Sedimentary processes of central South Yellow Sea since the mid-Holocene based on grain size and organic matter indexes

Pi Zhong; Li Tiegang; Lei Yanli

doi:10.3969/j.issn.0253-4193.2019.11.008

Volume 41 Issue 11

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Pi Zhong，Li Tiegang，Lei Yanli. Sedimentary processes of central South Yellow Sea since the mid-Holocene based on grain size and organic matter indexes[J]. Haiyang Xuebao，2019, 41(11)：75–88，doi:10.3969/j.issn.0253−4193.2019.11.008

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Sedimentary processes of central South Yellow Sea since the mid-Holocene based on grain size and organic matter indexes

doi: 10.3969/j.issn.0253-4193.2019.11.008

Pi Zhong^{1, 3},
Li Tiegang^{2, 3, 5
,
,},
Lei Yanli^{1, 3, 4
,
,}

1.
Department of Marine Organism Taxonomy & Phylogeny, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
2.
Key Lab of Marine Sedimentology and Environmental Geology, First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China
3.
University of Chinese Academy of Sciences, Beijing 100049, China
4.
Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China
5.
Laboratory for Marine Geology, Pilot National Laboratory for Marine Science and Technology(Qingdao), Qingdao 266061, China

Received Date: 2018-07-11
Rev Recd Date: 2018-11-15

Available Online: 2021-04-21

Publish Date: 2019-11-25

Abstract

Abstract

The sedimentary environment of the South Yellow Sea (SYS) is complex under the interaction of sea and land. It has always been the focus and difficulty for sedimentary mechanism researches. In this study, multi-index records, including 196 samples of grain size and bulk organic matter indexes (TOC, TN, TOC/TN, and δ¹³Corg) of a gravity Core Z1 from the central South Yellow Sea mud area were obtained. Five layers of AMS¹⁴C age were determined and the highest resolution was 11 a/cm. Our results reveal that the sedimentary processes of central SYS since 6.1 ka BP could be generally divided into three stages: (1) During 6.1–5.2 ka BP, the sediments had the coarsest mean grain size and were mainly residual sand and terrestrial coarse-grained matters, the content of organic matter was very low and primarily terrigenous materials. The variation of mean grain size and organic matter content were both influenced by strong East Asian Monsoon. The low preservation efficiency of organic matter in turbulent marine environment and the remarkable dilution effect of large quantity of terrestrial input were other reasons for lower organic content. (2) During 5.2–3.9 ka BP, the sediment mean grain size was thinner with fluctuating amplitude, the organic matter was increasing and mainly marine materials. They were concerned with weakening East Asian Winter Monsoon. The increase of marine organic matter was related to the increasing influence of Yellow Sea Warm Current. (3) Since 3.9 ka BP, the mean grain size of the sediments was the smallest and relatively constant, the organic matter content was continuously increased to 1.9 ka BP, and then stabilize. They were chiefly controlled by the modern circulation system and East Asian Winter Monsoon. The mean grain size and the overall organic matter indexes explain the complexity of sedimentary environment evolution of the central South Yellow Sea mud area. High-resolution records of sedimentary environment evolution obtained in this study could provide data for sedimentary mechanism researches, moreover, which have certain instruction significance on paleoclimate and paleoceanography of the SYS.
- paleoceanography,
- Yellow Sea Warm Current,
- Yellow Sea Cold Water Mass,
- mean grain size,
- bulk organic matter indexes

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