Crustal Density Inversion and Its Tectonic Structure in Badong-Zigui Area

WANG Ze; WU Yunlong; ZHANG Yi; YAO Yunsheng

doi:10.13203/j.whugis20190344

Volume 45 Issue 11

Nov. 2020

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Geomatics and Information Science of Wuhan University > 2020 > 45(11): 1763-1770. > DOI: 10.13203/j.whugis20190344

WANG Ze, WU Yunlong, ZHANG Yi, YAO Yunsheng. Crustal Density Inversion and Its Tectonic Structure in Badong-Zigui Area[J]. Geomatics and Information Science of Wuhan University, 2020, 45(11): 1763-1770. DOI: 10.13203/j.whugis20190344

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Crustal Density Inversion and Its Tectonic Structure in Badong-Zigui Area

WANG Ze^1,,
WU Yunlong^{1, 2, ,},
ZHANG Yi¹,
YAO Yunsheng²

1.
Key Laboratory of Seismic Geodesy, Institute of Seismology, China Earthquake Administration, Wuhan 430071, China
2.
School of Geological Engineering, Institute of Disaster Prevention, Sanhe 065201, China

Funds:

The National Key Research and Development Program of China 2018YFC1503503-01

the National Natural Science Foundation of China 41931074

the National Natural Science Foundation of China 41572354

the National Natural Science Foundation of China 41974096

the National Natural Science Foundation of China 41704082

the Natural Science Foundation of Hubei Province 2017CFB435

Special Project of Basic Scientific Research Operating Expenses of Institute of Seismology, China Seismological Administration

Special Project of Basic Scientific Research Operating Expenses of Institute of Crustal Stress, China Seismological Administration IS201616249

the Pre-research Project of Civil Aerospace of State Administration of Science, Technology and Industry for National Defense D010103

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Author Bio:
WANG Ze, postgraduate, specializes in gravity data processing and study of internal structural characteristics of the Earth. E-mail: wangze_geol@163.com
Corresponding author:
WU Yunlong, PhD, associate professor. E-mail: yunlongwu@gmail.com
Received Date: September 11, 2019
Published Date: November 18, 2020

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Abstract

Abstract

Objectives The Badong-Zigui Basin is located in the west of the Three Gorges area, and it is surrounded by four different tectonic units: With the Xuefengshan thick-soil tectonic belt on the south, the Qinling orogenic belt on the north, the Huangling anticline on the east, and the eastern extension of the Sichuan Basin in the west. The Badong-Zigui basin is a north-south syncline structure, the sediments in the basin are dominated by Late Triassic-Late Turassic argillaceous rocks, and the special tectonic setting causes strong tectonic activities in the basin.
Methods Using a three-dimensional gravity inversion algorithm based on Lagrangian multiplier constraints, the local Bouguer gravity anomaly in Badong-Zigui area is inverted, and the underground three-dimensional density structure of Badong-Zigui and adjacent areas is obtained.
Results The inversion results show that the Zigui Basin is a low-density area compared with the surrounding area. The sedimentation thickness in the east is deeper than that in the west, and the sediment density is lower than that in the west. The small and medium earthquakes in the area are basically 4-12 km underground.
Conclusions The north-south and north-east ancient water flows in the northern edge of the Zigui Basin successively provide sources for the sedimentation and filling of the basin, forming a structure with lower material density and deeper deposits in the eastern part of the basin; low-density materials in the east are transported and accumulated to the west in the basin. At the same time, it is squeezed by the eastward extension of the Sichuan Basin, and it is speculated that there is a tendency of east-west movement and compression in the basin.
- Zigui basin,
- gravity inversion,
- density structure,
- tectonic characteristics

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