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

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. Classification of four mesosiderites and implications for their formation

   Master-uppsats, Lunds universitet/Geologiska institutionen

   Författare :Gabriel Zachén; [2020]
   Nyckelord :mesosiderites; meteorites; stony-irons; classification; textures shock; emulsion; melt droplet; Lamont Acfer 265; QUE 86900; MAC 88102; Earth and Environmental Sciences;

   Sammanfattning : Mesosiderites are rare stony-iron meteorites with enigmatic origins. Their unusual mix of crustal and core materials have inspired many formation theories over the last century. LÄS MER

5. 4. Shock metamorphic features in zircon grains from the Mien impact structure : clues to conditions during impact

   Master-uppsats, Lunds universitet/Geologiska institutionen

   Författare :Josefin Martell; [2018]
   Nyckelord :Zircon; shock metamorphism; Mien; FRGN zircon; granular texture; Earth and Environmental Sciences;

   Sammanfattning : Jämfört med andra himlakroppar i vårt solsystem så finns det få välbevarade nedslagsstrukturer på jorden. Vi vet att jorden har påverkats av nedslag från rymden i lika stor utsträckning som övriga planeter och att dessa nedslag har influerat jordens geologiska och biologiska utveckling. LÄS MER

7. 5. 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