Sökning: "deep weathering"

Hittade 4 uppsatser innehållade orden deep weathering.

  1. 1. Cenozoic history of North Atlantic deep sea carbonate preservation

    Kandidat-uppsats, Stockholms universitet/Institutionen för geologiska vetenskaper

    Författare :Marcus Länje; [2015]
    Nyckelord :Carbonate compensation depth; CCD; IODP; ODP; DSDP; Atlantic Ocean; subsidence modeling; Cenozoic; database of sediment lithologies; Google Earth;

    Sammanfattning : Carbonate preservation in the oceans occurs at a depth called the carbonate compensation depth (CCD). The CCD is where the input rate of carbonate from the surface of the ocean is balanced by the dissolution rate. LÄS MER

  3. 2. Oil occurrences in crystalline basement rocks, southern Norway : comparison with deeply weathered basement rocks in southern Sweden

    Kandidat-uppsats, Lunds universitet/Geologiska institutionen

    Författare :Linnéa Gunterberg; [2013]
    Nyckelord :deep weathering; petroleum; crystalline basement; saprolite; kristallin berggrund; djupvittring; Earth and Environmental Sciences;

    Sammanfattning : Ökande oljepriser och en stigande efterfrågan gör idag undersökningar av alternativa petroleumreservoarer extra intressanta. Istället för att borra i den sedimentära berggrunden ges nu möjligheten att granska kristallina berggrundsreservoarer. LÄS MER

  4. 3. Sediment variations in the Kuchi Lake, southern Taiwan: : Climate signal or tectonics?

    Kandidat-uppsats, Institutionen för geologiska vetenskaper

    Författare :Oscar Fransner; [2011]
    Nyckelord :Taiwan; Kuchi Lake; climate archive; sediment core; XRF;

    Sammanfattning : Climate archives are of greatest significance when it comes to paleoclimate studies, since these types of archives in a natural way have registered and preserved the conditions of the past. There are several types of climate archives, one of the most commonly used are lake sediments, because lakes can reveal different types of information, for example weathering, vegetation and precipitation. LÄS MER

  5. 4. Aqueous Phase Geochemical Characterization and Delineation of Low Arsenic Aquifers in Matlab Upazila, SE Bangladesh.

    Master-uppsats, KTH/Miljögeokemi och ekoteknik

    Författare :Rajib Hassan Mozumder; [2011]
    Nyckelord :arsenic; Bangladesh; groundwater; mitigation; color tool; aquifer; highstand; lowstand;

    Sammanfattning : The fact that the former highstand whitish sediments of Plio-Pleistocene and lowstand off-white/red sediments of Late Pleistocene containing low As concentrations in the Bengal basin forms the premise for developing a color tool by the ‘Sustainable Arsenic Mitigation Project’ (SASMIT) to guide the local drillers of Matlab, SE Bangladesh, so that they can target low As aquifers. Groundwater samples collected from the black group of sediments representing a highly reducing environment contains very high concentrations of As, Fe2+ , NH4+, PO43-, HCO3–, and DOC and very low SO42- and Mn2+ concentrations; and vice-versa for the red/offwhite/white group of sediments, thus representing a less reducing condition. LÄS MER