Search for dissertations about: "magmatism"

Showing result 1 - 5 of 29 swedish dissertations containing the word magmatism.

  1. 1. New Zircon geochronological and Nd isotopic evidence for Neoproterozoic crust reworking events in the Abas terrane, Yemen

    University dissertation from Stockholm : Stockholm University

    Author : Fitsum Girum Yeshanew; Stockholms universitet.; [2014]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Precambrian; Arabian Shield; magmatism; U-Pb; zircon; post-collisional magmatism; Nd isotopes; Geology; geologi;

    Abstract : The Arabian-Nubian Shield is an excellent natural laboratory to study crust formation processes during the Neoproterozoic. It is one of the largest juvenile tracts of continental crust formed during this time. It diachronously evolved between the breakup of Rodinia (c.780 Ma) and amalgamation of Gondwana (c. READ MORE

  2. 2. Magmatism in the Cenozoic Ethiopian rift zone : the case against the Afar plume hypothesis

    University dissertation from Luleå : Luleå tekniska universitet

    Author : Begashaw Wolde; [1996]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Applied Geology; Tillämpad geologi;

    Abstract : Volcanism and rifting in the Afro-Arabian, i.e. Red Sea - Gulf of Aden - Ethiopian, region have often been attributed to a Tertiary plume centered on Afar, at the junction of the three rifts. READ MORE

  3. 3. Silicic Magma Genesis in Basalt-dominated Oceanic Settings Examples from Iceland and the Canary Islands

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Sylvia E. Berg; Uppsala universitet.; [2016]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Silicic magmatism; Iceland; magma-crust interaction; proto-continental crust; early Earth; zircon geochronology and geochemistry; oxygen isotopes; 2011-2012 El Hierro eruption; crustal xenoliths; 3D X-ray μ-CT; volatiles; Geovetenskap med inriktning mot mineralogi; petrologi och tektonik; Earth Science with specialization in Mineral Chemistry; Petrology and Tectonics;

    Abstract : The origin of silicic magma in basalt-dominated oceanic settings is fundamental to our understanding of magmatic processes and formation of the earliest continental crust. Particularly significant is magma-crust interaction that can modify the composition of magma and the dynamics of volcanism. READ MORE

  4. 4. Processes of Magma-crust Interaction Insights from Geochemistry and Experimental Petrology

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Frances M Deegan; Uppsala universitet.; [2010]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Canary Island magmatism; HP-HT experimental petrology; magma-crust interaction; Merapi volcano; radiogenic isotopes Sr; Nd; Pb ; stable isotopes O; B .; NATURAL SCIENCES Earth sciences Endogenous earth sciences Solid earth geology and petrology; NATURVETENSKAP Geovetenskap Endogen geovetenskap Berggrundsgeologi och petrologi; Geovetenskap med inriktning mot mineralogi; petrologi och tektonik; Earth Science with specialization in Mineral Chemistry; Petrology and Tectonics;

    Abstract : This work focuses on crustal interaction in magmatic systems, drawing on experimental petrology and elemental and isotope geochemistry. Various magma-chamber processes such as magma-mixing, fractional crystallisation and magma-crust interaction are explored throughout the papers comprising the thesis. READ MORE

  5. 5. Tectonic implications of ca. 1.45 Ga granitoid magmatism at the southwestern margin of the East European Craton

    University dissertation from Audrius Cecys, Sölvegatan 12, 22362 Lund

    Author : Audrius Cecys; Lunds universitet.; Lund University.; [2004]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Geologi; southern Sweden; fysisk geografi; physical geography; Mesoproterozoic; geochemistry; syntectonic; petrology; structural geology; anisotropy of magnetic susceptibility; Danopolonian orogeny; Geology; granite;

    Abstract : Popular Abstract in Swedish Planeten Jordens yttersta lager består av fast berg och kallas jordskorpan. Det finns två olika typer.av jordskorpa. Den ena är ocean, den andra kontinental. READ MORE