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Provenance Evolution of Paleogene Sequence(Northern South China Sea)Based on Detrital Zircon U-Pb Dating Analysis

Cui Yuchi;Cao Licheng;Qiao Peijun;Chen Shuhui;Pang Xiong;Shao Lei;State Key Laboratory of Marine Geology,Tongji University;Shenzhen Branch of China National Offshore Oil Corporation;  
The early rift provenance evolution of the South China Sea(SCS)remains unsystematically explored due to limitations of borehole coverage and shortages of reliable dating results.In this study,detrital zircon U-Pb dating methodology was used to investigate the"source to sink"patterns of Paleogene syn-rift sequences in the northern SCS.In addition to the terrigenous supply transported from the north,it is found that intrabasinal provenances are also of great significance.The Eocene samples are dominated by Early Cretaceous zircon.The Early Oligocene sediments of Qiongdongnan basin indicate a source from Hainan Island and Xisha uplift while contemporary sediments of Zhu-1 depression in northern Pearl River Mouth basin were supplied by southeastern South China with highly-grained zircons sharing similar U-Pb age characteristics.Nevertheless,based on the existence of euhedral zircon shapes,Baiyun sag in southern Pearl River Mouth basin was most likely dominated by intrabasinal sources.The late Oligocene sequence of Liwan sag and Qiongdongnan basin could have been supplied by western uplift of the SCS with the increasing abundance of Proterozoic zircon ages.It has been revealed that the Pearl River could only have contributed to the infill of Zhu-1 depression during Early Oligocene before evolving into the terrigeous source for northern Zhu-2 depression in Late Oligocene.Conclusively,the Paleogene provenance development of the northern SCS is remarkablyfeatured as episodic and diachronic Pearl River evolution processes.
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