| Popis: |
The stratigraphicsequences that occur throughout the sedimentary record are the products of independent variations in eustasy, tectonic movement and rates of sedimentation. The computer program Sedpak, which graphically simulates the sequence stratigraphicfill of basins by changing sea-level position, tectonic movement and sedimentation rate as independent variables, was used to test interpretations of the evolution of Neogene sequences in the offshore Canterbury Basin, eastern South Island, New Zealand. The simulation results for the Canterbury Basin suggest that sequence boundaries were created by changes in depositional base level (i.e. sea level), which in turn were driven by variations in the rate of eustatic and/or tectonic change. Varying the rate of sediment supply in the simulations did not produce sequence-bounding unconformities, but greatly influenced sequence stacking patterns. |
