Physics
Scientific paper
Apr 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995georl..22..747m&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 22, no. 7, p. 747-750
Physics
9
Energy Transfer, Mathematical Models, Momentum Transfer, Plates (Tectonics), Subduction (Geology), Viscous Fluids, Boundary Conditions, Convergence, Finite Element Method, Gravitational Effects, Lithosphere, Seismology
Scientific paper
Momentum and energy equations are solved simultaneously for an incompressible viscous fluid in order to model the changes in the shape of a subducted slab when active convergence between the subducting and overriding plates comes to the end and slab pull becomes the dominant tectonic mechanism. This model can be applied to the Tyrrhenian domain, where it has been suggested that active convergence terminated about 7-9 Myr ago. During the active phase the angle of immersion of the slab at intermediate depths between 100 and 270 km is small, about 45 deg - 50 deg, and large, about 80 deg - 90 deg, at depths greater than 300 km. The phase of passive gravitational sinking is characterized by a substantial modification in the shape of the slab, with a large angle of immersion of 70 deg now at intermediate depths, decreasing to 50 deg in proximity of the tip of the slab. When the shape of the modeled slab is compared with the seismogenic portion of the subducted Ionian lithosphere in the Tyrrhenian, our results are consistent with subduction driven by slab pull and with cessation of active convergence between 7-9 Myr before present.
Maria Marotta Anna
Sabadini Roberto
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