Sökning: "rheology of the crust"
Hittade 4 avhandlingar innehållade orden rheology of the crust.
1. The dynamic emplacement of felsic magma in the upper crust
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
2. Dynamic Modelling of Physical Processes in Magmatic Systems: Dyke Emplacement and Flow-Induced Crystal Rotations
Sammanfattning : The main motivation for this thesis is to develop and improve numerical tools and methods that help further our comprehension of the volcanic plumbing system and its dynamics.The commonly used standard elastic model predicts solutions of dyke shape, thickness, over-pressure and fracturing criteria that do not always fit natural observations. LÄS MER
3. Viscous-brittle deformation of shallowly emplaced silicic magma : Implications for outgassing and volcanic hazards
Sammanfattning : Silicic magma in the shallow crust has the potential to violently erupt, depending on its ability to release overpressures caused by magmatic volatiles (outgassing). Deformation-induced outgassing is prevalent along volcanic conduit margins, where ascending magma is sheared at high rates. LÄS MER
4. Deformation behaviour and chemical signatures of anorthosites: : Examples from southern West Greenland and south-central Sweden
Sammanfattning : 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. LÄS MER