HR: 0800h
AN: V21D-0644    [Abstracts]
TI: Influence Of Phase Transition And Interaction Between Hot Spots On Convection In The Upper Mantle
AU: Sharapov, V
EM: vik@uiggm.nsc.ru
AF: UIGGM SB RAS, 3, pr. ak. Koptyuga, Novosibirsk, 630090 Russian Federation
AU: * Perepechko, Y
EM: Yuri_perepechko@online.sinor.ru
AF: UIGGM SB RAS, 3, pr. ak. Koptyuga, Novosibirsk, 630090 Russian Federation
AU: Perepechko, L
EM: ludmila@itp.nsc.ru
AF: ITP SB RAS, 1, pr. ak. Lavrentyeva, Novosibirsk, 630090 Russian Federation
AB: The mathematical modeling is widely used for study of convection in the upper mantle (with different approaches). The models of flow dynamic in the upper mantle includes, usually, one phase transition at the depth of 480 km and only hot spot. This paper presents simulation for model of the upper mantle with several hot spots in close arrangement and deals with the effect of their interaction on flow dynamics in the mantle beneath the oceanic and continental crust. Our computations demonstrate a drastic change in the flow mode in the mantle for the case of two interacting hot spots. Further increment of hot spots does not change the mantle flow pattern. The stress distributions in the upper lithosphere above the zones of anomalous mantle were the object for simulation; these distributions produce the hot shearing zones. We believe that interaction of several hot spots might be significant for development of intraplate continental basic melts, including the case of flood-basalt formations (LIP). For this situation, as simulation evidences, we have to take into account all phase transitions in the upper mantle and lithosphere; these transitions are crucial for lithosphere structure. This work was supported by the RFBR (Grant No. 04-05-64107), the Presidium of SB RAS (Grant 106), the President's Grants (NSh-2118.2003.5, NSh-1573.2003.5).
DE: 8120 Dynamics of lithosphere and mantle: general (1213)
DE: 8121 Dynamics: convection currents, and mantle plumes
DE: 8137 Hotspots, large igneous provinces, and flood basalt volcanism
SC: Volcanology, Geochemistry, Petrology [V]
MN: Fall Meeting 2005