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Ridge propagation in the eastern Gulf of Mexico from integrated geophysical modeling

Two drastically different oceanic crustal domains are interpreted in the eastern Gulf of Mexico based on the integrated analysis of seismic, gravity and magnetic data. The 2D profile modeling confirmed the ridge propagation in the Eastern Gulf of Mexico inferred from the prior spatial analysis of satellite gravity. The modeling suggests that the older oceanic crust represents a uniform layer of moderately dense and highly magnetic rocks resulted from an ultra-slow spreading presumably in Late Jurassic. In contrast, the younger oceanic crust toward the center of the basin (produced during slow spreading in Early Cretaceous) is thicker and has a characteristic two-layered structure. The presence of two drastically different domains is consistent with seismic refraction data and suggests the major ridge reorganization that occurred during the opening of the Gulf of Mexico presumably around 150 Ma. The two-phase spreading explains the known asymmetry of the eastern part of the basin that is challenging to explain with a single-stage opening, as well as observed crustal seismicity that was previously interpreted as “intraplate”. The ridge propagation during the opening of the eastern Gulf of Mexico offers a novel way of the basin reconstruction.