Relation between dislocation density and subgrain size of naturally deformed olivine in peridotites |
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Authors: | Mitsuhiro Toriumi |
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Institution: | (1) University Museum, University of Tokyo, Tokyo, Japan;(2) Present address: Geological Sciences, Faculty of Science, Ehime University, Bunkyo-cho, Japan |
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Abstract: | The subgrain size and the dislocation density of subgrain interiors were measured by the oxidation-decoration method under the optical microscope on naturally deformed olivine from peridotite xenoliths and alpine-type peridotites. Relation of the subgrain size, d and the dislocation density, , within subgrains is represented by the equation, d=15/![radic](/content/vq606664030333gp/xxlarge8730.gif) . Combining with relations of the differential stress and the dislocation density proposed by Kohlstedt and Goetze (1974), relation between the stress ( ) and the subgrain size becomes d=45 Gb/ , where G and b are the rigidity and the magnitude of the Burgers vector of olivine. This relation is in good agreement with those in a simple oxide (MgO), and alkali halides (NaCl, LiF) given by Hüther and Reppich (1973), Poirier (1972), and Streb and Reppich (1973), respectively. |
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