MODULATED THERMOCONVECTIVE WAVES IN THE EARTH'S LITHOSPHERE
Рубрики: ОРИГИНАЛЬНЫЕ СТАТЬИ
Авторы:
1.
Schmidt United Institute of Physics of the Earth, Russian Academy of Sciences, Moscow, Russia
Тип:
Статья
Страницы:
с 137
по 150
Статус:
Опубликован
Получено:
25.10.1998
Одобрено:
25.10.1998
Опубликовано:
25.10.1998
Язык материала:
английский
Ключевые слова:
thermoconvective waves, Earth's lithosphere, sediments, rheology of rocks.
Аннотация (русский):
For flows associated with small strains, the rheology of rocks is described by a linear integral having a memory law, which reduces to the Andrade law in the case of constant stresses. The continental lithosphere with such a rheology is overstable. Thermoconvective waves propagating through the lithosphere without attenuation have a period of about 200 Ma and a wavelength of the order of 400km. A pointwise perturbation of the initial temperature in the lithosphere excites amplitude-modulated thermoconvective waves wave packets. When the initial perturbation occupies a finite area, thermoconvective waves move outside from this area and thermoconvective oscillations standing waves are settled within the area. Thermoconvective waves induce oscillations of the Earth' surface, accompanied by sedimentation and erosion, and can be viewed as a mechanism for the distribution of sediments on continental cratons.
For flows associated with small strains, the rheology of rocks is described by a linear integral having a memory law, which reduces to the Andrade law in the case of constant stresses. The continental lithosphere with such a rheology is overstable. Thermoconvective waves propagating through the lithosphere without attenuation have a period of about 200 Ma and a wavelength of the order of 400km. A pointwise perturbation of the initial temperature in the lithosphere excites amplitude-modulated thermoconvective waves wave packets. When the initial perturbation occupies a finite area, thermoconvective waves move outside from this area and thermoconvective oscillations standing waves are settled within the area. Thermoconvective waves induce oscillations of the Earth' surface, accompanied by sedimentation and erosion, and can be viewed as a mechanism for the distribution of sediments on continental cratons.
Ключевые слова:
thermoconvective waves, Earth's lithosphere, sediments, rheology of rocks.
thermoconvective waves, Earth's lithosphere, sediments, rheology of rocks.
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