Sökning: "carbonatites"

Visar resultat 1 - 5 av 6 uppsatser innehållade ordet carbonatites.

  1. 1. Magnetic Mineralogy of Nb-bearing Carbonatites from Oldoinyo Dili (Tanzania)

    Kandidat-uppsats, Uppsala universitet/Institutionen för geovetenskaper

    Författare :Julia Frejd; [2021]
    Nyckelord :carbonatites; niobium; rare earth elements; Oldoinyo Dili; magnetic properties; karbonatiter; niob; rare earth elements; Oldoinyo Dili; magnetiska egenskaper;

    Sammanfattning : Niobium (Nb) and Rare Earth Elements (REE’s) have in recent years received considerable attention because of their importance to the modern technical industry, and more specifically the enhanced sustainability that comes with them. The main source for Nb and REE’s on Earth are carbonatites and associated alkaline silicate rocks. LÄS MER

  3. 2. An Innovative In-Tunnel Seismic Study for Sustainably Extracting Apatite Ore at the Siilinjärvi Mine, Eastern Finland

    Master-uppsats, Uppsala universitet/Institutionen för geovetenskaper

    Författare :Anna Donczew; [2019]
    Nyckelord :in-tunnel seismic; reflection seismic; traveltime tomography; carbonatites; shear zones; Siilinjärvi; tunnelseismik; reflektionsseismik; restidstomografi; karbonatiter; skjuvzoner; Siilinjärvi;

    Sammanfattning : Siilinjärvi located in eastern Finland is presently the only phosphate mine with significant phosphorus production in western Europe. Phosphate rock and phosphorus are known as a critical raw material for the European Union due to their economic importance and being prone to the supply risks. LÄS MER

  4. 3. Alnö Carbonatite: A Future Moneymaker?

    Kandidat-uppsats, Uppsala universitet/Institutionen för geovetenskaper

    Författare :Aklaqur Rahman; [2017]
    Nyckelord :The Alnö Complex; carbonates; rare earth elements; polarising microscope; Alnökomplexet; karbonatiter; sällsynta jordartsmetaller; mikroprob;

    Sammanfattning : Carbonatites are rare igneous rocks, which contain at least 50 %, carbonate minerals. They are often found along with alkaline silicate rocks, meaning that they contain relatively large amounts of Na2O and K2O, and important tools to understand mantle processes. LÄS MER

  5. 4. Study of opaque phases in carbonatites of the Grønnedal-Íka alkaline complex, Southwest Greenland

    Kandidat-uppsats, Stockholms universitet/Institutionen för geologiska vetenskaper

    Författare :Eemu Ranta; [2015]
    Nyckelord :carbonatite; opaque phases; oxides; magnetite; hydrothermal fluids; Grønnedal-Íka; Greenland;

    Sammanfattning : Opaque phases from carbonatites of the Grønnedal-Íka alkaline complex (1299±17 Ma) of Southwest Greenland were analyzed in terms of their mineralogy and microstructure. The analysis demonstrates that a later intrusion by a 55 m wide dolerite dyke of unknown age has prompted the mineralization of magnetite by activating hydrothermal fluid convection. LÄS MER

  7. 5. Carbonatites at the Alnö Complex, Sweden and along the East African Rift : a literature review

    Kandidat-uppsats, Lunds universitet/Geologiska institutionen

    Författare :Alexandra Åhlén; [2015]
    Nyckelord :natrocarbonatite; East African Rift; carbonatite; Alnö Island; Earth and Environmental Sciences;

    Sammanfattning : Carbonatite is an unusual type of rock that, for a long time, were not accepted for what they really are. This group of rocks is now considered to be of igneous origin and is classified after its content of carbonate minerals. If it exceed 50% the rock will be named a carbonatite. LÄS MER