Results 211 to 220 of about 1,320,036 (257)

Lithosphere mapping beneath the North American plate☆

Lithos, 2004
Abstract Major- and trace-element analyses of garnets from heavy-mineral concentrates have been used to derive the compositional and thermal structure of the subcontinental lithospheric mantle (SCLM) beneath 16 areas within the core of the ancient Laurentian continent and 11 areas in the craton margin and fringing mobile belts.
W.L. Griffin, Suzanne Y. O'Reilly, B.J. Doyle, N.J. Pearson, H. Coopersmith, K. Kivi, V. Malkovets, N. Pokhilenko   +7 more
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Aleutian Plain sediments and lithospheric plate motions

Journal of Geophysical Research, 1971
Airgun reflection profiles indicate that the relict Aleutian abyssal plain consists of two tongues of well-stratified sediments deposited from turbidity currents which entered the region from a northerly direction. The distribution of the turbidites appears to have been largely governed by a topographic grain imparted to the basement surface by Late ...
E. J. W. Jones, J. Ewing, M. Truchan
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Toroidal-Poloidal Partitioning of Lithospheric Plate Motions

1991
A spherical harmonic expansion of tectonic plate motions on the Earth requires both poloidal and toroidal harmonics. Each spectrum decays fairly uniformly as l-2 (l is the spherical harmonic degree), and the toroidal-poloidal ratio of the degree power is between 0.5 and 1.0 for all degrees up to 128.
Richard J. O’Connell, Carl W. Gable, Bradford H. Hager   +2 more
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Displacement of dipping slabs of lithosphere plates

Earth and Planetary Science Letters, 1972
Abstract Among the problems arising from the theory of plate tectonics is the question of what happens at the front of a drifting continent where a downgoing slab, being joined with this front, is displaced towards the oceanic side. The slab forms a separating wall, and on its displacement large quantities of the asthenosphere and mesosphere must be ...
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Geometric regularities of the lithosphere plate structure

Astronomical & Astrophysical Transactions, 2000
Abstract It is shown that the positions of the centres of the main and medium plates display an elegant order and allow us to bring into consideration the special lithosphere reference system (LRS). The following notions are introduced: the lithosphere equator, north and south poles of the lithosphere, etc.
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5. Rigid plates of lithosphere

2015
‘Rigid plates of lithosphere’ explains that because of the lithosphere’s strength, essentially rigid plates of lithosphere move with respect to one another across the surface of the Earth. Their rigidity allows their rates of relative motion and of their total displacements to be described by rotations about axes passing through the centre of the Earth,
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Seismic Evidence for Sharp Lithosphere-Asthenosphere Boundaries of Oceanic Plates

Science, 2009
Detection of the presence of melt at variable depth beneath two oceanic plates reveals the vertical extent of old oceanic plates.
Hitoshi, Kawakatsu, Prakash, Kumar, Yasuko, Takei, Masanao, Shinohara, Toshihiko, Kanazawa, Eiichiro, Araki, Kiyoshi, Suyehiro   +6 more
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Shear stress on the base of a lithospheric plate

pure and applied geophysics, 1977
This paper is a review of the theoretical and observational evidence bearing on the magnitude of the shear stress which acts on the base of a lithospheric plate. Estimates based on the viscosity of the upper mantle do not yield useful limits. Arguments based on the thermal stability of the upper mantle indicate that the basal shear stress is no larger ...
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Geotherms, evolution of the lithosphere and plate tectonics

Tectonophysics, 1981
Abstract For the purpose of calculating Precambrian geotherms, modern “average” geotherms need to be defined. Curves calculated from estimated plate sections are close to those of Clark and Ringwood (1964). Thicknesses of lithospheric plates at any time in the past can be estimated from “fossil” geotherms. Because subduction of oceanic plates depends
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Lithospheric boundaries and plate motions in the Cyprus area

Tectonophysics, 1999
Abstract Accurate location of earthquakes recorded by seismographs and reliable fault plane solutions of strong recent earthquakes are used to define the plate boundaries and the pattern of plate motion in Cyprus and surrounding area.
B.C Papazachos, Ch.A Papaioannou
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