Influence of Initial Texture, Temperature and Total Strain on the Texture Development of Polycrystalline Pyrrhotite Ores in Deformation Experiments

The development of the crystallographic preferred orientation (texture) of polycrystalline pyrrhotite fromSullivan mine, Canada, and Cerro de Pasco, Peru was determined by neutron texture analyses beforeand after experimental deformation. The pyrrhotite ore from Sullivan has an initial texture with a distinctc-axis maximum perpendicular to the foliation whereas the ore from Cerro de Pasco shows a weakand moreover inhomogeneous texture within the specimen. The deformation texture and deformation behaviour of samples from Sullivan were investigated asa function of temperature, total strain and the angle between the compression axis and the initial c-axismaximum. The deformation textures show the influence of different activated glide modes as afunction of the compression direction and temperature. Investigations of the deformation texture anddeformation behaviour of samples from Cerro de Pasco were carried out as a function of temperature,total strain and strain rate. The inhomogeneous texture of the starting material did not allow to drawconclusions about the texture development as a function of strain rate and temperature. Neverthelessthe preferred orientation of the c-axes parallel to the compression axis becomes more evident withincreasing total strain.