HR: 0800h
AN: T21B-0534    [Abstracts]
TI: Three-Dimensional Numerical Models of Subduction and Subduction-Induced Mantle Flow
AU: * Freeman, J
EM: justin.freeman@anu.edu.au
AF: The Australian National University, Research School of Earth Science, Mills Road, Canberra, ACT 0200 Australia
AU: Stegman, D R
EM: Dave.Stegman@sci.monash.edu.au
AF: Monash University, School of Mathematical Sciences, Wellington Road, Clayton, Vic 3800 Australia
AU: Schellart, W P
EM: wouter.schellart@anu.edu.au
AF: The Australian National University, Research School of Earth Science, Mills Road, Canberra, ACT 0200 Australia
AU: Moresi, L
EM: louis.moresi@sci.monash.edu.au
AF: Monash University, School of Mathematical Sciences, Wellington Road, Clayton, Vic 3800 Australia
AU: May, D A
EM: david.may@sci.monash.edu.au
AF: Monash University, School of Mathematical Sciences, Wellington Road, Clayton, Vic 3800 Australia
AU: Turnbull, R
EM: robert.turnbull@sci.monash.edu.au
AF: Monash University, School of Mathematical Sciences, Wellington Road, Clayton, Vic 3800 Australia
AB: The kinematics of subduction and its influence on mantle convection and plate-scale deformation have been the focus of numerous geodynamic studies [{\it e.g. Garfunkel et al., 1986; Gurnis and Hager, 1988; Zhong and Gurnis, 1995; Christensen, 1996; Olbertz et al., 1997; Conrad and Hager, 1999; Eberle et al., 2002}]. Most geodynamic models have considered only two-dimensional aspects of subduction dynamics by incorporating the assumption that subduction zones are infinite in trench-parallel extent. However, natural subduction zones are intrinsically three-dimensional, due in part to their limited lateral extent. Lateral length scales of natural subduction zones vary from only a few hundred kilometres (e.g. the Calabrian, Hellenic and Scotia slabs) to several thousand kilometres (e.g. the Aleutian, Indonesian, Northwest Pacific and South American slabs). Here, we present results from three-dimensional numerical experiments that simulate lithospheric subduction and subduction induced mantle flow for slabs with a varying lateral extent.
DE: 8100 TECTONOPHYSICS
DE: 8120 Dynamics of lithosphere and mantle--general
DE: 8149 Planetary tectonics (5475)
DE: 5475 Tectonics (8149)
DE: 7218 Lithosphere and upper mantle
SC: Tectonophysics [T]
MN: 2004 AGU Fall Meeting