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Growth and mixing dynamics of mantle wedge plumes

¹ Department of Geosciences, Swiss Federal Institute of Technology (ETH-Zürich), CH-8092 Zurich, Switzerland
² Department of Geology and Geophysics, University of Minnesota, 310 Pillsbury Drive SE, Minneapolis, Minnesota 55455-0219, USA

Recent work suggests that hydrated partially molten thermal-chemical plumes that originate from subducted slab as a consequence of Rayleigh-Taylor instability are responsible for the heterogeneous composition of the mantle wedge. We use a two-dimensional ultrahigh-resolution numerical simulation involving 10 x 10⁹ active markers to anticipate the detailed evolution of the internal structure of natural plumes beneath volcanic arcs in intraoceanic subduction settings. The plumes consist of partially molten hydrated peridotite, dry solid mantle, and subducted oceanic crust, which may compose as much as 12% of the plume. As plumes grow and mature these materials mix chaotically, resulting in attenuation and duplication of the original layering on scales of 1–1000 m. Comparison of numerical results with geological observations from the Horoman ultramafic complex in Japan suggests that mixing and differentiation processes related to development of partially molten plumes above slabs may be responsible for the strongly layered lithologically mixed (marble cake) structure of asthenospheric mantle wedges.

Key Words: numerical modeling • subduction • volcanic arcs • mantle wedge structure • subducted crust melting

This article has been cited by other articles:

				T. V. Gerya, D. Fossati, C. Cantieni, and D. Seward Dynamic effects of aseismic ridge subduction: numerical modelling European Journal of Mineralogy, June 1, 2009; 21(3): 649 - 661. [Abstract] [Full Text] [PDF]