title: Shock-produced olivine glass: first observation.
abstract: Transmission electron microscope (TEM) observations of an experimentally shock-deformed single crystal of natural peridot, (Mg(0.88)Fe(0.12))(2)SiO(4), recovered from peak pressures of about 56 x 10(9) pascals revealed the presence of amorphous zones located within crystalline regions with a high density of tangled dislocations. This is the first reported observation of olivine glass. The shocked sample exhibits a wide variation in the degree of shock deformation on a small scale, and the glass appears to be intimately associated with the highest density of dislocations. This study suggests that olivine glass may be formed as a result of shock at pressures above about 50 to 55 x 10(9) pascals and that further TEM observations of naturally shocked olivines may demonstrate the presence of glass.
authors.forename: R
authors.initials: R
authors.lastname: Jeanloz
authors.forename: T J
authors.initials: TJ
authors.lastname: Ahrens
authors.forename: J S
authors.initials: JS
authors.lastname: Lally
authors.forename: G L
authors.initials: GL
authors.lastname: Nord
authors.forename: J M
authors.initials: JM
authors.lastname: Christie
authors.forename: A H
authors.initials: AH
authors.lastname: Heuer