Sökning: "banded iron formation"

Hittade 4 uppsatser innehållade orden banded iron formation.

  1. 1. Genetic relationships and origin of the Ädelfors gold deposits in Southeastern Sweden

    Master-uppsats, Luleå tekniska universitet/Institutionen för samhällsbyggnad och naturresurser

    Författare :Tobias Wiberg Steen; [2018]
    Nyckelord :Ädelfors; sulfur isotope ratio; pyrite chemistry; orogenic gold; gold; gold quartz vein; trace elements; gold mine; banded iron formation; SEM-EDS analysis; gold silver ratio; Ädelfors; svavelisotoper; pyritkemi; orogent guld; guldrik kvartsåder; guld; guldfyndighet; spårelement; bandad järnmalm; SEM-EDS analys; guld silver förhållande;

    Sammanfattning : Ädelfors is situated ca 17 km east of Vetlanda, Jönköping County, in the N-S striking Trans-scandinavian igneous belt and is a part of the NE-SW striking 1.83-1.82 Ga Oskarshamn-Jönköping belt emplaced during a continental subduction towards the Svecofennian continental margin. The continental arc hosts the 1. LÄS MER

  3. 2. A sedimentological study of Cryogenian glacial-interglacial cycles recorded by the Port Askaig Tillite Formation on Islay, Scotland

    Kandidat-uppsats, Stockholms universitet/Institutionen för geologiska vetenskaper

    Författare :Martin Dahlgren; [2018]
    Nyckelord :Cryogenian; Islay; Snowball Earth; Tillite;

    Sammanfattning : An interglacial mudstone sequence from the Port Askaig Tillite Formation on Islay was analysed using an Olympus XRF detector. The resulting geochemical log was compared with an XRF dataset acquired from a Quaternary sedimentary core from the Lomonosov Ridge in the Arctic Ocean. LÄS MER

  4. 3. Estimating soluble arsenic and phosphorus concentrations under Precambrian oceanic conditions

    Master-uppsats, Stockholms universitet/Institutionen för geologiska vetenskaper

    Författare :Christoffer Hemmingsson; [2014]
    Nyckelord :Arsenic; Phosphorus; Co-precipitation; Precambrian; Oceanic P levels; Ferrihydrite synthesis; Distribution coefficient; Banded iron formation;

    Sammanfattning : Original estimates of phosphorus (P) concentrations in the Precambrian oceans before 1.9 Ga gave a budget of ~10-25% of modern day levels. LÄS MER

  5. 4. En övergripande beskrivning av malmbildande processer med detaljstudier av en bandad järnmalm från södra Dalarna, Bergslagen

    Magister-uppsats, Lunds universitet/Geologiska institutionen

    Författare :Jan-Olof Öst; [2005]
    Nyckelord :geografi; geologi; malmbildande processer; bandad järnmalm; Dalarna; Bergslagen; Earth and Environmental Sciences;

    Sammanfattning : The Bergslagen region in south central Sweden is known for its diversity and quantity of ores. This study focuses on a tiny BIF (Banded Iron Formation) and its surrounding rocks in the southern part of Dalarna. The fieldwork was carried out in an area close to the town of Ludvika. LÄS MER