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Cr-spinels in the Franklinian Mobile Belt: a geochemical record of Paleozoic tectonics
Stockholm University, Faculty of Science, Department of Geological Sciences.
2019 (English)Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

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. The evolutionary trend of the ocean basin may have changed when the exotic crustal fragments now called the Pearya terrane were accreted to the North American margin through poorly understood tectonic processes sometime prior to the Devonian. The results of the analysis are used to determine the tectonic setting associated with the rock units. The results reveal that the Cr-spinels predominantly have a supra-subduction zone geochemical signature, suggesting an island arc origin.

Place, publisher, year, edition, pages
2019. , p. 98
Keywords [en]
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
Keywords [sv]
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
National Category
Geology
Identifiers
URN: urn:nbn:se:su:diva-178470OAI: oai:DiVA.org:su-178470DiVA, id: diva2:1389299
Presentation
2019-06-26, Högbomssalen, Svante Arrhenius väg 8, Stockholm, 10:30 (English)
Supervisors
Examiners
Available from: 2020-02-07 Created: 2020-01-29 Last updated: 2020-02-13Bibliographically approved

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