Accession Number : ADA020040

Title :   Origin of Plastic Deformation in Olivine and Pyroxene.

Descriptive Note : Final rept. 15 Jul 72-30 Jun 75,

Corporate Author : STATE UNIV OF NEW YORK AT STONY BROOK DEPT OF EARTH AND SPACE SCIENCES

Personal Author(s) : Morrison-Smith,Derek ; Carter,Neville ; Prewitt,Charles

Report Date : 01 SEP 1975

Pagination or Media Count : 22

Abstract : Experimentally and naturally deformed olivines, orthopyroxenes and amphiboles have been investigated by transmission electron microscopy to determine the dislocation substructure. Several sets of substructures have been determined and these have been combined with high temperature determinations of the crystal structure in an attempt to explain variations in operative slip system with temperature. This goal has been achieved only partially; a theoretical model was devised to account for twin-gliding in amphiboles and initial work was done in attempting to model the enstatite-clinoenstatite transformation from an energetical point of view. The nature of exsolution lamellae in orthopyroxenes and amphiboles was also examined by TEM means. (Author)

Descriptors :   *Plastic deformation, *Crystallography, *Minerals, Crystal structure, Slip flow, Dislocations, X ray diffraction, Electron microscopy

Subject Categories : Geology, Geochemistry and Mineralogy
      Crystallography
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE