3D Density Model for the Lithosphere of Alxa Block based on Gravity Inversion using Adaptive Inversion Grid Refinement in Spherical Coordinates

1 Inctroduction The study of the earth's gravitational field is an important part of the explanation of the law of evolution and the distribution of materials on the earth.Gravity satellite is a new space exploration technology rising in the 21st century,which can provide global-scale gravity measurement data,and scientists have carried out extensive research using gravity satellite data.Gravity inversion is commonly used to describe the density structure of the crust and the mantle,providing insights into geological evolution and geodynamic processes.