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Seismic characteristics and sedimentary record of the late Pleistocene delta offshore southwestern Hainan Island, northwestern South China Sea
Feng, Yingci1; Zhan, Wenhuan1; Chen, Hongjun2,3; Jiang, Tao4; Zhang, Jinchang; Osadczuk, Andrzej5; Yao, Yantao; Li, Wei; Sun, Jie; Guo, Lei1; Huang, Wenkai2,3; Li, Shun2,3; Zhang, Wenyan6
2018
Source PublicationINTERPRETATION-A JOURNAL OF SUBSURFACE CHARACTERIZATION
ISSN2324-8858
Volume6Issue:4Pages:SO31
AbstractA late Pleistocene delta (Hainan palaeo river delta, HNPD hereafter) exceeding 25,000 km(2) offshore Hainan Island, northwestern South China Sea (SCS), is investigated using high-resolution seismic and core data to understand the relationship between subaqueous delta development and climate drivers during the Last Glacial Period. The seismic data indicate general progradational configurations toward the southwest or southeast, indicating that the sediments from the eastern slope offshore southwestern Hainan Island were transported southwestward and southeastward. The average thickness of the delta sediment is approximately 35 m, and it has an arcuate shape surrounding the eastern slope. Therefore, the sediment provenances of the HNPD were mainly from the Red River drainage and Hainan Island. Comparison between the core dating results and the global sea-level curve indicates that the delta formed mainly during marine isotope stage 4 (65-56 ka). The topography of the basin, the sea-level change from low stand to high stand, and the southward oceanic currents driven by the glacial-period strong winter monsoon all contributed to the formation of the delta. Because the development of the delta required large riverine sediment input, we speculate that the main reason that the delta's development ceased was the migration of the river channel along the eastern slope. Based on a comparison between the palaeobathymetric scenarios derived from published sea-level curves and the delta stratigraphy identified from the seismic profiles and cores, we have determined a possible range of relative sea level between 65 and 56 ka for the southwestern coast of Hainan Island, which might also be applicable for a broader region, i.e., the northern SCS.
DepartmentOMG
DOI10.1190/INT-2018-0012.1
Citation statistics
Document Type期刊论文
Identifierhttp://ir.scsio.ac.cn/handle/344004/17989
Collection中科院边缘海地质重点实验室
Affiliation1.South China Sea Inst Oceanol, CAS Key Lab Ocean & Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Guangzhou Marine Geol Survey, China Geol Survey, Guangzhou 510075, Guangdong, Peoples R China
4.Minist Land & Resources, Key Lab Marine Mineral Resources, Guangzhou 510075, Guangdong, Peoples R China
5.China Univ Geosci, Fac Resources, Key Lab Tecton & Petr Resources, Minist Educ, Wuhan 430074, Hubei, Peoples R China
6.Univ Szczecin, Inst Marine & Coastal Sci, PL-70383 Szczecin, Poland
7.Helmholtz Zentrum Geesthacht, Inst Coastal Res, D-21502 Geesthacht, Germany
Recommended Citation
GB/T 7714
Feng, Yingci,Zhan, Wenhuan,Chen, Hongjun,et al. Seismic characteristics and sedimentary record of the late Pleistocene delta offshore southwestern Hainan Island, northwestern South China Sea[J]. INTERPRETATION-A JOURNAL OF SUBSURFACE CHARACTERIZATION,2018,6(4):SO31, SO43.
APA Feng, Yingci.,Zhan, Wenhuan.,Chen, Hongjun.,Jiang, Tao.,Zhang, Jinchang.,...&Zhang, Wenyan.(2018).Seismic characteristics and sedimentary record of the late Pleistocene delta offshore southwestern Hainan Island, northwestern South China Sea.INTERPRETATION-A JOURNAL OF SUBSURFACE CHARACTERIZATION,6(4),SO31.
MLA Feng, Yingci,et al."Seismic characteristics and sedimentary record of the late Pleistocene delta offshore southwestern Hainan Island, northwestern South China Sea".INTERPRETATION-A JOURNAL OF SUBSURFACE CHARACTERIZATION 6.4(2018):SO31.
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