Sökning: "Petrology"

Visar resultat 21 - 25 av 66 avhandlingar innehållade ordet Petrology.

  1. 21. Petrology, mineralogy and geochemistry of the alkaline rocks, Jombo hill, Kenya

    Författare :Isaac O. Nyambok; Uppsala universitet; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP;

    Sammanfattning : .... LÄS MER

  3. 22. How were high-pressure rocks exhumed in Naxos, Greece?

    Författare :Alexandre Peillod; Uwe Ring; Johannes Glodny; Alasdair Skelton; Joakim Mansfeld; Jaroslaw Majka; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; extrusion wedge Naxos petrology metamorphism; Mineralogy; Petrology and Geochemistry; mineralogi; petrologi och geokemi;

    Sammanfattning : Combining petrological and geochronological data we were able to show that rocks in south Naxos completed a full blueschist-/greenschist-facies metamorphic loop in about 10 Myr, distinctly faster than hitherto believed. We show that the high-pressure rocks reached peak pressure (16.3±0.9 kbar - 619 ±32°C) between 40. LÄS MER

  4. 23. Deformation behaviour and chemical signatures of anorthosites: : Examples from southern West Greenland and south-central Sweden

    Författare :Henrik Svahnberg; Sandra Piazolo; Anders Scherstén; Holger Stünitz; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; anorthosite; plagioclase; deformation; strain localisation; fluid-rock interaction; electron backscatter diffraction EBSD ; Solid earth geology and petrology; Berggrundsgeologi och petrologi; Mineralogy; Petrology and Geochemistry; mineralogi; petrologi och geokemi;

    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

  5. 24. Magma-Crust Interaction at Subduction Zone Volcanoes

    Författare :Ester M. Jolis; Valentin R Troll; Silvio Mollo; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; magma-crust interaction; stable isotopes O-C ; radiogenic isotopes Sr-Nd-Pb ; calc-silicate xenoliths; HP-HT experimental petrology; crustal volatiles; Vesuvius; Merapi; Kelut; the Sunda arc; Geovetenskap med inriktning mot mineralogi; petrologi och tektonik; Earth Science with specialization in Mineral Chemistry; Petrology and Tectonics;

    Sammanfattning : The focus of this work is magma-crust interaction processes and associated crustal volatile release in subduction zone volcanoes, drawing on rock, mineral, and gas geochemistry as well as experimental petrology. Understanding the multitude of differentiation processes that modify an original magma during ascent to the surface is vital to unravel the contributions of the various sources that contribute to the final magmas erupted at volcanoes. LÄS MER

  7. 25. Geochronology and petrology of mafic dykes in the Idefjorden terrane of the Sveconorwegian province, SW Sweden

    Författare :Fredrik Hellström; Göteborgs universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : .... LÄS MER