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Visar resultat 1 - 5 av 6 uppsatser som matchar ovanstående sökkriterier.

  1. 1. Holocene lake-level changes in the Siljan Lake District – Towards validation of von Post’s drainage scenario

    Master-uppsats, Lunds universitet/Geologiska institutionen

    Författare :Savvas Paradeisis-Stathis; [2020]
    Nyckelord :Lake Siljan; Dalarna; basin isolation; catastrophic drainage; early Holocene; lake sediments; XRF scanning; C N ratio; magnetic susceptibility; pollen; Ancylus Lake; Earth and Environmental Sciences;

    Sammanfattning : The Dalarna province in south-central Sweden shows a great variety of geological evidence from the Late Quaternary. A peculiar deglaciation pattern, along with unique hydrological conditions, has left a lot of space for speculations over the palaeoenvironmental conditions during the early Holocene. LÄS MER

  3. 2. A study of shock-metamorphic features in zircon from the Siljan impact structure, Sweden

    Kandidat-uppsats, Lunds universitet/Geologiska institutionen

    Författare :Josefin Martell; [2016]
    Nyckelord :Zircon; impacts; shock metamorphism; shock metamorphic features; planar deformation features; Siljan impact structure; Earth and Environmental Sciences;

    Sammanfattning : Shock-metamorphic features such as planar deformation features (PDFs) and in some cases planar fractures (PFs) are widely used as impact-indicators when to confirm a suspected impact structure. These features only develop when exposed to a sudden and immense pressure and temperature increase in association with meteorite impacts. LÄS MER

  4. 3. Microscopic shock-metamorphic features in crystalline bedrock : a comparison between shocked and unshocked granite from the Siljan impact structure

    Kandidat-uppsats, Lunds universitet/Geologiska institutionen

    Författare :Robert Mroczek; [2014]
    Nyckelord :impact structure; Siljan; planar deformation features; Earth and Environmental Sciences;

    Sammanfattning : During the Devonian, 377 Ma ago, the Earth was impacted by a large celestial body, striking ground in the Siljan area in Dalarna, Sweden. The impact created what is today the largest confirmed impact structure in western Europe. Since its formation, the structure has however been heavily eroded, leaving no trace of the original crater. LÄS MER

  5. 4. Traces of impact in crystalline rock : a summary of processes and products of shock metamorphism in crystalline rock with focus on planar deformation features in feldspars

    Kandidat-uppsats, Lunds universitet/Geologiska institutionen

    Författare :Fredrika Svahn; [2014]
    Nyckelord :Impacts; shock metamorphism; crater formation; shock metamorphic features; planar deformation features; alkali-feldspars; Siljan impact structure; Earth and Environmental Sciences;

    Sammanfattning : Chockmetamorfa strukturer i alkalifältspater har genom studier i polarisationsmikroskop identi-fierats i graniter från Siljan- nedslagskrater. De mikroskopiska strukturer som observerats omfattas av; deformation bands, ladder textures, planar fractures, ”long deformation features", samt planar deformation features (PDFs). LÄS MER

  7. 5. Impact of error : Implementation and evaluation of a spatial model for analysing landscape configuration

    Magister-uppsats, Institutionen för naturgeografi och kvartärgeologi (INK)

    Författare :Marika Wennbom; [2012]
    Nyckelord :remote sensing; error assessment; error; spatial analysis; python; siljan; error matrix; kappa;

    Sammanfattning : Quality and error assessment is an essential part of spatial analysis which with the increasingamount of applications resulting from today’s extensive access to spatial data, such as satelliteimagery and computer power is extra important to address. This study evaluates the impact ofinput errors associated with satellite sensor noise for a spatial method aimed at characterisingaspects of landscapes associated with the historical village structure, called the HybridCharacterisation Model (HCM), that was developed as a tool to monitor sub goals of theSwedish Environmental Goal “A varied agricultural landscape”. LÄS MER