An improved Tilt Derivative Method Combined with the MMTs E Using in Fracture System Identification for the SWIR 49° E Area

Abstract

Seafloor hydrothermal sulfide deposits occurring at plate boundaries and convergent plate boundaries, are mainly concentrated in extensional tectonic belt with abundant fault structure, which is always correlated with the severe potential field signals changes. Considering the common magnetic anomaly components cannot reflect the field sources correctly as magnetic field around the ocean ridges is extremely infected by the residual magnetism, based on the obvious superiority of the magnitude magnetic transforms (MMTs) centricity and low dependence on the magnetization vector direction, we used the MMTs for geological boundaries identification. We improved the Tilt derivative method to indentify the boundaries of the geological structure on the basis of both the MMTs E and R, and find that the MMTs E combined with the improved Tilt derivative method performs better . We applicant this method in the 49° E zone (48°E~52°E,-39°S~-37°S) of the Southwest India Ridge (SWIR), with the help of the 2-arc minute high resolution magnetic model EMAG2, the fault system distribution of the study area was obtained and described primarily.