Mantle Dynamics and Plate Kinematics
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منابع مشابه
The role of the Zagros orogeny in slowing down Arabia-Eurasia convergence since ~5 Ma
[1] Large topographic belts along convergent margins have been recognized with the ability to slowdown the kinematics of subduction over geologically short time periods (i.e., few Myr), because their associated gravitational spreading provides significant resistive force within the framework of plate tectonics. The record of past and present-day plate kinematics provides important constraints o...
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Earth's tectonic plates are generally considered to be driven largely by negative buoyancy associated with subduction of oceanic lithosphere. In this context, mid-ocean ridges (MORs) are passive plate boundaries whose divergence accommodates flow driven by subduction of oceanic slabs at trenches. We show that over the past 80 million years (My), the East Pacific Rise (EPR), Earth's dominant MOR...
متن کاملSub-slab seismic anisotropy and mantle flow beneath the Caribbean and Scotia subduction zones Effects of slab morphology and kinematics
Subduction systems are vitally important to plate tectonics and mantle convection, but questions remain about many aspects of subduction dynamics, particularly the nature of sub-slab mantle flow. Observations of seismic anisotropy can shed light on the pattern of mantle flow in subduction systems, but major uncertainties remain regarding the interpretation of sub-slab anisotropy. Here, we prese...
متن کاملSome remarks on subduction zones
The rate of subduction is larger than the convergence rate along W-directed subduction zones, whereas it is smaller along Eor NE-directed subduction zones. Along Wdirected slabs, the subduction rate is the convergence rate plus the slab retreat rate, which tends to equal the backarc extension rate. Along Eor NE-directed slabs, the subduction rate is decreased by the shortening in the upper plat...
متن کاملThe Gyricity of the Earth*
An introductory exploration of the mechanical influence of long-term gyricity or gyroscopic effect on the dynamics of the Earth is presented. Gyricity exists in a deformable, energy-dissipating, and thus rotationally unstable Earth in the form of internal torques, or the rate of change of angular momentum independent of external torques. The kinematics of the internal torques appear compatible ...
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تاریخ انتشار 2011