Role of Lacustrine Carbonate Rock in Establishment of Sequence Stratigraphy Framework of Lower Tertiary in Sube i Basin
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摘要: 在建立苏北盆地层序地层格架的同时,研究了碳酸盐岩在其中的作用,提出了碳酸盐岩结核和团块的分布是识别层序地层界面和体系域标志;粒屑碳酸盐岩的沉积迁移也可作为识别不同体系域的重要标志;碳酸盐岩的序列变化是识别准层序,准层序组的标志;稳定分布的暗色细粒碳酸盐岩与泥岩的互层是识别凝缩层和最大湖泛面的标志,认为今后在层序地层分析中应充分发挥湖相碳酸盐岩特有的作用。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.
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