Институт вычислительной математики и математической геофизики СОРАН


numerical solution of DE and IE

Modeling of convection in the upper mantle beneath the lithosphere in Eurasia

Chervov V.V., Chernykh G.G.

Trofimuk Institute of Petroleum Geology and Geophysics SB RAS (Novosibirsk)

Numerical simulation of thermal convection performed under a continental area of Eurasia, comprising Russian platform, West Siberian plate, Siberian platform, Central Asian and Ural folded belts, Tarim, Northwest China and South China kratons. Thickness of the ancient lithosphere platforms such as Siberia, Tarim and Chinese platform are 200-250 km, while to the West-Siberian plate lithosphere thickness not exceeding 130 km. In rift valleys and folded belt is a thinning of lithosphere as 40 km. Such variation power lithosphere, significantly influence the nature of mantijnyh currents. To describe the current in the Earth's upper mantle is a modification developed by numerical models, based on an implicit method of splitting physical processes, poor compressibility method and spherical geometry. The calculations have been carried out in a spherical sector 0 ° ≤ φ ≤ 150 °, 10 ° ≤ θ ≤ 5671km ≤ 80 °, R ≤ 6371km. Main results are as follows. Numerical model of three-dimensional convection built Eurasia region from Meridian to the 150-th and 10 degree latitude to 80th in the North, encompassing the area with increased output of lithosphere (Russian and Siberian platform, Tarim, etc.). Thermal simulation confirmed the emergence of natural local overheating under blocks with increased power, leading to a lithosphere upstream in the mantle. This work was partially in favour of SB RAS integration project No. 44, the RFBs grant No. 02-05-05 and 08-00276-00926.

Note. Abstracts are published in author's edition

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