Temperature-dependent transient creep and dynamics of cratonic lithosphere

Birger, B. I.

doi:10.1093/gji/ggt288

Cited by 12 publications

(3 citation statements)

References 24 publications

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“…The application of Andrade's rheological model, which describes the transient creep, leads to oscillatory convective insta bility with a period of about 100 Ma, which corre sponds to the observed periodicity in the sedimenta tion (Birger, 1998;2012;2013). After the release of the compressive stresses, the linear creep deformations disappear, whereas the brittle deformations, which are irreversible, persist.…”

Section: The Stability Analysis Of the Flow Caused By Horizontal Compmentioning

confidence: 73%

“…For the slower processes characterized by the larger τ, inequality (18) gives a thinner elastic crust. For example, in the case of con vective oscillations of the lithosphere, which have a period of ~3 × 10 8 yr, the thickness of the elastic crust is at most 7 km (Birger, 2013). The lithosphere deter mined as a cold boundary layer formed by thermal convection in the mantle is much thicker than its upper elastic layer (elastic crust).…”

Section: The Rheology Of the Lithosphere And Its Depth Heterogeneitymentioning

confidence: 99%

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Rheology of the lithosphere and the folding caused by horizontal compression

Birger

2015

Izv., Phys. Solid Earth

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The laboratory tests of rock specimens show that transient creep, at which deformations increase with time whereas strain rate decreases occurs when creep strains are sufficiently small. Since plate tectonics only permits small deformations in the lithospheric plates, the creep of the lithosphere is transient (non steady state). In this work, we study how the rheology of the lithosphere that possesses elasticity, brittleness (pseudo plasticity), and creep affects the folding in the Earth's crust. Folding is caused by horizontal com pression that results from the collision between the lithospheric plates. The effective viscosity characterizing the transient creep is lower than in the case of a steady state creep and depends on the characteristic time of the considered process. The allowance for transient creep gives the distribution of the rheological properties of the horizontally compressed lithosphere in which the upper crust is brittle, whereas the lower crust and mantle lithosphere are dominated by transient creep. It is shown that the flows that arise in the lithosphere due to the instability under horizontal compression and cause folding are small scale. These flows are con centrated in the upper brittle crust, they determine the short wave Earth's surface topography, penetrate into the lower, creep dominated crust to a shallow depth, and do not penetrate into the mantle. Therefore, these flows do not deform the Moho.

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Section: The Stability Analysis Of the Flow Caused By Horizontal Compmentioning

confidence: 73%

Section: The Rheology Of the Lithosphere And Its Depth Heterogeneitymentioning

confidence: 99%

Rheology of the lithosphere and the folding caused by horizontal compression

Birger

2015

Izv., Phys. Solid Earth

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“…В работе [Birger, 1998] реология, которая описывается интегральным уравнением, сводящимся к закону Андраде в случае постоянного напряжения, названа реологией Андраде. Реология Андраде применялась автором в предыдущих исследованиях [Birger, 1998;2000;2007;2012;2013;2016], где рассматривались такие геофизические процессы как затухание сейсмических волн, послеледниковые течения в мантии, малоамплитудные конвективные колебания в литосфере, происходящие при малых деформациях и переменных напряжениях. При исследовании этих процессов удобным математическим аппаратом является преобразование Лапласа по времени.…”

Section: Introductionunclassified

Rapid growth of shear strain in weakened zones of the lithosphere

Birger

2019

Физика Земли

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A weakened zone in the lithosphere plunging into the mantle can lead to an earthquake after the application of a shear stress only in the case if the effective viscosity of this zone is very low. At low viscosity, in the short time that elapses after the application of stress, significant displacements of the walls of the zone emerge causing high-amplitude seismic waves. The Andrade law describing the transient creep under constant stress applied at the initial time instant leads to very low effective viscosity a few first seconds after the initial time instant. The effective viscosity also decreases due to the temperature rise in the weakened zone caused by the dissipative release of heat. However, this process is not rapid enough to noticeably change the temperature and effective viscosity in a short time.

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Accumulation of elastic strains in the upper crust on the locked transform faults and the tectonomagnetic effect

Birger

2016

Izv., Phys. Solid Earth

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Temperature-dependent transient creep and dynamics of cratonic lithosphere

Cited by 12 publications

References 24 publications

Rheology of the lithosphere and the folding caused by horizontal compression

Rheology of the lithosphere and the folding caused by horizontal compression

Rapid growth of shear strain in weakened zones of the lithosphere

Accumulation of elastic strains in the upper crust on the locked transform faults and the tectonomagnetic effect

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