Search for dissertations about: "Cenozoic"

Showing result 1 - 5 of 27 swedish dissertations containing the word Cenozoic.

  2. 1. The flux of extraterrestrial spinels to Earth associated with He-3 anomalies in Cenozoic and Ordovician sediments

    Author : Samuele Boschi; Kärnfysik; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Chromite; He-3 anomaly; Cenozoic; mid-Ordovician; asteroid breakup; ordinary chondrites; Popigai ejecta; iridium anomaly; Zircons; ice age;

    Abstract : The main goal of this thesis is to reconstruct the flux of extraterrestrial matter to Earth in specific time intervals of our past in order to add an astronomical dimension to the understanding of Earth's history. To accomplish this, extraterrestrial chrome-spinel grains have been extracted and analysed. READ MORE

  4. 2. Systematics and assessment of the chemosynthetic bivalve family Vesicomyidae

    Author : Frida Hybertsen; Steffen Kiel; Helen Coxall; Elizabeth Harper; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Cenozoic; deep sea; hydrocarbon seeps; chemosynthetic; Bivalvia; Vesicomyidae; maringeologi; Marine Geology;

    Abstract : The deep ocean has fascinated researchers for centuries with discoveries of new ecosystems and species, yet there are still many biogeographic and evolutionary questions unanswered. Along active and passive tectonic margins, specialized ecologies thrive in a symbiosis between chemosynthesizing bacteria and their host animals. READ MORE

  5. 3. Phylogeny and macroevolution in Isoetes (Isoetales)

    Author : Eva Larsén; Catarina Rydin; Niklas Wikström; Ove Eriksson; Richard Bateman; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Bayesian inference; biogeography; Cenozoic; genomic data; fossil calibration; Isoetes; Isoetales; megaspore morphology; Mesozoic; molecular clocks; node ages; phylogeny; rhizomorphic lycopsids; scanning electron microscopy; Plant Systematics; växtsystematik;

    Abstract : This thesis has focused on the evolutionary history of Isoetes (Isoetales, Lycopsida), its phylogeny, megaspore morphology and evolutionary path through deep time. With a broadened sampling of species to include more of the worldwide diversity of the genus compared to previous work an unexpected sister to the rest of the genus was found. READ MORE

  6. 4. Marine silicon cycle through the Cenozoic

    Author : Guillaume Fontorbe; Kvartärgeologi; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Si isotopes; Paleogene; PETM; glacial-interglacial; ocean circulation;

    Abstract : Silicon (Si) cycle is one of Earth's major biogeochemical cycles. Furthermore, the dissolved form of Si (DSi) is an essential nutrient for both terrestrial and marine ecosystems. READ MORE

  7. 5. Cenozoic landscape evolution in northern Sweden : Geomorphological interpretation within a GIS-framework

    Author : Karin Ebert; Clas Hättestrand; Paul Bishop; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Long-term geomorphology; northern Sweden; base-level surface; inselbergs; digital elevation models; field observations; Physical geography; Naturgeografi; Physical Geography; naturgeografi;

    Abstract : The large-scale bedrock landscape in northern Sweden has a complex evolution history of planation, uplift, transgression, burial, weathering, and erosion. The aim of this thesis is to examine the long-term development of the area. Terms for base-level surfaces in the area are defined. READ MORE