Abstract
Based on more than 4000 km 2D seismic data and seismic stratigraphic analysis, we discussed the extent and formation mechanism of the Qiongdongnan deep sea channel. The Qiongdongnan deep sea channel is a large incised channel which extends from the east boundary of the Yinggehai Basin, through the whole Qiongdongnan and the Xisha trough, and terminates in the western part of the northwest subbasin of South China Sea. It is more than 570 km long and 4–8 km wide. The chaotic (or continuous) middle (or high) amplitude, middle (or high) continuity seismic facies of the channel reflect the different lithological distribution of the channel. The channel formed as a complex result of global sea level drop during early Pliocene, large scale of sediment supply to the Yinggehai Basin, inversion event of the Red River strike-slip fault, and tilted direction of the Qiongdongnan Basin. The large scale of sediment supply from Red River caused the shelf break of the Yinggehai Basin to move torwards the S and SE direction and developed large scale of prograding wedge from the Miocene, and the inversion of the Red River strike-slip fault induced the sediment slump which formed the Qiongdongnan deep sea channel.
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Supported by the National High Technology Research and Development Program of China (863 Program, 2006AA09Z349), the National Basic Research Program of China (2007CB411703)
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Yuan, S., Lü, F., Wu, S. et al. Seismic stratigraphy of the Qiongdongnan deep sea channel system, northwest South China Sea. Chin. J. Ocean. Limnol. 27, 250–259 (2009). https://doi.org/10.1007/s00343-009-9177-0
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DOI: https://doi.org/10.1007/s00343-009-9177-0