Magnetic Inversion and Regional Tectonics of the Dabie Orogen

Physical property inversion techniques are the methods to reveal the internal structures of Earth’s lithosphere. In this study, we introduce an Occam-type inversion algorithm into a spherical coordinate system, and invert the magnetization based on the three-component magnetic anomalies. The synthet...

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Bibliographic Details
Published inMagnetochemistry Vol. 9; no. 3; p. 82
Main Authors Zhang, Liang, Lu, Guangyin, Zhu, Ziqiang, Cao, Shujin, Mao, Yajing, Chen, Xinyue, Wang, Lichang
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.03.2023
Subjects
3D magnetization distribution
Algorithms
Analysis
Cell division
Cretaceous
Dabie orogen
Datasets
Delamination
Geology
Lagrange multiplier
Lithosphere
Magnetic anomalies
Magnetic fields
Magnetic properties
Magnetization
Methods
Orogeny
Spherical coordinates
Subduction (geology)
suture line
tectonic evolution
Tectonics
Tectonics (Geology)
China
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Summary:Physical property inversion techniques are the methods to reveal the internal structures of Earth’s lithosphere. In this study, we introduce an Occam-type inversion algorithm into a spherical coordinate system, and invert the magnetization based on the three-component magnetic anomalies. The synthetic model tests show that the inversion effects of the vertical components are relatively stable, while the anti-noise ability is strong. We apply the algorithm to a set of vertical component anomalies derived from the satellite magnetic field model and obtain Dabie orogen 3D magnetization distribution. Multiple magnetic sources are identified within the orogen and adjacent areas, and the related tectonic evolution processes are analyzed. The significant magnetization characteristics of the orogen can be associated with mantle upwelling caused by the Early Cretaceous lithospheric delamination, along with the partial melting of the mafic–ultramafic lower crust that had not participated in the delamination. The magnetic sources near the Mozitan–Xiaotian fault, and those located in the western Dabie area, are also restricted by Mesozoic and Jurassic–Cretaceous deep melt activities, respectively. The study provides evidence for the suture line position of the plate subduction in the deep lithosphere. Furthermore, the results display certain indications of mineralization activities in the middle–lower Yangtze Valley metallogenic belt.
ISSN:2312-7481
2312-7481
DOI:10.3390/magnetochemistry9030082