Essays about: "diabas"

Showing result 1 - 5 of 8 essays containing the word diabas.

  1. 1. Feasibility of Enhanced Geothermal Systems in the Precambrian crystalline basement in SW Scania, Sweden

    University essay from Lunds universitet/Geologiska institutionen

    Author : Hanna Kervall; [2021]
    Keywords : EGS; deep drilling; geothermal; petrology; petrophysical properties; Sveconorwegian; Earth and Environmental Sciences;

    Abstract : The ability to evaluate the geothermal potential at a depth of five to six kilometres in the crystalline bedrock is crucial for the EGS-technology to be utilized in the future. This work focuses primarily on presenting expected geological conditions at great depths in southwestern Scania. The study is based on information from E. READ MORE

  3. 2. Mineralogy and petrology of a drill core section from Borg, SW Norrköping – fracture fillings and tentative mineral reactions

    University essay from Stockholms universitet/Institutionen för geologiska vetenskaper

    Author : Ting-Fung Chong; [2019]
    Keywords : Swedish Transport Administration; mineral reactions; diabas; dolerite; mafic rock; xrd; xrf; Trafikverket; Norrköping; Ostlänken; Bergslagen;

    Abstract : During drilling at Borg, ca. 5 km southwest of central Norrköping, an unidentified fine-grained grey rock was encountered in contact with dark red granitic gneiss at 35m depth. The fine-grained grey rock occurs above the red granitic gneiss. READ MORE

  4. 3. New geochronological constraints on the Klipriviersberg Group: defining a new Neoarchean large igneous province on the Kaapvaal Craton, South Africa

    University essay from Lunds universitet/Geologiska institutionen

    Author : Joaen Stamsnijder; [2017]
    Keywords : LA-ICP-MS; U–Pb geochronology; ID-TIMS; baddeleyite; Klipriviersberg Group; LIP; South Africa; Earth and Environmental Sciences;

    Abstract : In recent years, there has been a significant improvement in our ability to determine the ages of extensive short-lived magmatic events (large igneous provinces) dominated by rocks of mafic (silica-poor) compositions. This has been aided by targeting the magmatic feeders to these large igneous provinces (e.g. READ MORE

  5. 4. Amphibolites, structures and metamorphism on Flekkerøy, south Norway

    University essay from Lunds universitet/Geologiska institutionen

    Author : Ina Vang; [2011]
    Keywords : amphibolite; structures; metamorphism; bedrock; Flekkerøy; southern Norway; Kristiansand; amfibolit; strukturer; metamorfos; berggrund; södra Norge; Earth and Environmental Sciences;

    Abstract : The island of Flekkerøy outside Kristiansand, southern Norway, consists of meta-greywacke, amphibolitic gneiss, granitic gneiss, tonalitic gneiss, hornblenditic mafite, pegmatite and metadolerite. The oldest rocks were probably formed around 1.5 Ga in an arc environment. During the Sveconorwegian orogeny, 1. READ MORE

  6. 5. First precise U-Pb ages of mafic dykes from the São Francisco Craton : initial barcoding of the São Francisco-Congo Craton

    University essay from Lunds universitet/Geologiska institutionen

    Author : Eduardo Miranda da Silveira; [2011]
    Keywords : São Francisco Craton; Congo Craton; mafic intrusions; U-Pb baddeleyite; geochronology; São Francisco kraton; Congo kraton; diabas; U-Pb; baddeleyit; geokronologi; Earth and Environmental Sciences;

    Abstract : São Francisco-kratonen i Sydamerika är en mycket gammal landmassa som bär spår av upprepade extensionella händelser då magmor från manteln transporterades uppåt och kristalliserade som diabas. Tidigare försök att åldersbestämma dessa gångbergarter är få och begränsade till radiometriska metoder som är känsliga för metamorfos och vittring. READ MORE