Original paper
Structural deformation of experimentally shock-loaded biotites
Schneider, H.; Hornemann, U.
Neues Jahrbuch für Mineralogie - Monatshefte Jg. 1974 Heft 3-4 (1974), p. 149 - 162
14 references
published: Jul 5, 1974
DOI: 10.1127/njmm/1974/1974/149
ArtNo. ESP156197403006, Price: 19.00 €
Abstract
Dynamic compression experiments from 200 kbar up to 560 kbar were carried out on biotite single crystals. Shock front direction was [001]. Deformation is not very intensive up to 400 kbar. Higher shock pressures make the intersheet cations (K+) leave their fixed lattice positions. A part of the octahedrally coordinated Mg2+- and Fe2+-cations now are randomly spread out parallel to different crystallographic planes, whereas the oxygen network of the mica remains intact. The strong shock compressions may also cause disordering of silicon and aluminium within the tetrahedra. Dynamic pressures higher than 480 kbar effect an extensive mosaicism of the single crystals. Deformation takes place by means of preferred gliding parallel to special gliding planes. At 560 kbar nearly the whole biotite specimen becomes amorphous and glasslike. This biotite glass is supposed to be produced by shock compression and/or rarefraction and not by temperature effects.
Keywords
Experiment • monoaxial compression • biotite • infrared spectrography • monocristal diffraction