Search for dissertations about: "ultramafic"
Showing result 6 - 10 of 10 swedish dissertations containing the word ultramafic.
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6. Deformation behaviour and chemical signatures of anorthosites: : Examples from southern West Greenland and south-central Sweden
Abstract : Plagioclase is the most abundant mineral in the lower crust and it is thus important to constrain the behaviour of plagioclase during deformation. Anorthosites, which are plagioclase-rich rocks, are common in Archaean cratons but their origin and rheological importance is still debated. READ MORE
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7. 3D Geophysical and Geological Modeling in the Skellefte District: Implications for Targeting Ore Deposits
Abstract : With the advancements in acquisition and processing of seismic reflection data recorded over crystalline rocks, building three-dimensional geologic models becomes increasingly favorable. Because of little available petrophysical data, interpretations of seismic reflection data in hardrock terrains are often speculative. READ MORE
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8. Timing and Origin of Igneous Rocks in the Gällivare area, Northern Sweden
Abstract : The Gällivare area is one of Europe’s top mining regions. The area is located in the northern Norrbotten ore district which hosts ore deposits such as the Malmberget underground iron ore mine, the Aitik open pit Cu-Au mine and the currently explored Nautanen Cu-Au deposit. In addition, several small, mineralized bodies are found. READ MORE
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9. U-Pb baddeleyite geochronology of Precambrian mafic dyke swarms and complexes in southern Africa - regional scale extensional events and the origin of the Bushveld Complex
Abstract : Dolerite dykes are formed when iron- and magnesium-rich (mafic) mantle-derived magmas ascend through the lithosphere (upper part of the mantle) and crystallize as ‘hydro-fractures’ within the crust. Dykes may exist in great numbers to form dyke swarms (linear or radiating), which can be linked to time periods of continental break-up, or attempted break-up events, associated with voluminous volcanism. 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