Dislocation microstructures in naturally deformed silicate garnets

Details Dislocation microstructures in naturally deformed silicate garnets Dislocation microstructures in naturally deformed silicate garnets

Nov 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993pepi...80..105a&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 80, Issue 3-4, p. 105-116.

Physics

14

Scientific paper

Dislocation microstructures of naturally deformed silicate garnets and olivines in garnet-peridotites and silicate garnets in eclogites from four localities have been observed with a transmission electron microscope (TEM) to clarify the dislocation characteristics of silicate garnets. We have obtained the following results: (1) dislocation densities of garnets in all the garnet-peridotites (ρ = 105-107 cm-2) are always nearly an order of magnitude lower than those of co-existing olivines; (2) dislocation densities of garnets in eclogites (ρ = 105-108 cm-2) which are embedded in garnet-peridotites are almost an order of magnitude higher than those of garnets in the surrounding garnet-peridotites; (3) the dominant Burgers vector, b, of mainly edge dislocations in garnet is <100> for specimens with dislocation density ρ = 105-106 cm-2, while b=1/2<111> for specimens with ρ = 107-108 cm-2. Result (1) indicates that the observed dislocations in garnets were formed by plastic deformation under the same stresses as for co-existing olivines, and that there is a similar relationship between applied stress and dislocation density for garnets as for olivines. Result (2) suggests that the stress concentration occurred around eclogites embedded in garnet-peridotites, and the resulting differential stress in garnets in eclogites was further elevated by the interlocking of neighboring hard garnet grains. Finally, result (3) indicates that the dominant Burgers vector of mainly edge dislocations in garnet changes from <100> to 1/2<111> with increasing applied differential stress.
Present address: Department of Earth and Planetary Systems Science, Faculty of Science, Hiroshima University, Higashi-Hiroshima 724, Japan.

Affiliated with

Also associated with

No associations

Rating

Dislocation microstructures in naturally deformed silicate garnets does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Dislocation microstructures in naturally deformed silicate garnets, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dislocation microstructures in naturally deformed silicate garnets will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-813054