Sökning: "öbåge"

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

  1. 1. Cr-spinels in the Franklinian Mobile Belt : a geochemical record of Paleozoic tectonics

    Kandidat-uppsats, Stockholms universitet/Institutionen för geologiska vetenskaper

    Författare :Malvina Forbes Halldén; [2019]
    Nyckelord :geology; geochemistry; spinel; Cr-spinel; chromite; SEM; scanning electron microscope; electron microprobe; EMP; electron probe microanalyzer; EPMA; electron micro probe analyzer; EMPA; petrogenetic indicator; microscopy; alteration; Franklinian Mobile Belt; Kulutingwak Formation; Clements Markham fold belt; Pearya; Paleozoic; suprasubduction zone; SSZ; island arc; IA; Arctic Canadian Archipelago; Ellesmere Island; Canada; 2017 Circum-Arctic Structural Events Expedition 19; Memorial University of Newfoundland; geologi; geokemi; spinell; Cr-spinell; kromit; SEM; svepeletronmikroskopi; elektronmikrosondanalys; EMP; EPMA; EMPA; petrogenetisk indikator; mikroskopi; Franklinian Mobile Belt; Kulutingwak-formationen; Clements Markham fold belt; Pearya; Paleozoikum; suprasubduktionszon; SSZ; öbåge; IA; Kanadas arktiska öar; Ellesmereön; Kanada; 2017 Circum-Arctic Structural Events Expedition 19; Memorial University of Newfoundland;

    Sammanfattning : The chemical compositions of Cr-spinel extracted from mafic and ultramafic rocks collected on Ellesmere Island in the Arctic Canadian Archipelago were obtained through electron microprobe analyses. The extensively altered rocks are sampled from rock units in the Franklinian MobileBelt, which is representative of a Paleozoic tectonically active oceanic regime of which little is presently known. LÄS MER

  3. 2. Radiogenic Dating and Microstructure Analysis of Shear Zones Found Within the Seve Nappe Complex in the Åre Region, Jämtland, Scandinavian Caledonides

    Master-uppsats, Uppsala universitet/Institutionen för geovetenskaper

    Författare :Cameron Alessandrini; [2017]
    Nyckelord :Rb-Sr dating; Ar-Ar dating; Lower Seve Nappe; Scandinavian Caledonides; COSC drillhole.; Rb-Sr datering; Ar-Ar datering; Seveskollan; skandinaviska Kaledoniderna; vit glimmer; COSC borrkärna.;

    Sammanfattning : The North Atlantic Caledonides are a continent-continent collision type orogeny found in WesternScandinavia, Svalbard, Greenland and the British Isles. They are thought to have formed as a result of a complex history consisting of repeated ocean opening and closure. LÄS MER

  4. 3. Pressure-Temperature-time Constraints on the Deep Subduction of the Seve Nappe Complex in Jämtland and southern Västerbotten, Scandinavian Caledonides

    Master-uppsats, Uppsala universitet/Institutionen för geovetenskaper

    Författare :Johanna Holmberg; [2017]
    Nyckelord :Seve Nappe Complex; COSC-1; Raman spectroscopy; QuiG barometry; kyanite-garnet gneiss; Lu-Hf garnet geochronology; Seveskollan; COSC-1; Raman spektroskopering; QuiG barometri; kyanit-granatförande gnejs; Lu-Hf granat geokronologi;

    Sammanfattning : The Scandinavian Caledonides are defined by long transported thrust sheets emplaced in a nappe stratigraphic succession onto the Paleozoic Baltica platform, as a result of the collision between the paleo-continents Baltica and Laurentia. This Palaeozoic collisional orogen is nowadays exposed at mid-crustal levels, thus provides an excellent ground for in situ studies of mountain building processes. LÄS MER

  5. 4. Hur bildades Bushveldkomplexet?

    Kandidat-uppsats, Lunds universitet/Geologiska institutionen

    Författare :Filip Ivarsson; [2015]
    Nyckelord :chromite; intrusion; platinum; LIP; Bushveld Complex; Earth and Environmental Sciences;

    Sammanfattning : The Bushveld complex is the world’s largest mafic intrusion and located on the Archean Kaapvaal craton, southern Africa. The complex’s host rock has anomalous quantities of platinum-group elements (PGE), chromite and other valuable metals of high demand. LÄS MER

  7. 5. Amphibolites, structures and metamorphism on Flekkerøy, south Norway

    Master-uppsats, Lunds universitet/Geologiska institutionen

    Författare :Ina Vang; [2011]
    Nyckelord :amphibolite; structures; metamorphism; bedrock; Flekkerøy; southern Norway; Kristiansand; amfibolit; strukturer; metamorfos; berggrund; södra Norge; Earth and Environmental Sciences;

    Sammanfattning : The island of Flekkerøy outside Kristiansand, southern Norway, consists of meta-greywacke, amphibolitic gneiss, granitic gneiss, tonalitic gneiss, hornblenditic mafite, pegmatite and metadolerite. The oldest rocks were probably formed around 1.5 Ga in an arc environment. During the Sveconorwegian orogeny, 1. LÄS MER