IOCAS-IR  > 海洋地质与环境重点实验室
Mixed Carbonate-Siliciclastic Deposits in a Channel Complex in the Northern South China Sea
Ma, Benjun1,2,3; Wu, Shiguo2,3,4; Mi, Lijun5; Luedmann, Thomas6; Gao, Jinwei2; Gao, Wei1,3
Corresponding AuthorWu, Shiguo(
AbstractNew high-resolution 3D seismic data image a submarine channel complex in the northern slope of the South China Sea. The channel complex stretches hundreds of kilometers across the slope and flows into the deepsea from the siliciclastic shelf margin, linking neritic environment to the pelagic plain. The evolution of the channel complex developed two sedimentary stages, stage I (19.1-18.5 Ma) and stage II (18.5-17.5 Ma), separated by erosional surfaces. In the first stage, the complex was filled with pure siliciclastic sediments, forming thick-massive sandstone intercalated by thin layers of mudstone. During the stage II, the channel complex was deposited five carbonate-siliciclastic cycles. The unexpected channel-fill carbonate deposits present allochthonous characteristics, suggesting the siliciclastic channel was surprisingly used to transport carbonate sediment from the adjacent neritic carbonate platform. By analyzing the periodical carbonate sedimentary process in the siliciclastic channel complex, we infer that it was related to the in situ carbonate production of the neritic carbonate platform and was most likely to be controlled by the relative sea-level changes. Unlike line-source carbonate slope aprons or small-sized carbonate channels, the large-sized siliciclastic channel complex links directly neritic carbonate platform to deepwater basin and can transport large volumes of neritic carbonates to the pelagic environment in a short period. The new findings help to estimate the contributions of neritic siliciclastic shelf and carbonate platform to deepwater slope more accurately. This study suggests that channel systems are more complex than expected and have significant implications on the conceptual models describing the deepwater sedimentary theory.
Keywordsubmarine channels mixed carbonate-siliciclastic deposits allochthonous carbonate sediment flux sedimentology South China Sea
Indexed BySCI
Funding ProjectNational Basic Research Program of MOST of China[2015CB251201] ; National Natural Science Foundation of China[91228208] ; National Natural Science Foundation of China[41506055] ; China Geological Survey[GZH201400210] ; China Geological Survey[DD20160140]
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000435629500021
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Document Type期刊论文
Corresponding AuthorWu, Shiguo
Affiliation1.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China
2.Chinese Acad Sci, Inst Deep Sea Sci & Engn, Key Lab Marine Georesources & Prospecting, Sanya 572000, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
4.Qingdao Natl Lab Marine Sci & Technol, Funct Lab Marine Geol & Environm, Qingdao 266061, Peoples R China
5.China Natl Offshore Oil Corp, Shenzhen Branch, Guangzhou 510420, Guangdong, Peoples R China
6.Univ Hamburg, Inst Geol, Ctr Earth Syst Res & Sustainabil, D-20146 Hamburg, Germany
First Author AffilicationInstitute of Oceanology, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Ma, Benjun,Wu, Shiguo,Mi, Lijun,et al. Mixed Carbonate-Siliciclastic Deposits in a Channel Complex in the Northern South China Sea[J]. JOURNAL OF EARTH SCIENCE,2018,29(3):707-720.
APA Ma, Benjun,Wu, Shiguo,Mi, Lijun,Luedmann, Thomas,Gao, Jinwei,&Gao, Wei.(2018).Mixed Carbonate-Siliciclastic Deposits in a Channel Complex in the Northern South China Sea.JOURNAL OF EARTH SCIENCE,29(3),707-720.
MLA Ma, Benjun,et al."Mixed Carbonate-Siliciclastic Deposits in a Channel Complex in the Northern South China Sea".JOURNAL OF EARTH SCIENCE 29.3(2018):707-720.
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