Seismic stratigraphy and morphology of the Holocene progradational system beneath Bohai Bay, Bohai Sea: Lobate evolution of a multi-sourced subaqueous fluviodeltaic complex

doi:10.1016/j.margeo.2018.12.009

	Seismic stratigraphy and morphology of the Holocene progradational system beneath Bohai Bay, Bohai Sea: Lobate evolution of a multi-sourced subaqueous fluviodeltaic complex
	Liu, Shihao 1; Feng, Aiping 1,2; Liu, Chenguang 1,3; Zheng, Yanpeng 1,3; Li, Peiying 1,3; Zhang, Zhiwei 1,3
刊名	MARINE GEOLOGY
	2019-03
卷号	409 页码:31-47
关键词	Seismic stratigraphy Seismic morphology Progradation Subaqueous delta Holocene Yellow River Delta
ISSN号	0025-3227
DOI	10.1016/j.margeo.2018.12.009
英文摘要	Since 6 kyr BP, the subaerial deltas of the Yellow, the Yanshan and the Taihang river systems evolved along the Bohai Bay coast, forming several lobate progradational systems associated with frequent avulsions of these river systems. Their subaqueous parts consist of a multi-sourced subaqueous deltaic complex in Bohai Bay, but little is known about the complex's subsurface structure, morphology and evolutionary history. Here we investigate these characteristics using a dense, high-resolution seismic survey. Using stratigraphic superposition, seismic geometry, and the results of previous studies, we identified nine seismic units (SUs) in the post-Last Glacial Maximum stratigraphy, which are interpreted, from bottom to top, as: (1) fluvial/lacustrine sediments (SUO); (2) marine sands combined with estuarine/coastal deposits (SU1); and (3) a subaqueous fluviodeltaic complex (SUs2-8); these units correspond to the lowstand system tract, the transgressive and/or highstand system tracts, and the normal regressive system tract, respectively, and evolved as a function of eustatic fluctuations. The subaqueous fluviodeltaic complex is characterized by a discrete and spatially-confined lobate architecture, which is indicative of step-wise switching of subaqueous lobes. Two sets of progradational systems (PS), a northern one (SUs2-3) and a southern one (SUs4-8), were observed within the complex, tapering in opposite directions and bounded by an erosional unconformity (R3). These characteristics indicate that the two PS were sourced from different river systems and prograded at different times. R3 forms the base of the southern PS but cross cuts the northern PS, indicating that it is a diachronous surface marks the preexisting seafloor, which was further reworked/eroded by the progradation of the southern PS. In each PS, the internal subaqueous lobes correlated well with the onshore lobes/superlobes of the subaerial deltas, suggesting the lobate evolution of the complex is driven predominantly by alternating erosion and deposition caused by the variation in fluvial supply, which appears to be linked to the frequent avulsions of the major river systems, in addition to the multi-sourced supply. Based on the dipping geometries and the locations of the depocenters, we hypothesize that (1) the northern PS is the seaward extension of the ancient Haihe River's northern branch; (2) the bulk of southern PS in the middle and southern Bohai Bay is correlated with the principal body of the Yellow River subaqueous delta; (3) the majority of the volume of the northern PS in northern Bohai Bay consists of the modern Haihe River subaqueous delta.
资助项目	National Programme on Global Change and Air Sea Interaction[GASI-01-01-01-23]
WOS关键词	YELLOW-RIVER DELTA ; ESTUARINE TIDAL BAR ; CONTINENTAL-SHELF ; SUSPENDED SEDIMENT ; FIRE ISLAND ; MARINE TRANSGRESSION ; FLUVIAL CONTROLS ; GIRONDE ESTUARY ; LATE QUATERNARY ; INNER SHELF
WOS研究方向	Geology ; Oceanography
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000457661600003
内容类型	期刊论文
源URL	[http://ir.fio.com.cn:8080/handle/2SI8HI0U/26671]
专题	自然资源部第一海洋研究所
通讯作者	Liu, Shihao
作者单位	1.MNR, Inst Oceanog 1, Qingdao, Peoples R China 2.MNR, Isl Res Ctr, Pingtan, Peoples R China 3.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao, Peoples R China
推荐引用方式 GB/T 7714	Liu, Shihao,Feng, Aiping,Liu, Chenguang,et al. Seismic stratigraphy and morphology of the Holocene progradational system beneath Bohai Bay, Bohai Sea: Lobate evolution of a multi-sourced subaqueous fluviodeltaic complex[J]. MARINE GEOLOGY,2019,409:31-47.
APA	Liu, Shihao,Feng, Aiping,Liu, Chenguang,Zheng, Yanpeng,Li, Peiying,&Zhang, Zhiwei.(2019).Seismic stratigraphy and morphology of the Holocene progradational system beneath Bohai Bay, Bohai Sea: Lobate evolution of a multi-sourced subaqueous fluviodeltaic complex.MARINE GEOLOGY,409,31-47.
MLA	Liu, Shihao,et al."Seismic stratigraphy and morphology of the Holocene progradational system beneath Bohai Bay, Bohai Sea: Lobate evolution of a multi-sourced subaqueous fluviodeltaic complex".MARINE GEOLOGY 409(2019):31-47.