The Specific Features of the Geodynamic Settings in the Southeastern Part of the Magellan Seamounts, Pacific Ocean

Abstract

Based on a detailed bathymetric map of the southeastern part of the Magellan Seamounts created using the results of multibeam echo sounding, a lineament analysis of the seafloor relief was performed, linear landforms were distinguished and their azimuths were measured, and a rose diagram was constructed showing the lineament direction in the area. Models of the deep and subsurface deformation fields of the area that identify blocks with predominant extension and compression stresses were constructed. The block motions occur along the lines of sign changes of the stresses (block boundaries). The directions of the block boundaries are compared with the lineament direction and a conclusion is made on their spatial and genetic relationship. The systems of directions of the linear landforms and the boundaries of deep and shallow blocks are partially consistent with four main systems of the global regmatic network, which indicates a significant influence of the latter on the structural plan of the area. The stress redistribution is related to modern geological processes that lead to the formation of new features of the seafloor relief and partial destruction of the old guyot surfaces.