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Science 4 October 2002:
Vol. 298. no. 5591, p. 9
DOI: 10.1126/science.298.5591.9g
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The motions of plates on Earth's surface are believed to be coupled to convection in the mantle. Conrad and Lithgow-Bertelloni (p. 207) consider two subducted slab mechanisms, slab pull in the upper mantle, where the subducted slab is attached to the plate and pulls the subducting plate faster than normal toward the subduction zone, and slab suction in the lower mantle, where the subducted slab is detached from the plate and sucks the plate toward the subduction zone by enhanced mantle flow. A plate tectonic simulation with suction and pull reproduces the observed plate tectonic motions and resolves some of the difficulties in understanding the coupling of crust to mantle.




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Science. ISSN 0036-8075 (print), 1095-9203 (online)