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dc.contributor.advisorStünitz, Holger
dc.contributor.advisorKonopásek, Jiří
dc.contributor.authorSchiffer, William Joel
dc.date.accessioned2017-08-21T06:31:28Z
dc.date.available2017-08-21T06:31:28Z
dc.date.issued2017-06-15
dc.description.abstractThe Lyngen Nappe, an allochthonous unit of the Northern Norwegian Caledonides, consists of Greenschist-facies rocks overlying Amphibolite- to Granulite-facies rocks in the Nordmannvik Nappe. The lower-grade metamorphism seen in the Lyngen rocks juxtaposes higher-grade rocks both above and below. The nature and origin of this metamorphic break is investigated, specifically in the sheared rock units comprising the contact between the Lyngen and Nordmannvik nappes, to determine the kinematic and metamorphic conditions present during the final emplacement of the Lyngen Magmatic Complex. These mafic rocks primarily consist of the Lyngen Gabbro, part of an ophiolite sequence formed in the former Iapetus Ocean, and now overly the metasedimentary paragneisses of the Nordmannvik Nappe that formed the Baltican basement. These nappes were emplaced and deformed during the Scandian orogenic phase of the Caledonian Orogeny. Structures observed in the field strongly indicate a top-to-the-West shear sense at this contact, while petrologic modelling of the rocks in this shear zone provide evidence for prograde development. Estimated metamorphic conditions of the Nordmannvik Gneiss (625-675°C and 8.5-10 kB) represent minimum values during Scandian shearing for temperature and pressure when compared to previous estimates (680-710°C and 9.4-10.1 kB [Faber, pers. comm., 2017]). Above the Nordmannvik rocks, a trend of decreasing temperatures and pressures is observed, with conditions of 580-600°C and 10-10.5 kB, followed in the higher rocks by estimates of 540-550°C and 7.5-8.25 kB. Structural and mineralogical similarities between the Garnet Mica gneisses of the Nordmannvik Nappe and the overlying phyllites and schists, however, hint at a common origin through retrograde metamorphism. An extensional detachment for the Lyngen Nappe is proposed, within a few possible tectonic models.en_US
dc.identifier.urihttps://hdl.handle.net/10037/11317
dc.language.isoengen_US
dc.publisherUiT Norges arktiske universiteten_US
dc.publisherUiT The Arctic University of Norwayen_US
dc.rights.accessRightsopenAccessen_US
dc.rights.holderCopyright 2017 The Author(s)
dc.subject.courseIDGEO-3900
dc.subjectVDP::Mathematics and natural science: 400::Geosciences: 450::Mineralogy, petrology, geochemistry: 462en_US
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Mineralogi, petrologi, geokjemi: 462en_US
dc.subjectVDP::Mathematics and natural science: 400::Geosciences: 450::Tectonics: 463en_US
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Tektonikk: 463en_US
dc.subjectVDP::Mathematics and natural science: 400::Geosciences: 450::Other geosciences: 469en_US
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Andre geofag: 469en_US
dc.titleStructural and metamorphic implications of the final emplacement of the Lyngen Nappeen_US
dc.typeMaster thesisen_US
dc.typeMastergradsoppgaveen_US


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