Выпуск: 6-7 , Том: 25 , Год издания: 2000

We present new paleomagnetic data on Carboniferous volcano-sedimentary rocks from a section located in the northern part of Zaysan Depression (Narym Zone, Eastern Kazakhstan) which are transformed by shear deformation to different degrees. These data suggest that rocks which have experienced sheer acquire magnetization whose orientation coincides with the deformation surface (e.g. cleavage etc.). Moreover, it is shown that in steeply inclined strata deformational processes resulted in the shallowing of inclination of the paleomagnetic vectors in stratigraphic coordinates so that finally the characteristic directions may be completely reoriented parallel to the bedding surface. No noticeable mechanical reorientation of mineral grains was observed in deformed rocks both with old paleomagnetic directions deflected away from the original position and with new paleomagnetic directions acquired due to deformation as well (brittle deformation). (C) 2000 Elsevier Science Ltd. All rights reserved.