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Episodic slab rollback makes it easy for HP rocks to be exhumed

Abstract : The burial-exhumation cycle of crustal material in subduction zones can either be driven by the buoyancy of the material, by the surrounding flow, or by both. High pressure ­ ultrahigh pressure rocks are chiefly exhumed where subduction zones display transient behaviors, which lead to contrasted flow regimes in the subduction mantle wedge. Subduction zones with stationary trenches (mode I) favor the burial of rock units, whereas slab rollback (mode II) moderately induces an upward flow that contributes to the exhumation, a regime that is reinforced when slab dip decreases (mode III). Episodic regimes of subduction that involve different lithospheric units successively activate all three modes and thus greatly favor the exhumation of rock units from mantle depth to the surface without need for fast and sustained erosion.
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Conference papers
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Contributor : Isabelle Dubigeon <>
Submitted on : Tuesday, July 19, 2011 - 2:11:42 PM
Last modification on : Thursday, June 18, 2020 - 12:46:02 PM

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  • HAL Id : insu-00609562, version 1

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Laurent Husson, Jean-Pierre Brun, Philippe Yamato, Claudio Faccenna. Episodic slab rollback makes it easy for HP rocks to be exhumed. European Geosciences Union General Assembly 2010, May 2010, Vienne, Austria. pp.EGU2010-2753. ⟨insu-00609562⟩

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