [2014]
    Keywords : Earth and Environmental Sciences;

    Abstract : Strukturellt unga och N-S-ligt strykande högmetamorfa metadiabaser förekommer i Östra segmentet längs västkusten från Varberg till Kullaberg, och i inlandet mot öster till den Svekonorvegiska fronten. Dessa basiska gångar skär ställvis gnejsiga strukturer i värdbergarterna. READ MORE

  6. 5. 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

    University essay from Lunds universitet/Geologiska institutionen

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

    Abstract : 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. READ MORE