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Electron microscopy of olivine with perfect cleavage

Kutty, TRN and Subbanna, GN and Iyer, Anantha GV (1983) Electron microscopy of olivine with perfect cleavage. In: Earth and Planetary Sciences, 92 (3). pp. 283-295.

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Electron microscopy (SEM and TEM) of unusual olivine(Fo = 8X)crystals, with perfect (010) clenvages. from Chalk Hills Salem, Tamil Nadu has hem carried out. SEM studies reveal the effect of compressive stress. Microstructures by TFM showed the abundance of curved dislocations with joga, kinks and dipolea, indicative of the dominant climb, harxcteristic of high temperature deformation. The stackingfault fringes ohserved in olivine are due to mechanical weakening caused by nonstructural chemical constituents. Thc evidences for this come from fluid microinclusions observed and higher amount of K, Na,Rb and Sr in the olivine. Hydrolytic weakning through dislocation glide motion,assisted by H-O containing incompatible elements. may break the metal-oxygen bonds. This leads to perfect parting of crystallographic planes under deformation stress, during solid emplacement of thc dunite. The easily cleavable planes are those with a largest interplanar spacings.

Item Type: Journal Article
Publication: Earth and Planetary Sciences
Publisher: Indian Academy of Sciences
Additional Information: Copyright of this article belongs to Indian Academy of Sciences
Keywords: olivine minerals;Electron microscopy;deformation;Perfect cleavage
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited: 25 Mar 2008
Last Modified: 19 Sep 2010 04:43
URI: http://eprints.iisc.ac.in/id/eprint/13461

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