Search for dissertations about: "tephrochronology"

Showing result 1 - 5 of 9 swedish dissertations containing the word tephrochronology.

  1. 1. Tephra horizons in the North Atlantic region during the Early Holocene

    University dissertation from Stockholm : Department of Physical Geography and Quaternary Geology, Stockholm University

    Author : Ewa Lind; Stockholms universitet.; [2014]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Tephrochronology; geochemical composition; Saksunarvatn Ash; Vedde Ash; Fosen Tephra; Askja-S; palaeoclimate; Younger Dryas; Early Holocene; “XRF ITRAX”; sediment geochemistry; stable isotopes; Faroe Islands; Norway; Sweden; Quaternary Geology; kvartärgeologi;

    Abstract : Uncertainties about the rate and magnitude of future climate change have drawn attention to the climate variability following the Late Glacial-Early Holocene transition, c. 12-8 ka BP. READ MORE

  2. 2. Tree-limit ecotonal response to Holocene climate change in the Scandes Mountains of west-central Sweden

    University dissertation from Department of Geology, Lund University

    Author : Jonas Bergman; Lunds universitet.; Lund University.; [2005]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; tree-limit ecotone; alpine vegetation; tephrochronology; peat humification; plant macrofossils; Palaeobotany; fylogeni; Paleobotanik; palynology; phylogeny; palynologi; Geologi; Geology; pedology; geomorphology; Physical geography; klimatologi; geomorfologi; climatology; Fysisk geografi; cartography; Holocene climate; palaeoecology; marklära; kartografi; pollen influx;

    Abstract : Popular Abstract in Swedish Under den geologiska period som kallas kvartärtiden (de senaste 2,6 miljoner åren) har flera istider (glacialer) och mellanistider (interglacialer) avlöst varandra enligt ett mönster där glacialerna varar i ungefär 100000 år och mellanistiderna i ca 10000 år. Under istiderna täcktes stora landområden på norra halvklotet, bl. READ MORE

  3. 3. Geology of Lagoa das Furnas, a crater lake on São Miguel, Azores archipelago

    University dissertation from Stockholm : Department of Geological Sciences, Stockholm University

    Author : Thommy Andersson; Stockholms universitet.; [2015]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Lagoa das Furnas; Azores; crater lake; geophysical mapping; tephrochronology; volcanic dome; maringeologi; Marine Geology;

    Abstract : In this thesis, the results from a geophysical mapping and coring campaign of Lagoa das Furnas are presented. Specific focus is placed on the origin of a subaqueous volcanic cone mapped in the southern part of the lake. READ MORE

  4. 4. Setting the Holocene clock using varved lake sediments in Sweden

    University dissertation from Quaternary Sciences, Department of Geology, Lund University

    Author : Lovisa Zillén; Lunds universitet.; Lund University.; [2003]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; climate change; Physical geography; tephrochronology; palaeomagnetic secular variations; radiocarbon time-scale; Holocene varved lake sediments; varve chronology; geomorphology; pedology; cartography; climatology; Fysisk geografi; geomorfologi; marklära; kartografi; klimatologi;

    Abstract : Popular Abstract in Swedish Under kvartärtiden (den geologiska period som omfattar de senaste ca 2,6 miljoner åren) har klimatet på Jorden varierat dramatiskt. Långa perioder (ca 100 000 år) av istid med stora inlandsisar som täckte Skandinavien, Ryssland, Sibirien, Grönland och Nordamerika har periodiskt avbrutits av kortare perioder (ca 10 000 år) av varmare klimat, så kallade interglacialer. READ MORE

  5. 5. Towards a Holocene tephrochronology for the Azores

    University dissertation from Stockholm : Department of Physical Geography, Stockholm University

    Author : Hans Johansson; Stockholms universitet.; [2015]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Quaternary Geology; kvartärgeologi;

    Abstract : The Azores is situated in the North Atlantic Ocean and is one of the most active volcanicregions in the Northern Hemisphere. The volcanic history of the islands is fairly wellknown and several explosive trachytic eruptions have been reported but the geochemicalcompositions of the glass component of the tephra as well as the dispersal oftephras to distal areas are less well known. READ MORE