Abstract
The Sichuan Basin magnetic anomaly is the most striking regional aeromagnetic anomaly in South China. It is characterized by a continuous large-scale linear magnetic anomaly and contains long-wavelength constituents which could still be detected on satellites. However, Sichuan Basin is covered by 4 to 10 km thick non-magnetic sedimentary layers from Neoproterozoic to Cenozoic, which conceals the magnetic sources in the Precambrian basement and makes it difficult to explore the geological origin of the Sichuan Basin magnetic anomaly. In this study, we applied 3D inversion to the magnetic data, and then compared our inverted susceptibility model with geological maps. We found that the spatial distribution of the Sichuan Basin magnetic anomaly controls the range of the rigid basement beneath Sichuan Basin and it is surrounded by the widespread Neoproterozoic magmatic complexes. Based on our analysis, we proposed that the geological origin of the Sichuan Basin magnetic anomaly might be related to the craton-scale Neoproterozoic magmatic event, which has played an important role in the stabilization of the basement and the evolution of the deep crust in Sichuan Basin.
Highlights
There is a large linear aeromagnetic anomaly in Sichuan Basin, South China, extending continuously more than 1000 km with a broad width of ca. 100 km
Sichuan Basin is covered by non-magnetic 4 to 10 km thick sedimentary layers, and the magnetic source is not exposed on surface, so the strongly magnetized rocks for the magnetic anomaly should be in the Precambrian basement of Sichuan Basin
Sichuan Basin magnetic anomaly reveals the magnetization difference of the basement, and it has attracted the interests of many researchers to study its origin (Zhang et al 1995; Luo 1998; Gu and Wang 2014; Xiong et al 2015)
Summary
There is a large linear aeromagnetic anomaly in Sichuan Basin, South China, extending continuously more than 1000 km with a broad width of ca. 100 km. Sichuan Basin magnetic anomaly reveals the magnetization difference of the basement, and it has attracted the interests of many researchers to study its origin (Zhang et al 1995; Luo 1998; Gu and Wang 2014; Xiong et al 2015). Some researchers thought it might reflect the strongly magnetized intrusions beneath the basin (Luo 1998; Guo et al 2016); there is no direct proof to determine its geological origin. The geological origin of the Sichuan Basin magnetic anomaly is still not clear
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