Provenance analysis of the Upper Miocene turbidite sand-bodies in deep-sea basin of northern South China Sea
Zhou Jun-Shen1, Shao Lei1, Qiao Pei-Jun1, Cui Yu-Chi1, Sun Zhen2, Hou Yuan-Li1, Yang Yi-Kai1
1 State Key Laboratory of Marine Geology,Tongji University,Shanghai 200092,China; 2 CAS Key Laboratory of Ocean and Marginal Sea Geology,South China Sea Institute of Oceanology, Chinese Academy of Sciences,Guangzhou,510301 China
Abstract：The International Ocean Discovery Program (IODP) Expedition 367/368 reported massive Upper Miocene deep-sea turbidite in the northern South China Sea basin. The Upper Miocene turbidite sand-bodies at Site U1500 were examined with detrital zircon U-Pb dating to conduct the source-to-sink analysis. This study shows that the U-Pb age spectrums of Site U1500 sample are similar to those detrital zircons from the Miocene Qiongdongnan Basin and the Pearl River Mouth Basin. Multidimensional scaling (MDS) plot also shows that the turbidite sand-bodies at Site U1500 are closely related to the sediments in the Pearl River Mouth Basin and Qiongdongnan Basin. It is likely that the thick deep-sea turbidite succession in the deep-water basin of northern South China Sea was formed by a mixed provenance pattern during the late Miocene. On the one hand, terrigenous sediments from the west of the South China Sea were transported along the Central Canyon to the eastern South China Sea deep-sea basin in the form of turbidity current. On the other hand, terrigenous sediments were also transported from the Pearl River through the slope canyon system to the northern South China Sea in the form of gravity flow . Those mixed sediments from two different source areas have collectively deposited at the deep-sea basin and thus, give rise to turbidite sequence of hundred meters. Provenance analysis of the thick turbidites sand-bodies in the deep-sea basin is of great significance to the profound understanding of the tectonic evolution, filling processes, provenance evolution, and the palaeogeographic characteristics of the Cenozoic basins of the South China Sea.
Zhou Jun-Shen,Shao Lei,Qiao Pei-Jun et al. Provenance analysis of the Upper Miocene turbidite sand-bodies in deep-sea basin of northern South China Sea[J]. JOPC, 2020, 22(4): 775-784.
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