Discussion on the Response of Sequence Stacking Patterns to AsymmetricalTectonic Subsidence Depending on the Sequence Quantitative Simulation

Key words: 
• sequence stratigraphic quantitative simulation /
• asymmetrical tectonic subsidence nonsynchronous stacking pattern of isochronous sequence /
• SEDPAK /

Abstract: On the Basis of stratigraphic modelling using the SEDPAK computer program, the response of sequence stacking patterns to asymmetrical tectonic subsidence within a rift basin was simulated by considering the various parameters controlling the deposition of a sequence. The simulation results indicate that isochronous sequence stratigraphy within a rift basin may exhibit both synchronous and nonsynchronous stacking patterns at different part of the basin. Synchronous stacking patterns refer to that at any part of the basin the same transgression, retrogression and aggression occurs concurrently. Nonsynchronous stacking patterns refer to that within the same basin some part may exhibit the exact opposite stacking patterns as other parts concomitantly. 
〓〓The development of nonsynchronous stacking patterns were found to be caused by the combination of both accommodation space increment（ΔA）more than sediment supply increment（ΔS）（ΔA＜ΔS）in one side of basin and accommodation space increment（ΔA）less than or equal to sediment supply increment （ΔS）（ΔA≥ΔS）in other sides of basin. Meanwhile, duration of nonsynchronous stacking patterns was controlled by the interplay of accommodation space increment（ΔA）and sediment supply increment（ΔS）.Recognition of nonsynchronous stacking patterns of isochronous sequence stratigraphy provides a new insight into continental sequence stratigraphy, and might be widely applicable for the Cenozoic basins in the eastern China. 