Geodynamic implications of intermediate-depth earthquakes and volcanism in the intraplate Atlas mountains (Morocco)

摘要: Abstract Intermediate-depth earthquakes and igneous activity are unusual in the geodynamic models of intracontinental belts. In Atlas mountains NW Africa, they appear to be coeval related processes this region. Driving forces acting on area including regional boundary conditions investigated suggest a event that leads subcrustal seismic events magmatism styles. This geodynamics concerns period 45 Ma which system experienced Cenozoic tectonic inversion previous Mesozoic extensional basins. Keeping mind role pre-existing about represents only 1% age Earth. Thus 99% tectonics ignored. The interaction with Eurasia, Alboran rifting Burdigalian, provide lateral constraints Moroccan A realistic model for region is oceanic bodies, driven by collision have been moved horizontally into surrounding African boundaries. These associated induced subduction some 25 should resulted thickening lithosphere, but such not observed. It proposed present crustal velocity geoelectric structures, negative Bouguer gravity, magmatic evidence rapid uplift, addition localized high heat flows, can better explained terms delamination event. accounts two distinct magmatism, absence roots history sublithospheric seismicity. Such mechanism offers perspectives relating intermediate-depth volcanic even though their occurrence separated time delay 0.5 at least.