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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

Svahn, Fredrika LU (2014) In Dissertation in Geology at Lund university GEOL01 20141
Department of Geology
Abstract (Swedish)
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). Stufferna härstammar från samma bergart, Järna graniten, från olika tryckintervaller inom siljankratern. Studiens resultat varierar för prover från olika tryckintervall, en avsevärd större mängd deformations strukturer återfanns i provet som beräknas tillhöra det högsta tryckintervallet 15-20 GPa. Long deformation features och Planar deformation features är de enda deformations strukturer som observerats i prover från det... (More)
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). Stufferna härstammar från samma bergart, Järna graniten, från olika tryckintervaller inom siljankratern. Studiens resultat varierar för prover från olika tryckintervall, en avsevärd större mängd deformations strukturer återfanns i provet som beräknas tillhöra det högsta tryckintervallet 15-20 GPa. Long deformation features och Planar deformation features är de enda deformations strukturer som observerats i prover från det lägre tryckintervallet 10-15 Gpa. Provet från det högsta tryckintervallet visade sig även innehålla en mycket större diversitet av deformationsstrukturer. (Less)
Abstract
Shock metamorphic features have been identified in alkali feldspars within granitic rock samples from the Siljan impact structure in Sweden. Observed features include deformation bands, ladder textures, “V-textures” planar fractures, “long deformation features”, and true planar deformation features (PDFs). The studied samples are of the same lithology but come from different shock pressure intervals and the results vary for samples within different pressure intervals. The majority of the deformation features have been observed in the sample from the highest shock pressure interval; 15-20 GPa. Long deformation features and planar deformation features are the only two deformation features observed in samples from the lower shock pressure... (More)
Shock metamorphic features have been identified in alkali feldspars within granitic rock samples from the Siljan impact structure in Sweden. Observed features include deformation bands, ladder textures, “V-textures” planar fractures, “long deformation features”, and true planar deformation features (PDFs). The studied samples are of the same lithology but come from different shock pressure intervals and the results vary for samples within different pressure intervals. The majority of the deformation features have been observed in the sample from the highest shock pressure interval; 15-20 GPa. Long deformation features and planar deformation features are the only two deformation features observed in samples from the lower shock pressure interval 10-15 GPa. A much higher fre-quency of deformation structures have also been observed in the sample derived from the highest pressure interval. (Less)
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author
Svahn, Fredrika LU
supervisor
organization
alternative title
Spår av impakt i kristallin berggrund : en sammanfattning av processer och produkter relaterade till chockmetamorfos med särskild fokus på deformationsstrukturer i fältspater
course
GEOL01 20141
year
type
M2 - Bachelor Degree
subject
keywords
Impacts, shock metamorphism, crater formation, shock metamorphic features, planar deformation features, alkali-feldspars, Siljan impact structure
publication/series
Dissertation in Geology at Lund university
report number
391
language
English
id
4468004
date added to LUP
2014-06-24 16:38:26
date last changed
2014-06-24 16:38:26
@misc{4468004,
  abstract     = {Shock metamorphic features have been identified in alkali feldspars within granitic rock samples from the Siljan impact structure in Sweden. Observed features include deformation bands, ladder textures, “V-textures” planar fractures, “long deformation features”, and true planar deformation features (PDFs). The studied samples are of the same lithology but come from different shock pressure intervals and the results vary for samples within different pressure intervals. The majority of the deformation features have been observed in the sample from the highest shock pressure interval; 15-20 GPa. Long deformation features and planar deformation features are the only two deformation features observed in samples from the lower shock pressure interval 10-15 GPa. A much higher fre-quency of deformation structures have also been observed in the sample derived from the highest pressure interval.},
  author       = {Svahn, Fredrika},
  keyword      = {Impacts,shock metamorphism,crater formation,shock metamorphic features,planar deformation features,alkali-feldspars,Siljan impact structure},
  language     = {eng},
  note         = {Student Paper},
  series       = {Dissertation in Geology at Lund university},
  title        = {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},
  year         = {2014},
}