gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1978.042.321.05 Investigations on the Deformation of Experimentally Shock-Loaded Biotites Using X-Ray Single Crystal Diffraction Techniques Schneider Hartmut Mineralogisches Institut der Universität Karlsruhe, Germany1

Present address: Forschungsinstitut der Feuerfestindustrie, An der Elisabethkirche 27, 5300 Bonn, Germany.

 3 1978 42 321 41 44 26 5 1977 28 8 1977 Copyright © 1978, The Mineralogical Society 1978 Summary

The deformation of biotite single crystals submitted to experimental shock-pressures of about 200 and 400 kb with direction of the shock wave parallel to [001] was investigated by X-ray precession and Weissenberg techniques. The X-ray analysis reveals a ‘fracturing’ of the biotite crystals upon pressure release into relatively large lattice blocks (> 1000 Å), which increases with the degree of shock compression. Deformation is inferred to take place by gliding and/or microfracturing processes parallel to the (010) and (110) lattice planes. Chains of tetrahedra running parallel to [100] and [110] probably exert a controlling influence on shock deformation mechanisms.