نتایج جستجو برای: asthenosphere
تعداد نتایج: 575 فیلتر نتایج به سال:
The tectonic evolution of the southeastern Tibetan Plateau is key to understanding mechanism growth whole Plateau. Its imprint on lithospheric and asthenospheric mantle rock fabrics expected have a strong signature seismic anisotropy. In this study, we measure splitting delays fast polarization directions (FPD) with minimum-transverse-energy intensity methods using core-refracted phases (e.g., ...
recently, the s receiver function method has been successfully developed to identify upper mantle interfaces. s receiver functions have the advantage of being free of s-wave multiple reflections and can be more suitable than p receiver function for studying mantle lithosphere. however, because of specific ray geometry of the s-to-p converted waves, the s receiver function method has some techni...
The key to the origin of carbonatite and kimberlite lies in the system CaOMg0-Si0 2 -C0 2 . Increase in pressure causes a carbonation reaction in the peridotite assemblage as follows: forsterite + clinopyroxene + C 0 2 ^ orthopyroxene + carbonate (Ca:Mg::70:30). This reaction passes through 15 kb-960°C with slope 45 b/°C and terminates at an invariant point near 25 kb-1200°C, where melting begi...
We suggest a method of fitting of a zero-range model of a tectonic plate under a boundary stress on the basis of comparison of the theoretical formulae for the corresponding eigenfunctions/eigenvalues with the results extraction under monitoring, in the remote zone, of non-random (regular) oscillations of the Earth with periods 0.2-6 hours, on the background seismic process, in case of low seis...
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