Geodynamics and plume tectonics of the Azore-Gibraltar fault zone (North Atlantic) |
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| Authors: | E V Verzhbitsky M V Kononov A F Byakov O V Grinberg |
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| Institution: | 1.Shirshov Institute of Oceanology,Russian Academy of Sciences,Moscow,Russia |
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| Abstract: | Maps of the principal structures and geological-geophysical knowledge for the Azores-Gibraltar and Icelandic regions have
been made. The geodynamic conditions of the Azores archipelago formation have been analyzed. It has been noted that the uplifting
of the Azores plume (as well as the Icelandic one) might have been triggered by near-surface tectonic processes. The computer
modeling has been performed with respect to the coefficients of the geodynamic sinking rates for the Azores fragment of the
Mid-Atlantic Ridge. Based on the modeling results, this rate was ∼1.5 times higher than the average sinking rate for the mid-ocean
ridges of the World Ocean in general. The high sinking rate of the Azores fragment is caused by the influence of the plume
material on the sinking process. Based on the complex analysis of the seismicity, thermal flow, and seismic tomography data
distribution, as well as the implemented numerical calculations, the European (northern) part of the diffuse boundary between
the Eurasian and African plates has been identified for the first time. Along with the African (southern) boundary, it outlines
the identified by the authors West Mediterranean plate. |
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