Sökning: "shocked quartz"

Visar resultat 1 - 5 av 6 uppsatser innehållade orden shocked quartz.

  1. 1. Petrography of impactites from the Dellen impact structure, Sweden

    Master-uppsats, Lunds universitet/Geologiska institutionen

    Författare :Robert Mroczek; [2023]
    Nyckelord :Dellen; Impact; structure; magnetite; apatite; shock waves; shock-metamorphic; features; Impactite; petrography; scanning electron microscope; SEM; geology; Earth and Environmental Sciences;

    Sammanfattning : Identification and characterization of shock-metamorphic features in hypervelocity impact craters is important for our understanding of how shock waves interact with geologic materials and how impact craters form, which in turn is essential to our understanding of what role impact cratering played in the development of our solar system. Of particular interest are accessory minerals like apatite, which contains various volatiles that can affect the atmosphere of a body, or magnetite whose magnetic properties constitute a remote sensing indicator which allows us to study and understand the internal structures of distant bodies. LÄS MER

  3. 2. Electron Backscatter Diffraction (EBSD) Analysis and Predicted Physical Properties of Shocked Quartz from the Chicxulub Impact Crater, Mexico

    Master-uppsats, Uppsala universitet/Institutionen för geovetenskaper

    Författare :Erina Prastyani; [2022]
    Nyckelord :EBSD; SEM; shocked quartz; quartz; CPO; seismic velocity; anisotropy; Chicxulub; impact crater; pole figures; MTEX toolbox; microstructural features; planar deformation feature; planar fracture; feather features;

    Sammanfattning : As one of the most common minerals in crustal rocks, quartz has been widely used as an indicator for shock metamorphism. Shocked quartz is found in the Chicxulub impact crater, an impact crater that has been linked to the Cretaceous-Tertiary extinction ~66 million years ago. LÄS MER

  4. 3. Impactites from the Hiawatha crater, North-West Greenland

    Master-uppsats, Stockholms universitet/Institutionen för geologiska vetenskaper

    Författare :Jacob Gustafsson; [2020]
    Nyckelord :Hiawatha; impact crater; Cape York; Baffin Bay; Greenland Ice Sheet; Younger Dryas; meteorite; impactite; organic carbon; conifer; vitrinite reflectance; Ro; cellular texture; chromite; chromium isotope; toasted quartz; ballen quartz; melted carbonate; granular zircon; planar deformation feature;

    Sammanfattning : The recent discovery of the 31-km-wide Hiawatha impact crater has raised unanswered questions about its age, impactor and highly unusual organic carbon component. Previous research suggests a fractionated iron meteorite impactor, a probable maximum 3–2.4 Ma impact age and a possible Younger Dryas impact age. LÄS MER

  5. 4. Spår av himlakroppskollisioner : bergarter i nedslagskratrar med fokus på Mien, Småland

    Kandidat-uppsats, Lunds universitet/Geologiska institutionen

    Författare :Markus Rosvall; [2016]
    Nyckelord :nedslagsbreccia; nedslagssmälta; Mien; suevit; impaktit; Earth and Environmental Sciences;

    Sammanfattning : This study aims to describe the different types of impactites that are present on Earth and to characterize previously undescribed samples of impactites from Mien, an impact structure located in southern Sweden. Impactites are rocks that are generated from one or several meteoric impacts and they are divided into three groups; shocked rocks, impact breccias and impact melts. LÄS MER

  7. 5. Paleontologiska och impaktrelaterade studier av ett anomalt lerlager i Schweiz

    Kandidat-uppsats, Lunds universitet/Geologiska institutionen

    Författare :Malin Redmo; [2014]
    Nyckelord :Schweiziska Molasbassängen; nedslag; utkastat material; paleoklimat; fossil; chockad kvarts; avsättningsmiljö; Earth and Environmental Sciences;

    Sammanfattning : I detta arbete har paleontologiska och impaktrelaterade studier gjorts på ett sedimentprov taget från ett anomalt rött lerlager i Schweiz. Lerlagret hör till den övre sötvattensmolassen och är avsatt för ca 14Ma.Då man i andra närliggande och samtida avlagringar hittat chockad kvarts och s.k. LÄS MER