Preferred Orientation of Experimentally Deformed Mt Isa Chalcopyrite Ore

E. M. Jansen, H. Siemes, P. Merz, W. Schäfer, G. Will and M. Dahms
Institut für Mineralogie und Lagerstättenlehre, RWTH Aachen, 5100 Aachen, Germany
Mineralogisches Institut, Universität Bonn, Außenstelle Forschungszentrum Jülich (KFA), 5170 Jülich, Germany
Forschungszentrum Geesthacht (GKSS), Max-Planck-Straße, 2054 Geesthacht, Germany

Abstract: Chalcopyrite samples from Mt Isa, Australia have been experimentally shortened by up to 30% at temperatures up to 450 °C, at a constant confining pressure of 300 (400) MPa, and different strain rates in the range from 10−5 to 10−8 sec−1. After deformation, the X-ray pole figures show a maximum of (220/204) perpendicular to the compression axis for each of the samples, which has already been described for room temperature experiments by Lang (1968). The overlapping pseudocubic peaks of chalcopyrite can be separated into true tetragonal peaks by neutron diffraction texture analysis using a position sensitive detector combined with profile analysis (Will et al., 1989). The five investigated samples each show a combination of two or four main orientations of the crystallites, which represent neither a pseudocubic nor a tetragonal fibre texture.

Keywords: chalcopyrite • experimental deformation • preferred orientation • X-ray texture analysis • neutron diffraction texture analysis

Mineralogical Magazine; March 1993 v. 57; no. 386; p. 45-53; DOI: 10.1180/minmag.1993.057.386.05
© 1993, The Mineralogical Society
Mineralogical Society (