Sökning: "sedimentary structures"

Visar resultat 1 - 5 av 21 uppsatser innehållade orden sedimentary structures.

  1. 1. The Origins and Ecology of Early Paleozoic Spreiten Ichnofossils: Comparisons of Daedalus and Syringomorpha with Alectorurus

    Magister-uppsats, Uppsala universitet/Institutionen för geovetenskaper

    Författare :Zane Goodell; [2023]
    Nyckelord :trace fossils; ichnology; Cambrian; Daedalus desglandi; Alectorurus circinatus; Syringomorpha nilssoni; the agronomic revolution;

    Sammanfattning : The Cambrian explosion not only shaped the ecosystems of the Phanerozoic, but fundamentally changed how biota interacts with the environment, including the substrate. Cambrian trace fossils Alectorurus and Syringomorpha as well as Ordovician-Silurian Daedalus represent novel modes of faunal interaction with the newly innovated shallow marine mixed-ground and have surprisingly limited stratigraphic ranges. LÄS MER

  3. 2. Geologisk och geokemisk analys av 2 miljarder år gamla stromatoliter och kimberlit/lamprofyr från Kalix

    Kandidat-uppsats, Uppsala universitet/Institutionen för geovetenskaper

    Författare :Elin Waara; [2023]
    Nyckelord :Western Gräddmanhällan; greenstone belt; stromatolite; kimberlite; lamprophyre; Västra Gräddmanhällan; grönstensbälte; stromatolit; kimberlit; lamprofyr;

    Sammanfattning : Den övergripande tanken med projektet är att ta reda på vad som hände på Västra Gräddmanhällan,utanför Kalix kust, för 2 miljarder år sedan. Det görs genom att ta reda på vad det är för bergarter ochstrukturer som hittats på området och hur de korrelerar till varandra. LÄS MER

  4. 3. Sedimentary Factories and Ecosystem Change in the Triassic-Jurassic Boundary Interval : Insights from the Skåne Area (Southern Sweden)

    Master-uppsats, Uppsala universitet/Paleobiologi

    Författare :Gustav Nesset Mattsson; [2021]
    Nyckelord :CAMP; microbial structures; End-Triassic extinction event; sedimentary structures; MISS; Triassic-Jurassic boundary; CAMP; mikrobiella strukturer; Trias-jura-utdöendet; sedimentära strukturer; MISS; Trias- juragränsen;

    Sammanfattning : The End-Triassic Extinction (ETE) has long remained one of the lesser known among the so-called “Big Five”. There exist several hypotheses regarding the probable cause of this extinction, which can mainly be divided into  events of  a decline in the rate of diversification  in the late Triassic contra a sudden and significant extinction event. LÄS MER

  5. 4. First-arrival traveltime tomography of active-source data in the Kansanshi copper mine, northern Zambia

    Magister-uppsats, Uppsala universitet/Geofysik

    Författare :Vessela Hobson; [2019]
    Nyckelord :refraction seismics; tomographic inversion; Zambian Copperbelt; copper;

    Sammanfattning : Sedimentary rock-hosted deposits are a major source of copper and cobalt, with the Neoproterozoic central African Copperbelt being among the largest Cu-Co provinces in the world, accounting for around 15% of its copper resource. The deposits occur primarily in the carbonates and siliciclastic sediments overlying the basement, and formed during early diagenesis (around 820 Ma) and late diagenesis/metamorphism during the Pan-African Orogeny (580-520 Ma). LÄS MER

  7. 5. EGS : Framtidens Geotermiska System

    Kandidat-uppsats, Lunds universitet/Geologiska institutionen

    Författare :Hanna Kervall; [2017]
    Nyckelord :EGS; hydroshearing; hydraulisk hammarborrteknik; granitisk berggrund; Newberry; Earth and Environmental Sciences;

    Sammanfattning : The increasing demand for eco-friendly energy alternatives and the changing requirements of state of the art EGS-plants (Enhanced Geothermal Systems) have set the mark for many countries to start evaluating their geothermal assets. By using the EGS-technique, artificial reservoir providing district heating and electricity are created around the world by stimulating the bedrock hydrostatically with a process called hydroshearing. LÄS MER