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Dislocations in meteoritic and synthetic majorite garnets

¹ Laboratoire de Structure et Propriétés de Etat Solide - ESA CNRS 8008, Université des Sciences et Technologies de Lille, 59655 Villeneuve d'Ascq Cedex, France
² Bayerisches Geoinstitut, Universität Bayreuth, 95440 Bayreuth, Germany
^# Present address: GeoForschungsZentrum Potsdam, Aufgabenbereich 3.2, Telegrafenberg, 14473 Potsdam, Germany

e-mail: Patrick.Cordier{at}univ-lillel.fr

Shock veins in the Acfer 90072, L5/6 (S6) chondrite contain polycrystalline fragments constituted of ringwoodite and majorite. The dislocation microstructures of the majorite crystals have been characterised by transmission electron microscopy and large-angle convergent-beam electron diffraction. Most of the dislocations form sub-grain boundaries organised in cells. Some free dislocations can be found in the cells. Dislocations with 1/2<111> and <100> Burgers vectors have been characterised. These microstructures compare well with those observed in majorite synthesised from a glass in multi-anvil experiments. These observations suggest that the dislocation microstructures observed in both synthetic and meteoritic majorite result from imperfect growth.

Key-words: majorite, garnet, meteorite, shock veins, dislocation, TEM, LACBED.

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