Sökning: "planar deformation features"

Hittade 5 uppsatser innehållade orden planar deformation features.

  1. 1. 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

  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. Hur bildades Bushveldkomplexet?

    Kandidat-uppsats, Lunds universitet/Geologiska institutionen

    Författare :Filip Ivarsson; [2015]
    Nyckelord :chromite; intrusion; platinum; LIP; Bushveld Complex; Earth and Environmental Sciences;

    Sammanfattning : The Bushveld complex is the world’s largest mafic intrusion and located on the Archean Kaapvaal craton, southern Africa. The complex’s host rock has anomalous quantities of platinum-group elements (PGE), chromite and other valuable metals of high demand. LÄS MER

  5. 4. 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

  7. 5. 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