Identification Marks of Paleo-flood Events and the Preliminary Application of Micro-morphology in It

Paleo-flood hydrology study is a hot field in global change study.It is the key for studying paleo-flood events how to look for and identify the paleo-flood slack-water deposits effectively and accurately.In this paper,the effects of paleontology,archeology,sedimentology and geochemistry in studying paleo-flood events are summarized at first,and then the micro-morphological features of paleo-flood deposits and other strata are compared and analyzed based on the theory of micro-morphology.The results show that the grain characteristics,mineral composition,pores and micro-configuration in paleo-flood deposits are obviously different from those in other strata:(1) The grains in the paleo-flood slack-water deposits are fine,well-sorted and subrounded or rounded;(2) Mineral composition in the paleo-flood deposits is similar to that in other strata,but the contents of unstable minerals are relatively low in paleo-flood deposits;(3) Soil in paleo-flood deposits is dominated by clay,and the clay content is second only to that in paleosol;(4) The pores are irregular,and the pore walls are coarse.These reveal that the micro-morphology can be used to research and identify the paleo-flood events.