Role of Lacustrine Carbonate Rock in Establishment of Sequence Stratigraphy Framework of Lower Tertiary in Sube i Basin

Key words: 
• sequence stratigraphy /
• the special role of lacustrine carbonat rocks /
• Subei basin

Abstract: As one of important rock types in marine sequence stratigraphy analysis, carbonate rock and its sequence stratigraphic model have been established. Althrough carbonate rocks inMeso-cenozoic lacustrine sediments in China is not very abundant as that in marine environment, they are still an important constitutes in lacustrine depositional profile. However, papers published in recent years related to lacustrine sequence stratigraphy are very small dealtwith lacustrine carbonate rocks due to the weak research on them. In this paper, based on the establishment of sequence stratigraphic framework of Subei basin, we have also studied the role of lacustrine carbonate rocks in our research. It is proposed that the distribution of carbonate nodules and lump s is a mark for recongnizing sequence boundary and systems tracts; and the depositional shifting of grain carbonate rocks can also serve as an importantmark for different systems tracts. and the p rofile change of carbonate rocks is also indicator for identifying parasequence and parasequence sets. In addition, the stably distributed dark fine carbonate rock and muddy shale interbedding is a mark of condensed section. This paper aims at appealing attention to the special role of carbonate rocks in establishing sequence stratigraphy in lacustrine sediments among the researchers.