The depositional feature and spatial distribution of the northern flank of the abandoned subaqueous Yellow River Delta off the Lianyungang coast, western South Yellow Sea

Qin Yachao; Gu Zhaofeng

doi:10.3969/j.issn.0253-4193.2019.11.010

Volume 41 Issue 11

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Qin Yachao，Gu Zhaofeng. The depositional feature and spatial distribution of the northern flank of the abandoned subaqueous Yellow River Delta off the Lianyungang coast, western South Yellow Sea[J]. Haiyang Xuebao，2019, 41(11)：101–116，doi:10.3969/j.issn.0253−4193.2019.11.010

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The depositional feature and spatial distribution of the northern flank of the abandoned subaqueous Yellow River Delta off the Lianyungang coast, western South Yellow Sea

doi: 10.3969/j.issn.0253-4193.2019.11.010

Qin Yachao^{1, 2
,},
Gu Zhaofeng^{1, 2}

1.
Key Laboratory of Gas Hydrate, Ministry of Natural Resources, Qingdao Institute of Marine Geology, Qingdao 266071, China
2.
Laboratory for Marine Mineral Resources, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266071, China

Received Date: 2018-10-23
Rev Recd Date: 2018-12-16

Available Online: 2021-04-21

Publish Date: 2019-11-25

Abstract

Abstract

Shallow seismic profiles, 16 sediment vibrocores, and AMS ¹⁴C ages of foraminifers and a freshwater snail (Parafossarulus striatulus (Benson)) were used to recognize the depositional architecture, the accumulation depths, and the sediment compositions of the northern flank of the abandoned subaqueous Yellow River Delta off the Lianyungang coast, western South Yellow Sea, and further to classify the geographical units and their distribution. The facies of the adjacent shallow transgressive deposits were also distinguished to recognize their paleo-environments. Results show that the subaqueous deposits are divided geographically into two units of delta front and prodelta. Both of them juxtapose along the Lianyungang coast. The delta front is located off the coast between the Liezi River and New Huaihe River mouths. It is a fan-like clinoform, prograding towards NNE and inclining towards NW. It contains two lobes named the Guanhe Lobe and its eastern lobe. Both of them make up the main depocenters. The delta front is mainly composed of sandy deposits, with some muds or sandy muds in the eastern interdistributary bay between the two lobes. The prodelta is located northwest of the delta front, extending off the Liezi River mouth towards Haizhou Bay. It is accumulated by thin mud deposits with vertically homogeneous distribution. Two cores in its northern portion reveal the thicknesses of 1.8 m and 1.5 m, respectively. The transgressive sand sheet is located north of the subaqueous delta, with a thickness of ~20 cm. It is widely present in the study area. Off the Lianyungang coast, however, it is covered by Yellow River-derived sediments and thus underlies the abandoned Yellow River Delta. This sand sheet is characterized by an erosional and relict morphology. Land–sea transition facies are widely present below these transgressive sands, which were formed during the MIS 3 of the Late Pleistocene. It consists of yellow silts or sandy silts, containing many foraminifera and ostracoda as well as freshwater snails.
- shallow seismic profile,
- sediment core,
- delta front,
- prodelta,
- transgressive deposits,
- South Yellow Sea

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