Sea level changes are one of important controlling factors for cyclic sedimentation. In cratonic coastal plane settings, depositional environments in the vicinity of the shoreline are very easy to be influenced by sea level changes, resulting in obvious cyclic sedimentation, while depositional environments far away from the shoreline, either landward or seaward, don't vary much with sea level changes. As a result, cyclicity in the shoreline area shows higher frequency than those in the area far away from the shoreline. Generally, the shoreline area is the favorable site for coal accumulation, so the area with the maximum number of depositional cycles is the coal accumulation center. Therefore, in a cycle frequency curve, the maximum frequency is corresponding to the coal accumulation center. However, location of this maximum frequency varies from lowstand, transgressive to highstand sequence sets in a third-order sea level change. This variation allows us to identify migrating regularity of the coal accumulation center. According to high-resolution sequence stratigraphic analyses, the late Permian of western Guizhou is subdivided into 3 third-order composite sequences and 15 fourth-order sequences, and each third-composite sequence is composed of lowstand, transgressive and highstand systems tracts. In this paper, cycle frequency curves corresponding to different sequence sets and different composite sequences are reconstructed and migrating regularity of the coal accumulation center are analyzed.
. THE APPLICATION OF DEPOSITIONAL CYCLE FREQUENCY CURVE TO EPISODIC COAL ACCUMULATION: WITH AN EXAMPLE FROM THE UPPER PERMIAN IN SOUTHWESTERN CHINA[J]. JOPC, 2000, 2(4): 12-19.
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