TEM observation of dissociated dislocations with b = [010] in naturally deformed olivine

Details TEM observation of dissociated dislocations with b = [010] in naturally deformed olivine TEM observation of dissociated dislocations with b = [010] in naturally deformed olivine

Jun 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993pepi...78..131f&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 78, Issue 1-2, p. 131-137.

Physics

2

Scientific paper

Naturally deformed olivine specimens from the mylonitized and recrystallized Uenzaru peridotite in the Hidaka metamorphic belt, northern Japan, have been examined by high-resolution transmission electron microscopy (HRTEM). The olivine grains have a high density (approximately 1012 m-2) of [100] dislocations, a moderate density (approximately 1011 m-2) of [001] dislocations and a low density (<= 1010 m-2) of [010] dislocations.
High-resolution lattice-fringe images revealed that the [010] edge dislocations parallel to [100] are split into partial dislocations according to one of the following two dissociation reactions: [010] = 1/4[011] + 1/4[011] + 1/4[011] + 1/4[011], with stacking faults parallel to the (021), (010) and (021) planes; [010] = 1/4[011] + 1/4[011] + 1/2[011], with stacking faults parallel to (021) and (021). The separation between partials ranges from 5 to 10 nm. Displacement vectors of the type 1/4<011> preserve the hexagonal close packing of oxygens in the olivine structure, and stacking fault planes of the type {021} and (010) do not cut the strong Si-O bonds. The geometrical configurations of the partial dislocations indicate that they formed by climb dissociation. Based on the geometrical structures observed for the dissociation of [010] dislocations, a possible structure is proposed for dissociated [001] dislocations.

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