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- W3141409206 abstract "The defect microstructure and oxidation state of Fe in metasomatized olivine crystals from peridotite xenoliths from Dish Hill, California, have been studied by transmission electron microscopy (TEM) and Mdssbauer spectroscopy. Previous petrographic studies suggested that these composite xenoliths were metasomatized under upper mantle conditions. Mijssbauer data indicate that between I and 60/o of the Fe in the olivine crystals is Fe3*. TEM revealed the presence of layers 0.6 nm wide and parallel to (001) of olivine. The individual layers do not offset the surrounding olivine periodicities and are interpreted to be laihunite, an Fe3* derivative of olivine, rather than humite-group minerals. The layers are found in (l) strong association with dislocations, with abundances decreasing rapidly with distance from the dislocation cores, (2) at grain boundaries, where layers of considerable length decrease in abundance with distance from the grain boundary, and (3) in local regions, where discontinuous layers, possibly formed by homogeneous nucleation, are evenly distributed throughout the olivine. These patterns suggest hat the layers formed by alteration of olivine. TEM images from many areas revealed a very fine domain structure (l0 to 20 nm in diameter), possibly indicating short-range order ofFe3* and vacancies. Some dislocations are associated with trails of submicrometer-sized fluid inclusions that contain iron oxide crystals a few tens of nanometers wide. These features may be healed fractures that provided pathways for oxidized Fe-bearing fluids. The association between laihunite and dislocations probably reflects the role ofdislocations as rapid diffusion pathways and as sites for heterogeneous nucleation in olivine that is supersaturated with respect to Fe3*. The subsequent reactivity, rheological, and transport properties of olivine may be modified substantially by laihunite layers on dislocations and at grain boundaries." @default.
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- W3141409206 date "2007-01-01" @default.
- W3141409206 modified "2023-09-27" @default.
- W3141409206 title "The defect microstructure of oxidized mantle olivine from Dish Hill, California" @default.
- W3141409206 hasPublicationYear "2007" @default.
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