Architecture and tectonic evolution of nonvolcanic margins: Present‐day Galicia and ancient Adria

摘要: A comparison of the reconstructed southeastern margin Tethys ocean with present-day Galicia shows that although both margins are different age and had a fate, their architectures tectonic evolutions very similar. Along non-volcanic site rifting shifted from broad area in future proximal to localized its distal parts, accompanied by change mode extension. During initial phase rifting, extension was accommodated symmetrically arranged listric faults which soled at midcrustal levels, indicating deformation upper crust decoupled mantle along hot weak lower crust. advanced dominated simple shear low-angle detachment top-to-the-ocean sense movement. These shallow crustal structures formed series breakaways continental cut into rocks, now no longer decoupled. Cooling strengthening during an stage apparently led localization style deformation, documenting evolution nonvolcanic is largely controlled thermal state lithosphere. Seafloor spreading initiated only after exhumation exposure subcontinental on floor may have been loss yield strength mantle, due combination extension, asthenospheric uplift, increased melt production.