Discussion about Base-level Changes in the Analysis of High-resolution Sequence Stratigraphy

Key words: 
• accommodation space /
• base-level /
• sea level

Abstract: There are three different concep tions about base-level that are base level of erosion, base level of deposition and stratigraphic datum, respectively. At present, the arguments still exist in the explanation and the app lication of base-level, especially bas-level seems amphibious in use. The exp lanation of the stratification base-level in the high-resolution sequence stratigraphy is analyzed in this paper, and, in particular, the portion focused on illustration about marine facies sedimentary environment is questioned. The author discussed the relation between accommodation space and stratigraphic datum. Accommodation space is the key conception in sequence stratigraphy and base-level is also important, so they are very significant to illustrate the mechanism of the formation of sequence. Base level of erosion, base level of deposition and stratigraphic datum are all potential energy levels, kinetic surfaces and are all variable, just differing from the criterion of analyses and the mechanism of formation. To illustrate the features of these three base-levels profoundly, more questions of quantitative research into base-level should be considered.