Naturally decorated dislocations in olivine from peridotite xenoliths |
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| Authors: | David H Zeuch Harry W Green II |
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| Institution: | (1) Department of Geology, University of California, 95616 Davis, California, USA |
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| Abstract: | Dislocations decorated by hematite and magnetite have been observed optically in the olivine grains of undeformed or highly annealed peridotite xenoliths from Hawaii and Baja California (  5 × 105 cm–2). The observed structures include loops, low-angle boundaries, and structures produced by multiple cross-glide of 100] screws. Loops are almost invariably parallel to (001). Simple arrays of parallel dislocations lie predominantly in (100), (010) and (001) with dislocation lines subparallel to low-index directions. 100] screws pinned to (100) boundaries are frequently seen to bow out on (001). Preliminary electron petrography has confirmed that all dislocations are decorated. |
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