Sökning: "Miocen"

Hittade 5 uppsatser innehållade ordet Miocen.

  1. 1. The Biogeographical Extent and Global Synchronicity of the Late Miocene Reticulofenestra pseudoumbilicus Paracme

    Master-uppsats, Uppsala universitet/Institutionen för geovetenskaper

    Författare :Joseph Asanbe; [2022]
    Nyckelord :late Miocene; biogenic bloom; nannofossil biostratigraphy; paleo-productivity; Reticulofenestra size variation;

    Sammanfattning : Previous biostratigraphic studies in the Indian Ocean, equatorial Pacific, Atlantic Ocean and the Caribbean Sea document the temporal disappearance of Reticulofenestra pseudoumbilicus in the late Miocene (Tortonian age). This interval has been subsequently defined as the R. pseudoumbilicus paracme. LÄS MER

  3. 2. Relating early Human evolution to late Miocene - early Pliocene climate change

    Master-uppsats, Uppsala universitet/Institutionen för geovetenskaper

    Författare :Tika van Galen; [2020]
    Nyckelord :climate; evolution; climate change; hominins; bipedal locomotion; late Miocene; Pliocene;

    Sammanfattning : Human evolution has been linked to climate change multiple times in the literature. One of the more well-known theories is the ‘savannah’ theory, which states that walking upright became an advantageous character when climate in Africa changed causing drier environments, changing woodlands to savannahs. LÄS MER

  4. 3. Investigation into the Loess-Palaeosol and Red Clay Record from the Pliocene- Quaternary Chinese Loess Plateau Using In-Phase and Out-OfPhase Magnetic Susceptibility

    Kandidat-uppsats, Uppsala universitet/Institutionen för geovetenskaper

    Författare :Rebecca Jacobson; [2018]
    Nyckelord :loess; Chinese Loess Plateau; magnetic susceptibility; out-of-phase; viscous relaxation; lössjord; Kinesiska Lössjordsplatån; magnetiska känsligheter; ur-fas; viskös relaxation;

    Sammanfattning : Loess is a well sorted, fine grained, windblown (aeolian) sediment and deposits as a blanket over large areas, reaching from a few centimetres to several hundreds of meters in height and can drape large landscapes in form of mountains. During a more humid and warmer climate, redox conditions are changed in the loess deposits, with greater seasonal moisture creating greater soil formation (pedogenesis), i. LÄS MER

  5. 4. Magma Storage of the Alkaline Tejeda Cone Sheet Swarm, Gran Canaria, Spain

    Master-uppsats, Uppsala universitet/Institutionen för geovetenskaper

    Författare :Max Jensen; [2016]
    Nyckelord :Gran Canaria; Tejeda cone sheet swarm; syenite; magma storage; thermobarometry; clinopyoxene; Gran Canaria; Tejeda inverterade kon-intrusioner; syenit; magma förvar; termobarometri; klinopyroxen;

    Sammanfattning : Volcanoes with alkaline differentiated magma belong to the more explosive and destructive types, but knowledge about these systems is often limited. Unravelling the position and conditions in the source magma chamber systems that feed volcanism at the surface is vital to understand these systems better. LÄS MER

  7. 5. Palynology of Oligocene to middle Miocene sediments from ODP leg 159, site 959 offshore Ivory Coast, equatorial West Africa

    Kandidat-uppsats, Lunds universitet/Geologiska institutionen

    Författare :Elin Hult; [2009]
    Nyckelord :Palynomorphs; Oligocene; Miocene; ODP leg 159 site 959; Ivory Coast; palaeoenvironment; climate; Palynomorfer; Oligocen; Miocen; Elfenbenskusten; palaeomiljö; klimat; Earth and Environmental Sciences;

    Sammanfattning : Oligocen och Miocen karaktäriseras av flera klimatoscillationer som följer de primära Milankovitchcyklerna men varierar i magnitud. Dinoflagellater är känsliga miljöindikatorer såväl som biostratigrafimarkörer, men deras användning som det föregående har i huvudsak varit begränsat till högre latituder. LÄS MER