Search for dissertations about: "magma flow"
Showing result 6 - 10 of 12 swedish dissertations containing the words magma flow.
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6. Magnetic anisotropy and paleomagnetism of precambrian rocks in the Fennoscandian shield
Abstract : This thesis presents three applications of the anisotropy of magnetic susceptibility (AMS) technique, dealing with tectonic and magmatic flow fabrics of Proterozoic igneous rocks in the central and northern parts of the Fennoscandian Shield. Paleomagnetic measurements were performed in attempts to put the different rock units into a geological and plate tectonic context. READ MORE
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7. Numerical and laboratory studies of seismic properties and elements of rock fabric from the microscale to the macroscale
Abstract : Physical properties of rocks studied in the laboratory are useful to provide constraints on the dynamics of Earth?s interior. This may include direct constraints on in-situ seismic properties, such as elastic wave velocity measurements that can be compared to seismological data, or petrofabric indicators such as anisotropy of magnetic susceptibility (AMS). READ MORE
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8. Volcanism at the tip of a propagating rift : the Heimaey volcanic centre, south Iceland
Abstract : Primary magmas are generated by 4-6% partial melting near the garnet-spinel stability fields beneath Heimaey (i.e. 80-65 km depth). The magmas fractionate 31% olivine and clinopyroxene en-route to ponding at the base of the crust (and forming a parental Vestmannaeyjar magma). READ MORE
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9. 3D Structure and Emplacement of the Alnö Alkaline and Carbonatite Complex, Sweden : Integrated Geophysical and Physical Property Investigations
Abstract : Carbonatites are carbonate-rich magmatic rocks that are rare and of great relevance for our understanding of crustal and mantle processes. Although found on all continents and in settings ranging from Archaean to present-day, their deeper plumbing system is still poorly understood. READ MORE
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10. The geochemistry and petrogenesis of the Notträsk mafic intrusion, northern Sweden
Abstract : The Notträsk intrusive body is an early Proterozoic layered mafic intrusion probably of lopolithic form. It intrudes metasedimentary gneisses and shows the characteristics of Precambrian plutons which are contemporaneous with intercratonic tholeiitic volcanism; it represents the cumulates of a crustal-level magma chamber that may have been the source of basaltic volcanism in the area. READ MORE