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Shear sense indicator > Sigma-clast
PREFERRED TERM
Sigma-clast  
DEFINITION
  • A mantled porphyroclast (i.e. a porphyroclast with a mantle of fine recrystallised grains of the same composition as the clast, elongated in the direction of the foliation) with an asymmetric form resembling the Greek letter sigma (modified from Passchier & Trouw, 1996).
BROADER CONCEPT
CONTRIBUTOR
  • ebnmar
CREATOR
  • ebnmar
IN OTHER LANGUAGES
Sigma-Klast

German

URI
http://resource.geolba.ac.at/structure/41
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