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The Role of Bottom Currents on the Morphological Development Around a Drowned Carbonate Platform,NW South China Sea

Journal of Ocean University of China 2022年第4期21卷 801-812页

作者： YU Kaiqi ALVES Tiago M LI Wei LI Shuang LI Jian ZHAO Fang WU Shiguo ZHAN Wenhuan CAS Key Laboratory of Ocean and Marginal Sea Geology South China Sea Institute of OceanologyChinese Academyof SciencesGuangzhou 510301China Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou) Guangzhou 511458China University of Chinese Academy of Sciences Beijing 100049China 3D Seismic Laboratory School of Earth and Ocean SciencesCardiff UniversityCardiff CF103ATUK Institute of Deep-Sea Science and Engineering Chinese Academy of SciencesSanya 572000China

The seafloor around carbonate platforms is largely shaped and modified by downslope ***,the role of alongslope processes,including bottom currents,on the morphological development of carbonate platforms remains poorly ***,we use high-resolution multibeam bathymetric data and two-dimensional seismic profiles to investigate the detailed sea-floor morphology around the Zhongjianbei carbonate platform(ZCP)in the northwest South China Sea.A series of depositional bodies and erosional channels are identified to the south of the ZCP and are interpreted as contourite drifts and channels resulted from the interaction between bottom currents and bathymetric *** addition,active fluid seepages have led to the formation of widespread pockmarks on the ***,the contourite channels and widespread pockmarks also show a close relationship in their *** propose that the contourite channels around the ZCP are evolved from the coalescence of pockmarks under the persistent erosion of bottom *** on the morphological analysis,we reconstruct the past bottom-current pathways around the ZCP that are parallel to the platform slopes and heading to the *** study provides new insights into the formation of complex bathymetry and helps understanding how bottom currents and active fluid seepages can influence the morphological development around carbonate platforms.

关键词： carbonate platform seafloor morphology contourite channels bottom currents fluid seepages South China Sea

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