Sökning: "Zirkon"

Visar resultat 1 - 5 av 32 uppsatser innehållade ordet Zirkon.

  1. 1. Unraveling the Tectonic History of the Aurek Metagabbro within the Seve Nappe Complex, Scandinavian Caledonides

    Master-uppsats, Uppsala universitet/Institutionen för geovetenskaper

    Författare :Sabine Rousku; [2021]
    Nyckelord :Scandinavian Caledonides; Seve Nappe Complex; Aurek metagabbro; Kebnekaise Mountains; Zircon U-Pb Geochronology; Thermodynamic modeling; Geochemistry; Skandinaviska Kaledoniderna; Seveskollan; Aurek metagabbro; Kebnekaisebergen; zirkon U-Pb geokronologi; Termodynamisk modellering; Geokemi;

    Sammanfattning : The Scandinavian Caledonides form a mountain range comprising nappe stacks of numerous far-travelled thrust sheets. The thrust sheets consist of diverse lithologies representing pre- and synorogenic sedimentary and igneous rocks subsequently metamorphosed to various degrees, from the Late Neoproterozoic to Middle Devonian. LÄS MER

  3. 2. U-Pb age constraints on the host rocks of the Barsele Norra Volcanogenic Massive Sulphide deposit, northern Sweden

    Uppsats för yrkesexamina på avancerad nivå, Luleå tekniska universitet/Institutionen för samhällsbyggnad och naturresurser

    Författare :Maria Sandlund; [2021]
    Nyckelord :Geochronology; Skellefte district; Barsele; VMS; LA-ICP-MS; SEM;

    Sammanfattning : The Barsele area is located in the "Gold Line", southwest of the volcanogenic massive sulphide (VMS) Skellefte district which hosts more than 85 known VMS-deposits where some are gold-bearing. The Barsele area consists of the Central, Avan and Skiråsen intrusion hosted gold deposits, the Norra gold-bearing VMS-deposit and the Risberget zone. LÄS MER

  4. 3. Resolving temporal links between the Högberget granite and the Wigström tungsten skarn deposit in Bergslagen (Sweden) using trace elements and U-Pb LA-ICPMS on complex zircons

    Master-uppsats, Lunds universitet/Geologiska institutionen

    Författare :Anders Plan; [2020]
    Nyckelord :Bergslagen; Wigström; Högberget; geochronology; geochemistry; U-Pb; REE; trace element; zircon; hydrothermal zircon; LA-ICPMS; SEM; skarn; tungsten; wolfram; scheelite; deposit; ore; critical raw material; Earth and Environmental Sciences;

    Sammanfattning : Combined U-Pb and REE trace element LA-ICPMS analyses were performed on zircons, from the scheelite-bearing Wigström skarn, associated micro-granitic dykes and the highly evolved parental Högberget (sensu stricto) granite. Combined systematic of zircon typology and microtextures, trace elements and isotopic chemistry suggest the presence of several diverse zircon types, spanning from early- to late- magmatic stage into a hydrothermal stage. LÄS MER

  5. 4. Zircon U-Pb constraints on the timing of Sveconorwegian migmatite formation in the Western and Median Segments of the Idefjorden terrane, SW Sweden

    Master-uppsats, Lunds universitet/Geologiska institutionen

    Författare :Mimmi Ingered; [2019]
    Nyckelord :Sveconorwegian orogen; U-Pb; Zircon; Migmatite; Idefjorden terrane; Earth and Environmental Sciences;

    Sammanfattning : The Western and Median Segments of the Idefjorden terrane have been metamorphosed and migmatized during the Sveconorwegian orogeny (ca. 1 Ga), but the timing of these events between the two segments remains unclear. LÄS MER

  7. 5. Shock metamorphic features in zircon grains from the Mien impact structure : clues to conditions during impact

    Master-uppsats, Lunds universitet/Geologiska institutionen

    Författare :Josefin Martell; [2018]
    Nyckelord :Zircon; shock metamorphism; Mien; FRGN zircon; granular texture; Earth and Environmental Sciences;

    Sammanfattning : Jämfört med andra himlakroppar i vårt solsystem så finns det få välbevarade nedslagsstrukturer på jorden. Vi vet att jorden har påverkats av nedslag från rymden i lika stor utsträckning som övriga planeter och att dessa nedslag har influerat jordens geologiska och biologiska utveckling. LÄS MER