Planar deformation features
Microscopic features of silicate grains
Planar deformation features, or PDFs, are optically recognizable microscopic features in grains of silicate minerals (usually quartz or feldspar), consisting of very narrow planes of glassy material arranged in parallel sets that have distinct orientations with respect to the grain's crystal structure.
PDFs are only produced by extreme shock compressions on the scale of meteor impacts. They are not found in volcanic environments. Their presence therefore is a primary criterion for recognizing that an impact event has occurred.
See also
- Shocked quartz
- Shock metamorphism
References
- http://www.lpi.usra.edu/publications/slidesets/craters/glossary.shtml
- https://www.unb.ca/passc/ImpactDatabase/essay.html
- Langenhorst, F.; Deutsch, A. (1993). "Orientation of Planar Deformation Features (PDFs) in quartz". Lunar and Planetary Science Conference. 24: 849. Bibcode:1993LPI....24..849L.
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- Impact crater
- Impact event
- Acraman
- Amelia Creek
- Araguainha
- Beaverhead
- Boltysh
- Carswell
- Charlevoix
- Chesapeake Bay
- Chicxulub
- Clearwater East and West
- Gosses Bluff
- Haughton
- Kamensk
- Kara
- Karakul
- Keurusselkä
- Lappajärvi
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- Manicouagan
- Manson
- Mistastin
- Mjølnir
- Montagnais
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- Nördlinger Ries
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- Rochechouart
- Saint Martin
- Shoemaker
- Siljan Ring
- Slate Islands
- Steen River
- Strangways
- Sudbury
- Tookoonooka
- Tunnunik
- Vredefort
- Woodleigh
- Yarrabubba
- Alvarez hypothesis
- Australite
- Breccia
- Coesite
- Complex crater
- Cretaceous–Paleogene boundary
- Cryptoexplosion
- Ejecta blanket
- Impact crater
- Impact structure
- Impactite
- Late Heavy Bombardment
- Lechatelierite
- Meteorite
- Moldavite
- Ordovician meteor event
- Philippinite
- Planar deformation features
- Shatter cone
- Shock metamorphism
- Shocked quartz
- Stishovite
- Suevite
- Tektite
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