Quantitative characterization and influencing factors of modern bioturbation structure in the Changjiang River Estuary and its adjacent areas

Zhang Xin; Fan Dejiang; Cheng Peng; Liu Xiaohang; Zheng Shiwen

doi:10.12284/hyxb2023141

Volume 45 Issue 10

Oct. 2023

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Zhang Xin，Fan Dejiang，Cheng Peng, et al. Quantitative characterization and influencing factors of modern bioturbation structure in the Changjiang River Estuary and its adjacent areas[J]. Haiyang Xuebao，2023, 45(10)：70–86 doi: 10.12284/hyxb2023141

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Quantitative characterization and influencing factors of modern bioturbation structure in the Changjiang River Estuary and its adjacent areas

doi: 10.12284/hyxb2023141

Zhang Xin^1
,,
Fan Dejiang^{1, 2
,
,},
Cheng Peng¹,
Liu Xiaohang¹,
Zheng Shiwen^{2, 3}

1.
College of Marine Geosciences, Ocean University of China, Qingdao 266100, China
2.
Key Lab of Submarine Geosciences and Prospecting Techniques, Ministy of Education, Ocean University of China, Qingdao 266100, China
3.
College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China

Received Date: 2023-02-16
Rev Recd Date: 2023-05-12

Available Online: 2023-11-06

Publish Date: 2023-10-30

Abstract

Abstract

The bioturbation structure is an important indicator of the state of the seabed environment and the main basis for the reconstruction of the paleosedimentary environment; moreover, it affects the early diagenesis of sediments and the redistribution of materials, and becomes the interference factor for the interpretation of the 100-year scale sedimentary records. In this article, sediment cores from 21 stations in the Changjiang River Estuary and its adjacent areas were characterized qualitatively and quantitatively by using high-resolution X-ray computed tomography technology, and the main factors affecting the bioturbation structures were analyzed. The result shows that the bioturbation structures in the Changjiang River Estuary and its adjacent areas are relatively developed, which can be divided into four types: biodiffusor structures, conveyor structures, regenerator structures and gallery-diffusor structures. Conveyor structures and gallery-diffusor structures are common. The bioturbation structure is distributed in various forms in the core, including exponential attenuation type, wave attenuation type, uniform distribution type, pulse distribution type and other vertical distribution forms. The depth of disturbance varies, most of which are within 20 cm, but some are more than 40 cm. The bioturbation structures are spatially uneven. The Changjiang River Estuary and the inner shelf are relatively developed, with a disturbance inventory of 0–13 972 mm³, while the northern Jiangsu coast and the middle continental shelf are less, with a disturbance inventory of 351–3 212 mm³. The bioturbation structures from the coast to the outside have a decreasing trend. The development degree of bioturbation structure is mainly restricted by the type of bottom material and sedimentation rate. Clay silt and suitable sedimentation rate (0.52–1.34 cm/a) are conducive to the development and preservation of bioturbation structures.
- the Changjiang River Estuary and its adjacent areas,
- bioturbation structure,
- three-dimensional reconstruction,
- space distribution,
- influence factor

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References(49)

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