FABRIC CHARACTERISTICS OF SUBAERIAL SLOPE DEPOSITS

The clast fabrics of certain types of terrestrial slope deposits are r eviewed and compared, including the deposits of rockfalls, solifluctio n, debris flows, dry grain flows, frost-coated clast flows and run-off . The analysis is based on modern deposits in active environments. The study shows that fabric characteristics allow discrimination between 'collective' and individual movement of rock particles. The individual particle movement generally results in a random clast orientation, wh ereas the processes of 'collective' movement typically create distinct preferred orientations. The highest fabric strengths together with lo w values of spherical variance are found in solifluction deposits. A s urvey of Pleistocene slope deposits indicates, however, that clast fab ric has to be used with caution in the identification of past slope dy namics, because significant post-depositional changes may occur during ageing and burial of deposits. The diagnostic significance of fabric characteristics may also be low due to the overlap of the statistical values that typify different processes.