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
(2014) In Dissertation in Geology at Lund university GEOL01 20141Department 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)
Please use this url to cite or link to this publication:
http://lup.lub.lu.se/student-papers/record/4468004
- 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
- 2014
- 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}},
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}},
}