3D seismic characterization and origination of gravity flow geomorphic units on continental slope: A case study of Lingshui Sag, Qiongdongnan Basin

LI Ling; LI Lei; YAN Huamin; PENG Chenang; CHENG Linyan; GAO Yifan; ZHANG Wei; GONG Guangchuan

doi:10.16562/j.cnki.0256-1492.2022070702

2023 Vol. 43, No. 1

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Article navigation > Marine Geology & Quaternary Geology > 2023 > 43(1): 37-48

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LI Ling, LI Lei, YAN Huamin, PENG Chenang, CHENG Linyan, GAO Yifan, ZHANG Wei, GONG Guangchuan. 3D seismic characterization and origination of gravity flow geomorphic units on continental slope: A case study of Lingshui Sag, Qiongdongnan Basin[J]. Marine Geology & Quaternary Geology, 2023, 43(1): 37-48. doi: 10.16562/j.cnki.0256-1492.2022070702

Citation:

LI Ling, LI Lei, YAN Huamin, PENG Chenang, CHENG Linyan, GAO Yifan, ZHANG Wei, GONG Guangchuan. 3D seismic characterization and origination of gravity flow geomorphic units on continental slope: A case study of Lingshui Sag, Qiongdongnan Basin[J]. Marine Geology & Quaternary Geology, 2023, 43(1): 37-48. doi: 10.16562/j.cnki.0256-1492.2022070702

3D seismic characterization and origination of gravity flow geomorphic units on continental slope: A case study of Lingshui Sag, Qiongdongnan Basin

1.
School of Earth Sciences and Engineering, Xi’an Shiyou University, Xi’an 710065, China
2.
Shaanxi Key Lab of Petroleum Accumulation Geology, Xi’an 710065, China

More Information

Corresponding author: LI Lei, lilei@xsyu.edu.cn

Received Date: 07 July 2022

Revised Date: 05 October 2022

Accepted Date: 05 October 2022

Publish Date: 28 February 2023

Abstract

Abstract

Seafloor topography has always been the key of scientific study. Based on 1000 km² high-resolution 3D seismic data of Lingshui Sag in Qiongdongnan Basin, South China Sea, the GeoFrame platform, Surfer 3D mapping, and other technologies were applied to characterize the current submarine landform of Lingshui Sag. Results show that the lower slope of Qiongdongnan Basin presented mainly three types of geomorphic units: channels (including large channel C1 and gully-lobe complexes G1-G3), cyclic steps, and submarine landslides. The width-depth ratio of channel C1 that was mainly scoured by debris transported via continental slope channels, is between 31.5 and 232. At the ends of G1-G3 of gully-lobe complex developed obvious lobes. The cyclic steps could be identified in the channel and submarine landslides. Squeeze ridges and underwater tongues were developed widely in the main body and the toes of slumps on continental slope. We speculate that the seafloor topography in the Lingshui Sag was mainly caused by submarine landsliding on the upper continental slope, which was intensified by deposit overload and sea level fluctuation, and finally the modern landform was formed.
- seafloor topography /
- channel /
- cyclic steps /
- submarine landslide /
- Qiongdongnan Basin

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References

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