Sökning: "thermobarometry"

Visar resultat 1 - 5 av 6 avhandlingar innehållade ordet thermobarometry.

  1. 1. The dynamic emplacement of felsic magma in the upper crust

    Författare :Tobias Mattsson; Steffi Burchardt; Karen Mair; Christoph Breitkreuz; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; laccolith; cryptodome; magma emplacement; magma flow; magma rheology; granite; rhyolite; pluton; AMS; XCT; thermobarometry; Geovetenskap med inriktning mot mineralogi; petrologi och tektonik; Earth Science with specialization in Mineral Chemistry; Petrology and Tectonics;

    Sammanfattning : Felsic magma intrudes earth’s upper crust through a variety of mechanisms. Magma intrusion growth and shape have mainly been explained in terms of host rock properties and intrusion depth, while considering the magma as an overpressurised fluid. LÄS MER

  3. 2. Geological Evolution of the Supracrustal Palaeoproterozoic Hamrånge Group: A Svecofennian Case Study

    Författare :Erik Ogenhall; Håkan Sjöström; Hans Annersten; Markku Väisänen; Uppsala universitet; []
    Nyckelord :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;

    Sammanfattning : 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. LÄS MER

  4. 3. Pressure, temperature and time constraints on tectonic models for southwestern Sweden

    Författare :Eric Austin Hegardt; Göteborgs universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Sveconorwegian; Gothian; Hallandian; U‐Pb zircon ion probe dating; Sm-Nd garnet dating; thermobarometry; continental subduction; Eastern Segment; Median Segment; Western Segment;

    Sammanfattning : In this work, a number of key localities have been investigated in detail in order to provide precise constraints on models for the tectonic evolution of southern Sweden. The new data presented in this thesis show that there are large differences in terms of pre-Sveconorwegian tectonic evolution between the Eastern and Median-Western Segments situated on either side of the Mylonite Zone, a major shear zone as well as a structural and lithological boundary. LÄS MER

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

    Författare :David A. Budd; Valentin Troll; Tod Waight; Uppsala universitet; []
    Nyckelord :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;

    Sammanfattning : 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. LÄS MER

  7. 5. Trans-crustal magma storage in contrasting tectonic settings

    Författare :Harri Geiger; Frances Deegan; Valentin R. Troll; Katharine Cashman; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; magma plumbing systems; thermobarometry; oxygen isotope analysis; shallow arc storage systems;

    Sammanfattning : Magmatic plumbing systems comprise magma chambers, sheet intrusions, and conduits which link the Earth’s deep interior with the Earth’s surface. As such, they are the structural framework of magma transport and storage that is governed by complex physical and chemical processes in magma reservoirs and through the interaction of magma bodies with surrounding crustal rocks over timescales from hours to millions of years. LÄS MER