Sökning: "metamorphic"

Visar resultat 16 - 20 av 79 avhandlingar innehållade ordet metamorphic.

  1. 16. How do fluids move through rocks? : High fluxes of CO2 in the Earth's crust

    Författare :Barbara Kleine; Alasdair Skelton; Iain Pitcairn; Sandra Piazolo; Jaroslaw Majka; Zhihong Zhao; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; metamorphic fluid flow; blueschist preservation; fluid-rock interaction; Geology; geologi;

    Sammanfattning : Metamorphic hydrous, CO2-bearing fluids play a critical role in the global carbon cycle. However, how big this influence is on the global carbon cycle and therefore on global climatic processes, is unknown. The actual amount of CO2 which is released into the atmosphere due to metamorphic processes is still debated. LÄS MER

  3. 17. Ages, origins and metamorphic histories of some major nappe units in the southern Swedish Caledonides

    Författare :Stefan Claesson; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Geologi; Tektonik; Sverige; Jämtland;

    Sammanfattning : .... LÄS MER

  4. 18. On the origin and evolution of the palaeoproterozoic Aitik Cu-Au-Ag deposit, northern Sweden : a porphyry copper-gold ore, modified by multistage metamorphic-deformational, magmatic-hydrothermal, and IOCG-mineralizing events

    Författare :Christina Wanhainen; Luleå tekniska universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Malmgeologi; Ore Geology;

    Sammanfattning : The Aitik Cu-Au-Ag mine in the Gällivare area in northern Sweden is the biggest open pit operation in northern Europe and one of Europe’s largest metal producers. The open pit is almost 3 km long, 930 m wide and 345 m deep. Approximately 424 million tonnes of ore averaging 0.4% Cu, 0. LÄS MER

  5. 19. Early structural and metamorphic evolution of the Scandinavian Caledonides: a study of the eclogite-bearing Seve Nappe Complex at the Arctic Circle, Sweden

    Författare :Lena Gunlög Albrecht; Berggrundsgeologi; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; oblique compression.; C -type shear bands; anastomozing shear zones; tubular folds; lineation-parallel folds; northern Sweden; Grapesvare Nappe; Seve Nappe Complex; Finnmarkian; Eclogite; corona dolerite; Petrology; mineralogy; geochemistry; Petrologi; mineralogi; geokemi;

    Sammanfattning : In the Seve Nappe Complex of the Swedish Caledonides, coronitic diabases pass into eclogites; sometimes the transition occurs within one and the same boudin. Calculated pressure-temperature conditions for the eclogite facies stage are 20-27 kbar and 650-750°. LÄS MER

  7. 20. Vein controlled crystal size distributions of Barrovian index minerals

    Författare :Alexander Lewerentz; Alasdair Skelton; Uwe Ring; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : The concept of index mineral based metamorphic zones was first introduced by George Barrow in 1912, and Barrovian metamorphism is still applied by metamorphic petrologists. Today the importance of metamorphic fluids for driving metamorphic reactions is widely recognised. LÄS MER