Sedimentary evolution of the Holocene subaqueous clinoform off the Shandong Peninsula in the Yellow Sea

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	Sedimentary evolution of the Holocene subaqueous clinoform off the Shandong Peninsula in the Yellow Sea
	Liu, J (Liu, Jian); Saito, Y (Saito, Yoshiki); Wang, H (Wang, Hong); Yang, ZG (Yang, Zigeng); Nakashima, R (Nakashima, Rei)
刊名	MARINE GEOLOGY
	2007
卷号	236 期号:3-4 页码:165-187
关键词	sedimentation meltwater pulses subaqueous clinoform sea-level change Holocene Yellow Sea
ISSN号	0025-3227
英文摘要	A subaqueous clinoform wraps around the end of the Shandong Peninsula in the Yellow Sea. The clinoform, previously called the Shandong mud wedge, is up to 40 m thick nearshore and thins seaward. Its origin has been controversial since it was first noted in the 1980s. For our recent investigation offshore of the northeastern Shandong Peninsula, high-resolution shallow seismic profiles covering about 1700 km were obtained, and two drilling cores penetrating the clinoform were recovered. We described the lithofacies characteristics, identified benthic foraminifera and ostracoda, measured grain size, analyzed the mineral components of the cores, and obtained AMS C-14 dates on 28 samples, to decipher the sedimentary evolution of the clinoform in response to postglacial sea-level changes. The shallow seismic profiles show that the clinoform comprises three units a lowermost seismic unit (SU 3, less than 2-3 m thick) showing a retrogradational/aggradational stacking pattern with subhorizontal internal reflectors, a middle seismic unit (SU 2, up to 35 m thick) showing a prograding reflection pattern with mostly seaward-stepping reflectors separated by several erosive surfaces, and an uppermost seismic unit (SU 1, maximum thickness 18 m) exhibiting an aggradational reflection pattern with subparallel reflectors. The three seismic units are bounded on the bottom by distinct erosion surfaces. Analyses of the two cores indicate that the clinoform comprises three depositional units, DU 1, DU 2, and DU 3 in descending order, corresponding respectively to SU 1, SU 2, and SU 3. The depositional units are distinguished by lithofacies characteristics and the downcore distributions of benthic foraminiferal and ostracod assemblages. Mineral components of the cores suggest that the clinoform's provenance is predominantly Yellow River-derived sediments. AMS 14 C dates suggest that DU 3 was formed from about 11.6 to 9.6 cal kyr BP, DU 2 from 9.6 to 6.5 cat kyr BP, and DU 1 after ca. 6.5 cat kyr BR Some major meltwater pulse (MWP) events during the deglacial transgression were registered in the clinoform stratigraphy, with the basal surfaces/sediments of DU 3 and DU 2 corresponding respectively to MWP-1B (ca. 11. 6-11.3 cat kyr BP) and MWP-1C (ca. 9.6-9.2 cat kyr BP) events, and with DU 2 being largely formed after the 8.4-8.2 cat kyr meltwater event. Rapid centennial- to multidecadal-scale flooding events were presumably responsible for the erosive surfaces separating the downlapping internal reflectors in SU 2. The change of depositional pattern from progradational in SU 2 to aggradational in SU I is attributed to a change from strong, dominantly to-and-fro tidal currents to the modem circulation in the Bohai Sea as well as to the weakening of the tidal-current field during the highstand after about 6500 cat yr BR As a product of complex interactions among sediment supply, sea-level changes, and hydrodynamic regimes, the clinoform can be regarded as the distal part of the tidal depositional system in the eastern Bohai Sea, which was largely derived from the Yellow River. (c) 2006 Elsevier B.V All rights reserved.
学科主题	第四纪地质
WOS关键词	EAST CHINA SEA ; LAST GLACIAL MAXIMUM ; CONTINENTAL-SHELF ; LATE PLEISTOCENE ; RIVER DELTA ; MELTWATER PULSE ; LEVEL CHANGES ; BOHAI SEA ; EVENT ; DEPOSITION
WOS研究方向	Geology ; Oceanography
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000244255200003
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/38364]
专题	中国地质调查局
作者单位	Qingdao Inst Marine Geol, Qingdao 266071, Peoples R China AIST, Geol Survey Japan, Tsukuba, Ibaraki 3058567, Japan
推荐引用方式 GB/T 7714	Liu, J ,Saito, Y ,Wang, H ,et al. Sedimentary evolution of the Holocene subaqueous clinoform off the Shandong Peninsula in the Yellow Sea[J]. MARINE GEOLOGY,2007,236(3-4):165-187.
APA	Liu, J ,Saito, Y ,Wang, H ,Yang, ZG ,&Nakashima, R .(2007).Sedimentary evolution of the Holocene subaqueous clinoform off the Shandong Peninsula in the Yellow Sea.MARINE GEOLOGY,236(3-4),165-187.
MLA	Liu, J ,et al."Sedimentary evolution of the Holocene subaqueous clinoform off the Shandong Peninsula in the Yellow Sea".MARINE GEOLOGY 236.3-4(2007):165-187.