Kink-Bands: Shock Deformation of Biotite Resulting from a Nuclear Explosion

Science  14 May 1965:
Vol. 148, Issue 3672, pp. 950-952
DOI: 10.1126/science.148.3672.950


Microscopic examination of granodiorite samples from the shock region around a nuclear explosion reveals sharply folded lens-shaped zones (kink-bands) in the mineral biotite. Fifty percent of these zones are oriented approximately 90° to the direction of shock-wave propagation, but other zones are symmetrically concentrated at shear angles of 50° and 70° to the direction of shock-wave propagation.