GEOLOGICAL INTERPRETATION AND THE CHARAC-TERISTICS OF TECTONIC EVOLUTION ON REGIONAL SEISMIC PROFILE IN NORTH CHINA BASIN

North China Basin attributed to a type of cratonic basin from Sinian to Triassic time is superimposed by Meso-Cenozoic converted faultdown basins. The characteristics of seismic waves can be grouped into three regional datum waves, six reflective waves of local or erosion surfaces with four tectonic systems and six tectonic sub-systems. The basin might be divided into three types: the large scale of depression basin during Q-N; the graben and/or half-graben basin during E-J and the cratonic basin in T-Z period. In accordance to integrated geological inter-pretations and the data from seismic profile and gravity/electrical surveys, the tectonic evolution of the basin can be divided into three stages: the 1st stage, the platform developed steadily from Sinian to Triassic; the 2nd stage, two diktyogeneses took place under the joint actions of Tethys and Kula Plate from Late Indosinian to Early (or Middle) Yanshanian and Late Yanshanian to Early Xishanian with twice stress conversions and two different times of extension and depression basins; the 3rd stage, the collision between Indian Plate and Eurasian Plate, bringing about the third diktyogenesis and thd basin transformed from faultdown to depression.