A transmission electron microscope investigation of shock metamorphism in olivine of the ILAFEGH 013 chondrite

Details A transmission electron microscope investigation of shock metamorphism in olivine of the ILAFEGH 013 chondrite A transmission electron microscope investigation of shock metamorphism in olivine of the ILAFEGH 013 chondrite

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997m%26ps...32..309j&link_type=abstract

Meteoritics, vol. 32, pages 309-316

Computer Science

6

Scientific paper

Ilafegh 013 is a slightly weathered, type 3 ordinary chondrite which is unusual as it is highly shocked. Olivine grains in chondrules were studied in detail by transmission electron microscopy to characterize the dislocations, fractures and recrystallization textures. Only c dislocations, in the (010) glide plane, seem to be activated by the shock wave. Fractures are more numerous in the TEM than at the scale of the optical microscope. They can be divided into two groups: (a) open fractures with injections of molten metal, sulphide, and in some cases, phases containing Ca, Al, Na and K. (b) Very straight and narrow cracks parallel to {130} planes without injected material, consisting of imperfectly relaxed subgrain boundaries composed of two families of dislocations (Burgers vectors a and c). Both types of dislocations are roughly screw, i.e. the subgrain boundaries have a pronounced twist character. It is suggested that they formed during the shock in order to relax stresses around shear fractures (fractures with displacements of their walls parallel to the fracture plane). Recrystallization occurs in areas where the dislocation density is high. Since diaplectic glass was not detected, it is suggested that recrystallization results from the large elastic energy of the lattice defects stored in the deformed crystals.

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