Sökning: "gabbro"

Visar resultat 1 - 5 av 14 avhandlingar innehållade ordet gabbro.

1. 1. Layered intrusions of the Ulvö dolerite complex, Ångermanland, Sweden. : Geologiska Inst. Publ. A 36

   Författare :Sven Åke Larson; Göteborgs universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Layerd intrusion; gabbro; pyroxene; olivine; Fe-Ti oxide;

   Sammanfattning : .... LÄS MER

3. 2. Crystallization and Differentiation Processes in the Thin Layered Alkali Gabbroic Intrusions of the Ulvö Gabbro Complex, Central Sweden

   Författare :Johan Hogmalm; Göteborgs universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; layered intrusion; fractional crystallization; modal layering; in situ crystallization; Ulvö; saucer-shaped sill; post-cumulus; LA ICP-MS;

   Sammanfattning : Fractional crystallization of magma is a commonly invoked mechanism for chemical differentiation in systems that range from volcanoes to entire planets. However, the processes that control separation of crystals and liquids in natural systems remain controversial, since the dynamics of crystallizing magma chambers cannot be studied directly. LÄS MER

4. 3. Metamorphic zircon formation in gabbroic rocks – the tale of microtextures

   Författare :Victoria Beckman; Berggrundsgeologi; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Zircon formation; metamorphism; prograde; gabbr; zircon; baddeleyite; zircon; baddeleyite; metamorphic; prograde; zircon textures;

   Sammanfattning : Dating of metamorphic events is crucial for the understanding and reconstruction of large-scale geological processes such as orogenesis. Zircon is one of the most commonly used minerals for dating of igneous and metamorphic events. Zircon incorporates uranium and excludes lead during crystallization, and with time the uranium decays to lead. LÄS MER

5. 4. Origin of the Kleva Ni-Cu sulphide mineralisation in Småland, southeast Sweden

   Författare :Karolina Bjärnborg; Berggrundsgeologi; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Palaeoproterozoic; Fennoscandia; geochronology; geochemistry; sulphide remobilisation; gabbro–diorite; mantle; arc; ore genesis; Ni-Cu sulphide deposit;

   Sammanfattning : The Kleva Ni-Cu sulphide deposit is situated within a gabbro-diorite intrusive complex in southeast Sweden. The basement north of the intrusive complex is dominated by 1.81–1.77 Ga granites of the Palaeoproterozoic Transscandinavian Igneous Belt (TIB). LÄS MER

7. 5. Paleomagnetic studies of Jurassic to Tertiary rocks in Jamaica and Cuba

   Författare :Carlos Cruz Ferrán; Luleå tekniska universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Tillämpad geofysik; Applied Geophysics;

   Sammanfattning : Paleomagnetic studies have been performed on Jurassic to Tertiary rocks in Cuba and Jamaica. Samples of predominantly volcanic and sedimentary rocks were collected at 73 sites and the study included 792 samples. LÄS MER