Characteristics of Sedimentary Facies and Sequence Boundary in Upper Cretaceous QingshankouYaojia Formation of Northern Songliao Basin
- Received Date: 1900-01-01
- Rev Recd Date: 1900-01-01
- Publish Date: 2007-02-10
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Key words:
- sedimentary facies /
- sequence boundary /
- QingshankouYaojia Formation /
- Northern Songliao Basin
Abstract: Qingshankou and Yaojia Formation developed delta and lacustrine facies along the long axis of the basin during the period of depression. Qingshankou Formation consists of littoral lake, shallow lake and semideep lake facies. Yaojia Formation consists of delta plain, delta front and prodelta facies. Base on analyses of drilling cores, from the top of Quantou Formation to the top of Yaojia Formation can be divided into 6 sequences, and corresponding to 7 sequence boundaries. One of the sequence boundaries is supersequence boundary. Sequence boundary is characterized by paleosol, erosional surface, calcareous nodules, and truncation. Generally, oolitic limestone, bioclastic limestone, worm boring and pyrite develop above the sequence boundary.
Citation: | ZHUO Hongchun. Characteristics of Sedimentary Facies and Sequence Boundary in Upper Cretaceous QingshankouYaojia Formation of Northern Songliao Basin[J]. Acta Sedimentologica Sinica, 2007, 25(1): 29-38. |