Study On Large Scale Satellite Gravity Data Processing Method

The South China region is located at the joint of the Pacific and Tethys domains and has undergone multiple stages of mineralization which is forming a number of special geological phenomena and world-class deposits.It is includes study of the mainland.Dynamic evolution,metallogenic regularity and ideal areas for exploring deep Earth information.To identify the root causes of the formation and evolution of natural resources in South China,deep investigations must be conducted to determine the boundaries and deep structures of major geological bodies.Regional gravity data is one of the main methods for studying large-scale geological problems.Satellite gravity data has the characteristics of high global coverage,unified data,non-confidentiality and freedom from geographical constraints.It is one of the best ways to carry out large-scale geological research at the present stage.The paper collects and compares the satellite gravity and terrain data that have been publicly released and introduces EIGEN-6C4 satellite gravity data and Etopo1 terrain data as the research data of the paper.The paper uses the spherical gravity correction method to correct the satellite gravity data with spherical surface.Comparing the results of the spherical correction of satellite gravity data with the gravity anomalies of gravity measured by the ground,the spherical gravity correction method can accurately correct the satellite gravity data.When studying the gravitational field in South China,the paper introduces the original data of satellite gravity to get rid of the bounds of the ground gravity data.In the inversion calculation,it can effectively avoid the problems of edge expansion and edge effect and improve the inversion quality of regional problems.At the same time,the gravity anomalies of satellites in South China were obtained by using the method of spherical gravity correction and the Crust1.0 information of the global three-dimensional crust model to remove the gravitational influence of sediments.According to Feng Rui etal modified Park-Oldenburg formulas,a density interface inversion program was developed to perform density interface inversion to obtain the convincing characteristics of the Moho surface in South China.Combined with previous data,the relationship between the undulating features of the Moho surface and the ore-forming zones in the metallogenic belt is discussed:(1)The morphology of the Moho surface in the eastern Yangtze River middle and lower reaches of the metallogenic belt and the eastern section of the Qinhang metallogenic belt is generally Qianlong.The mantle source material plays a dominant role in the ore formation of this area,forming a pro-border copper and gold Polymetallic deposits;(2)The Moho surface morphology in the Nanling metallogenic area is generally represented by depressions and local inclusions of domes.It is inferred that the ore-forming materials are mainly crust-derived materials and some of them contain mantle-derived materials resulting in the formation of crust-derived sources.Tungsten and tin metal deposits;(3)The shape of the Moho surface in the Wuyi metallogenic belt is generally presented as “two indentations and one uplift”,which may indicate that the formation of metallogenic belt is the result of multi-stage mineralization.The lithogenic ore-forming materials mainly consist of crustal material and contain a small amount of mantle material which forms silver,gold,lead-zinc and copper ore with shallow low temperature.