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Slip systems and critical resolved shear stress in pyrite: an electron backscatter diffraction (EBSD) investigation

Published online by Cambridge University Press:  05 July 2018

C. D. Barrie ,
A. P. Boyle ,
S. F. Cox  and
D. J. Prior
C. D. Barrie*
Affiliation:
Department of Earth and Ocean Sciences, University of Liverpool, Liverpool L69 3GP, UK School of Geography and Geosciences, Irvine Building, University of St Andrews, Fife KY16 9AL, UK
A. P. Boyle
Affiliation:
Department of Earth and Ocean Sciences, University of Liverpool, Liverpool L69 3GP, UK
S. F. Cox
Affiliation:
Research School of EarthSciences, Australian National University, ACT 0200, Australia
D. J. Prior
Affiliation:
Department of Earth and Ocean Sciences, University of Liverpool, Liverpool L69 3GP, UK
*
*E-mail: [email protected]
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Abstract

A suite of experimentally deformed single-crystal pyrite samples has been investigated using electron backscatter diffraction (EBSD). Single crystals were loaded parallel to <100> or <110> and deformed at a strain rate of 10-5 s-1, confining pressure of 300 MPa and temperatures of 600°C and 700°C. Although geometrically (Schmid factor) the {001}<100> slip system should not be activated in <100> loaded samples, lattice rotation and boundary trace analyses of the distorted crystals indicate this slip system is easier to justify. Determination of 75 MPa as the critical resolved shear stress (CRSS) for {001}<100> activation, in the <110> loaded crystals, suggests a crystal misalignment of ~5—15° in the <100> loaded crystals would be sufficient to activate the {001}<100> slip system. Therefore, {001}<100> is considered the dominant slip system in all of the single-crystal pyrite samples studied. Slip-system analysis of the experimentally deformed polycrystalline pyrite aggregates is consistent with the single-crystal findings, with the exception that {001}<11̄> also appears to be important, although less common than the {001}<100> slip system. The lack of crystal preferred orientation (CPO) development in the polycrystalline pyrite aggregates can be accounted for by the presence of two independent symmetrically equivalent slip systems more than satisfying the von Mises criterion.

Keywords

pyritedislocationsslip systemsEBSDdeformationcritical resolved shear stress
Type
Research Article
Information
Mineralogical Magazine , Volume 72 , Issue 6 , December 2008 , pp. 1181 - 1199
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2008

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