HR: 0830h
AN: T41C-0246    [PDF]
TI: Blob Tracing Models for the Central Mexican Volcanic Belt
AU: * Manea, V
EM: vlady@ollin.igeofcu.unam.mx
AF: Dept. Seismology/Institude Geophysics/UNAM, Ciudad universitaria, Circuito de la Inv. Cient., Mexico, df 04510 Mexico
AU: Manea, M
EM: mary@ollin.igeofcu.unam.mx
AF: Dept. Seismology/Institude Geophysics/UNAM, Ciudad universitaria, Circuito de la Inv. Cient., Mexico, df 04510 Mexico
AU: Kostoglodov, V
EM: vladimir@ollin.igeofcu.unam.mx
AF: Dept. Seismology/Institude Geophysics/UNAM, Ciudad universitaria, Circuito de la Inv. Cient., Mexico, df 04510 Mexico
AU: Sewell, G
EM: sewell@math.utep.edu
AF: University of TExas, El Paso, P.O.Box 12141, El Paso, tex 799137 United States
AB: The numerical model of steady state temperature and velocity fields in the mantle wedge of the Central Mexican Volcanic Belt (CMVB) is used to compute a dynamic model of buoyant blob tracing in the non-newtonian mantle wedge velocity field. Considering that the main component of the volcanic material is generated by the melting processes on the subducting plate surface, a dynamic model simulating the motion of detached blobs in a viscous mantle wedge flow was developed. The blob's motion is determined by the action of drag, mass, and buoyancy forces in the mantle wedge velocity field. The blobs of the realistic diameter of 0.2 - 2.0 km show very different trajectories only at very low wrapping viscosity ( ~ 1015 Pas). The blob rise time which is necessary to reach the bottom of the continental crust is from 0.04 up to 12.5 million years depending on the plume diameter and surrounding viscosity.
DE: 3210 Modeling
DE: 3230 Numerical solutions
DE: 3660 Metamorphic petrology
DE: 8121 Dynamics, convection currents and mantle plumes
SC: Tectonophysics [T]
MN: 2003 Fall Meeting