Sökning: "magnetit"

Visar resultat 21 - 25 av 45 uppsatser innehållade ordet magnetit.

  1. 21. Geochemical and palaeomagnetic characteristics of a Swedish Holocene sediment sequence from Lake Storsjön, Jämtland

    Master-uppsats, Lunds universitet/Geologiska institutionen

    Författare :Joakim Robygd; [2015]
    Nyckelord :Jämtland; geochemistry; palaeomagnetism; PSV; sedimentation rate; Holocene development; geochronology; climate change; Earth and Environmental Sciences;

    Sammanfattning : As a part of a French-Swedish collaboration project to reconstruct middle to northern European climate variations during the Holocene, a sediment sequence from Lake Storsjön, Jämtland was retrieved and analysed for geochemical and palaeomagnetic properties. The subsampled sequence, composed of one freeze core and three Niederreiter piston cores, revealed information of both climatic, environmental and anthropogenic changes over the past 10,800 years. LÄS MER

  3. 22. Deformation, metamorphism and remobilisation in the Hornkullen polymetallic deposit, western Bergslagen, Sweden

    Master-uppsats, Uppsala universitet/Institutionen för geovetenskaper

    Författare :Stefan Andersson; [2014]
    Nyckelord :ore genesis; Bergslagen; deformation; remobilisation; metamorphism; geothermobarometry; malmbildning; Bergslagen; deformation; ommobilisering; metamorfos; geotermobarometri;

    Sammanfattning : The polymetallic Hornkullen deposit is situated in the western part of the Bergslagen ore province, Sweden. It is hosted by an inlier of approximately 1.90-1.88 Ga Svecofennian volcanic and sedimentary metasupracrustal rocks enclosed in a significantly younger, c. LÄS MER

  4. 23. Basalt and Andesite Magma Storage and Evolution in Puyehue Volcano (40.5 °S), Chile

    Master-uppsats,

    Författare :Joaquim Otero; [2013]
    Nyckelord :Volcano; Thermobarometry; Puyehue; Basalt; Andesite; Contamination;

    Sammanfattning : The study of magmatic processes and their location in the crustal profile is fundamental for the understanding of the volcanic systems and their associated hazards. Changes and continuities in magma storage zones, fractional crystallization and crustal contamination are studied over a time span of 300 ka in Puyehue Volcano in the Southern Volcanic Zone, Chile. LÄS MER

  5. 24. Mineralogisk och malmpetrografisk studie av disseminerade sulfider i rika och fattiga prover från Kleva

    Kandidat-uppsats, Lunds universitet/Geologiska institutionen

    Författare :Andreas Björk; [2013]
    Nyckelord :disseminerad malm; mineralisering; Kleva; koppar-nickel; copper nickel mineralization; disseminated ore.; Earth and Environmental Sciences;

    Sammanfattning : The Kleva copper-nickel sulphide mineralization in Jonkoping County, southeastern Sweden, is categori-sed as an elongated mafic pluton. In this study, ore microscopy and quantitative chemical analysis using SEM -EDS have been used to describe the relative abundance and distribution of sulphides and iron oxides in disseminated samples. LÄS MER

  7. 25. Sulfidmineral i Salatrakten : med en introduktion i opakmikroskopi

    Kandidat-uppsats, Uppsala universitet/Institutionen för geovetenskaper

    Författare :Pia Karlsson; [2013]
    Nyckelord :;

    Sammanfattning : Sala är beläget i Bergslagen och bergarterna hör därmed till den svekofenniska berggrunden. Berggrunden domineras av 1.9-1.87 Ga sedimentära-, vulkaniska- och metamorfa bergarter. LÄS MER