GEOLOGICAL INTERPRETATION ON THE RESULTS OF CLUSTER ANALYSIS OF TRACE ELEMENTS FROM ARGILLACEOUS ROCKS IN THE JURASSIC,CRETACEOUS AND TERTIARY STRATA IN XIZANG

The present paper deals with the geological interpretation on the results of cluster analysis of the trace elements from the argillaceous rocks in the Jurassic, Cretaceous and Tertiary strata in the Xizang region.
Due to distinctive sedimentary geochemical properties of different trace element associations and to the influence of a variety of palaeoclimatic, palaeotectonic and palaeohydrogeologic conditions on the formation of the trace elements, the dispersion and concentration of the trace elements in various sedimentary environments tend to display some regular changes, which may not only be employed as the criteria for recognition of sedimentary environments, but also provide the associated data on the fossil water media.