Search for dissertations about: "Petrology and Tectonics"

Showing result 26 - 30 of 31 swedish dissertations containing the words Petrology and Tectonics.

  2. 26. Stratigraphy and Geochemistry of the Palaeoproterozoic Dannemora inlier, north-eastern Bergslagen region, central Sweden

    Author : Peter Dahlin; Karin Högdahl; Olav Eklund; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Dannemora; Bergslagen region; volcaniclastic rocks; sedimentology; metasomatic alteration; lithogeochemistry; reflection seismic; Geovetenskap med inriktning mot mineralogi; petrologi och tektonik; Earth Science with specialization in Mineral Chemistry; Petrology and Tectonics;

    Abstract : The Palaeoproterozoic Dannemora inlier is situated in the north-eastern Bergslagen region. The inlier consists of primary and reworked volcanic deposits, stromatolitic limestone and skarn that have been subjected to upper greenschist facies metamorphism. READ MORE

  4. 27. Geological Evolution of the Supracrustal Palaeoproterozoic Hamrånge Group: A Svecofennian Case Study

    Author : Erik Ogenhall; Håkan Sjöström; Hans Annersten; Markku Väisänen; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Hamrånge; Ljusdal; Hagsta Gneiss Zone; geochemistry; geochronology; thermobarometry; metamorphism; fold-thrust belt.; Earth sciences; Geovetenskap; Geovetenskap med inriktning mot mineralogi; petrologi och tektonik; Earth Science with specialization in Mineral Chemistry; Petrology and Tectonics;

    Abstract : The work presented in this thesis utilizes several geological methods to investigate the origin and evolution of the supracrustal rocks in the Palaeoproterozoic Hamrånge Group (HG) in the south-central Swedish Svecofennian. The first paper is based on whole-rock geochemistry to show the plate tectonic setting of volcanic rocks within the HG. READ MORE

  5. 28. Evolution of a silicic magma reservoir in the upper crust : Reyðarártindur pluton, Southeast Iceland

    Author : Emma Rhodes; Steffi Burchardt; Abigail Barker; Charles F. Parker; Alexander Cruden; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; magma; magma emplacement; magma reservoir; floor subsidence; piecemeal subsidence; granite; pluton; cap-rock; magma mingling; magma plumbing systems; volcanic and igneous plumbing systems; eruption; Geovetenskap med inriktning mot mineralogi; petrologi och tektonik; Earth Science with specialization in Mineral Chemistry; Petrology and Tectonics;

    Abstract : Field observations of extinct and exposed magma reservoirs shed light on processes operating in the roots of presently active volcanoes. The Reyðarártindur pluton, Southeast Iceland is an example of a fossil shallow magma reservoir that fed eruptions. READ MORE

  6. 29. The Effect of Mechanical Characteristics of Basal Decollement and Basement Structures on Deformation of the Zagros Basin

    Author : Abbas Bahroudi; John Cosgrove; Uppsala universitet; []
    Keywords : decollement; extension; Zagros; Hormuz salt; shortening; basement faults; Arabia; mineralogi; petrologi och tektonik; Mineral Chemistry; Petrology and Tectonics;

    Abstract : Two fundamental structural elements, basement architecture and basal decollement, play a significant role in the evolution of a tectonically active region. Using different approaches (field data, literature review and analogue models) this thesis demonstrates that these two elements affected the deformation style in the Zagros fold-thrust belt during Mesozoic extensional and Cenozoic contractional episodes. READ MORE

  7. 30. Characterising volcanic magma plumbing systems : A tool to improve eruption forecasting at hazardous volcanoes

    Author : David A. Budd; Valentin Troll; Tod Waight; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; magma plumbing; oxygen isotopes; thermobarometry; crustal assimilation; Katla; Merapi; Kelud; Toba; volcanic hazards; Geovetenskap med inriktning mot mineralogi; petrologi och tektonik; Earth Science with specialization in Mineral Chemistry; Petrology and Tectonics;

    Abstract : This thesis attempts to develop our understanding of volcanic magma plumbing systems and the magmatic processes that operate within them, such as fractional crystallisation, crustal partial melting, assimilation, and magma mixing. I utilise petrology, rock and mineral geochemistry, and isotope systematics to seek to improve our ability to forecast the eruptive frequency and style of active volcanoes, an aspect often lacking in current volcano monitoring efforts. READ MORE