Abstract:

There are plenty of traditional methods to calculate denuded amount of Prototype Basin,but the results of these methods can hardly reflect the real reason of lacuna.The wave analysis method is based on the principle from knowing to unknowing to establish the wave equation by sedimentary rate histogram of residual stratum in geological time profile,and then find out the periodic wave of stratum deposited in different stages,judge the reason and the amount of sedimentary lacuna.To use this new method,one have to select the study areas as evenly as possible first,then change the lithologic-thickness sections into lithologic-time sections according to original data analysis,and finally plot sedimentary rate curves,restore stratigraphic denudation amount.The method was used to analyse the Huayong Formation in Sanshui Basin.The results suggest that there had been sediments of Late Oligocene and Neogene,but all were denuded.The present boundary of the Sanshui Basin was acturally formed after 39 Ma

Key words: prototype basin, denuded amount, wave analysis