THE GENESIS AND SIGNIFICANCE OF ROOT TEXTITE IN COAL BEARING STRATA

Based on the study and testing analysis on the texture characteristics of rock mass,the genesis of a kind of cone rock-root textite-developed in the coal-bearing strata is discussed.It is the soil mass maintained by the umbrella shaped root system of trees during the geological history,and it is formed by the interactive compression of tree load and growth of main root system and by the differential compaction of surrounding soil mass;in other words,it also is a kind of the sedimentary textite or sedimentary structure formed under the influences of biological process.Comparing with other sedimentary structure,the root textite has the better sequence indication signficance.In the coal-bearing strata the development of root textite indicates the complex sedimentary environment and geomorphology in the mire during coal-accumulating period,as well as the phenomena of short term variation of microgeomorphology.