Magnetic variations of sediments from a drilling core in the Lingdingyang Bay, Zhujiang River Estuary, and their responses to marine transgression and regression

Wu Yi; Fu Shuqing; Xia Zhen

doi:10.12284/hyxb2021059

Volume 43 Issue 5

May 2021

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Wu Yi，Fu Shuqing，Xia Zhen. Magnetic variations of sediments from a drilling core in the Lingdingyang Bay, Zhujiang River Estuary, and their responses to marine transgression and regression[J]. Haiyang Xuebao，2021, 43(5)：88–99 doi: 10.12284/hyxb2021059

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Magnetic variations of sediments from a drilling core in the Lingdingyang Bay, Zhujiang River Estuary, and their responses to marine transgression and regression

doi: 10.12284/hyxb2021059

Wu Yi^{1, 2, 3
,},
Fu Shuqing^{2, 3
,
,},
Xia Zhen⁴

1.
Key Laboratory of Ocean and Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China
2.
Guangdong Open Laboratory of Geospatial Information Technology and Application, Key Lab of Guangdong for Utilization of Remote Sensing and Geographical Information System, Guangzhou Institute of Geography, Guangdong Academy of Sciences, Guangzhou 510070, China
3.
Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou 511458, China
4.
Guangzhou Marine Geological Survey, Guangzhou 510075, China

Received Date: 2020-02-26
Rev Recd Date: 2020-08-06

Available Online: 2021-02-26

Publish Date: 2021-07-06

Abstract

Abstract

The estuary area of the Zhujiang River Delta is significantly influenced by its drainage and offshore environment. Since being under the interaction of sea and land, the depositional system within the estuary area could be of great potential to reveal the simultaneous succession of geological and geomorphic processes. This paper presents a magnetic investigation report of a sedimentary core drilled from the Lingdingyang Bay at the Zhujiang River Estuary. Results of this study show that, the concentration of magnetic minerals or the source area of the high-coercivity magnetic minerals within the core sediments is relatively constant during the two periods of relatively high sea-level (i.e., under marine transgression) since late Pleistocene, revealing a stable sedimentation environment or a relatively fixed sediment source, respectively; however, during the period of marine regression, when the weathering and denudation processes dominate, the magnetic mineral composition in sediments is characterized by significant large-scale fluctuations, possibly indicating that the source areas of detrital materials have undergone a dramatic climate evolution. Multiple environmental magnetic parameters, including low-frequency magnetic susceptibility, anhysterestic remanent magnetization, saturation isothermal remanent magnetization, and HIRM (the ‘hard’ isothermal remanent magnetization), reveal a synchronous pattern of magnetic variations through the core. In comparison, the S-ratio record of the core sediments is more sensitive to the sedimentation evolution history during the marine transgression and regression in the Lingdingyang Bay at the Zhujiang River Estuary.
- Zhujiang River Estuary,
- sediment,
- magnetic variation

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References

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