Sedimentary facies and environmental evolution of the Yangtze shoal, eastern China Sea shelf since Late Pleistocene: Evidence from core YZ05

XU Dailu; YIN Yong; SHI Lianqiang; LIN Wenrong; WANG Aihua; ZHENG Yujun

doi:10.16562/j.cnki.0256-1492.2019050501

2020 Vol. 40, No. 6

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Article navigation > Marine Geology & Quaternary Geology > 2020 > 40(6): 22-38

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XU Dailu, YIN Yong, SHI Lianqiang, LIN Wenrong, WANG Aihua, ZHENG Yujun. Sedimentary facies and environmental evolution of the Yangtze shoal, eastern China Sea shelf since Late Pleistocene: Evidence from core YZ05[J]. Marine Geology & Quaternary Geology, 2020, 40(6): 22-38. doi: 10.16562/j.cnki.0256-1492.2019050501

Citation:

XU Dailu, YIN Yong, SHI Lianqiang, LIN Wenrong, WANG Aihua, ZHENG Yujun. Sedimentary facies and environmental evolution of the Yangtze shoal, eastern China Sea shelf since Late Pleistocene: Evidence from core YZ05[J]. Marine Geology & Quaternary Geology, 2020, 40(6): 22-38. doi: 10.16562/j.cnki.0256-1492.2019050501

Sedimentary facies and environmental evolution of the Yangtze shoal, eastern China Sea shelf since Late Pleistocene: Evidence from core YZ05

1.
School of Geography and Oceanography Science, Nanjing University, Key Laboratory of Coast and Island Development of MOE of China, Nanjing 210023, China
2.
State Research Center for Island Exploitation and Management, Second Institute of Oceanography, MNR, Hangzhou 310012, China
3.
Qingdao Institute of Marine Geology, China Geological Survey, Qingdao 266071, China
4.
Nanjing Geological Survey Center, China Geological Survey, Nanjing 210016, China

Received Date: 05 May 2019

Revised Date: 20 June 2019

Publish Date: 25 December 2020

Abstract

Abstract

A 80 m long core, i.e. the Core YZ05, taking from the Yangtze shoal at the inner shelf of Eastern China Sea, is carefully studied by this paper. Although some preliminary results have been published before, it is still necessary to reexamine the interpretation concerning sedimentary facies and the previous models with the newly acquired information. Based on color, grain size, sedimentary texture and structure, contact relationship and fossils, the Late Pleistocene and Holocene succession of the core YZ05 can be classified into ten environmentally significant facies, which include fluvial channel-point bar (F1), overbank (F2), muddy tidal flat (F3), estuary front (F4), tidal sandy ridge (F5), inter-ridge channel(F6), distributary channel bar (F7), distributary channel (F8), distal delta front (F9) and prodelta (F10). Through the analysis of facies association and facies sequences, with the support of Sr/Ba ratios, a retrogradational estuary sequence and a progradational detaic sequence are recognized, which are similar to the post glacial sequences in the Yangtze River delta. AMS¹⁴C and OSL dating suggest that the deposits penetrated by Hole YZ05 are younger than Late Pleistocene. Then the Yangtze Shoal is sourced from the Late Pleistocene deltaic deposits reworked by tidal current.
- sedimentary facies /
- ancient delta /
- ancient estuary /
- Sr/Ba ratio /
- the Yangtze shoal

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References

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