文献类型：期刊文献

英文题名：Depositional architecture and evolution of basin-floor fan systems since the Late Miocene in the Northwest Sub-Basin, South China Sea

作者：Chen, Hui Stow, Dorrik A., V Xie, Xinong Ren, Jianye Mao, Kainan Gao, Ya Chen, Beichen Zhang, Wenyan Vandorpe, Thomas Van Rooij, David

第一作者：Chen, Hui

通信作者：Xie, XN[1];Stow, DAV[2]

机构：[1]Sun Yat Sen Univ, Sch Marine Sci, Zhuhai 519082, Guangdong, Peoples R China;[2]China Univ Geosci CUG, Hubei Key Lab Marine Geol Resources, Wuhan 430074, Hubei, Peoples R China;[3]Southern Marine Sci & Engn Guangdong Lab Zhuhai, Zhuhai 519000, Guangdong, Peoples R China;[4]Heriot Watt Univ, Inst Geoenergy Engn, Edinburgh EH14 4AS, Midlothian, Scotland;[5]Guizhou Inst Technol, Coll Resource & Environm Engn, Guiyang 550003, Guizhou, Peoples R China;[6]Helmholtz Zentrum Geesthacht, Inst Coastal Res, D-21502 Geesthacht, Germany;[7]Flanders Marine Inst, Wandelaarkaai 7, B-8400 Oostende, Belgium;[8]Univ Ghent, Renard Ctr Marine Geol, Dept Geol, Krijgslaan 281 S8, B-9000 Ghent, Belgium

第一机构：Sun Yat Sen Univ, Sch Marine Sci, Zhuhai 519082, Guangdong, Peoples R China

通信机构：corresponding author), China Univ Geosci CUG, Hubei Key Lab Marine Geol Resources, Wuhan 430074, Hubei, Peoples R China;corresponding author), Heriot Watt Univ, Inst Geoenergy Engn, Edinburgh EH14 4AS, Midlothian, Scotland.

年份：2021

卷号：126

外文期刊名：MARINE AND PETROLEUM GEOLOGY

收录：;EI(收录号：20210309787966);Scopus(收录号：2-s2.0-85099369379);WOS:【SCI-EXPANDED(收录号:WOS:000620632400001)】；

基金：The study was supported by the National Natural Science Foundation of China (Nos. 41976067, 41830537, 91528301), the China-ASEAN Maritime Cooperation Fund Project (12120100500017001), the Programme of Introducing Talents of Discipline to Universities (No. B14031), and the Fundamental Research Funds for the Central Universities, China University of Geosciences (Wuhan) (Nos. CUG170659). We would like to acknowledge the China National Offshore Oil Corporation for providing geophysical data. We thank Ben Kneller, Tilmann Schwenk and Khurram Shahzad for their pre-review and review comments as well as constructive suggestions, comments, which significantly improved the manuscript.

语种：英文

外文关键词：Basin-floor submarine fans; Architectural elements; Seismic facies; Northwest Sub-Basin; South China Sea

摘要：The sediment budget of the Northwest Sub-basin, South China Sea since the Late Miocene (11.6 Ma, average thickness > 1000 m) accounts for more than two-thirds of the total infill since the initial ocean spreading of the sub-basin (32 Ma). The sediment sources and architectural pattern of these deposits, however, are poorly known. Using high-resolution 2D reflection seismic data with age constraint from IODP boreholes, we have documented two interdigitating basin-floor fan systems that developed since the Late Miocene. These were fed by two of the largest deep-water canyon systems worldwide, from the west (the Central Canyon/Xisha Trough) and the northeast (the Pearl River Canyon), as well as from smaller headless canyons and gullies across the surrounding slopes. Based on careful analysis of seismic facies, their geometry and occurrence, we identify the principal deepwater architectural elements, including the multi-scale channels, channel-levee complexes, lobes, sheets and drapes, mass-transport deposits, volcanic intrusions, turbidity-current sediment-wave fields, and a contourite drift/terrace. Tentative reconstructions show that the development of these Late Miocene-Quaternary basin-floor fan systems was dominated by changes of sediment supply. The Xisha fan reached its largest extent during the Late Miocene, while the Pearl River fan was most active during the Late Miocene to Quaternary. During the Late Miocene, both the conduits of the Central Canyon and the Pearl River Canyon were active with abundant sediment supply, generating the two incipient fan systems. Sediment supply from the west via the Central Canyon persisted throughout the Late Miocene, being coarser-grained than that of the Pearl River fan. With the demise of the Central Canyon during the Pliocene and consequent sharp decrease in sediment supply, the Xisha fan size reduced significantly. By contrast, supply of mud-rich sediments from the Pearl River and northern slope increased through the Pliocene and into the Quaternary, leading to the modern sedimentary pattern of interdigitating basin-floor fans. Insights into the evolution of sediment supply and fan development through time derived in this study contribute to a better understanding of how source to sink systems feed marginal oceanic basins such as the South China Sea.