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The exhumation of high-and ultrahigh-pressure metamorphic terranes in subduction zone:Questions and discussions

Science China Earth Sciences 2020年第12期63卷 1884-1903页

作者： Lifei Zhang Yang Wang MOE Key Laboratory of Orogenic Belts and Crustal Evolution School of Earth and Space SciencePeking UniversityBeijing100871China

In terms of petrology,thermomechanical simulation is an important frontier to study the geodynamic process of the exhumation and uplift of high pressure(hp)to ultrahigh pressure(uhp)metamorphic rocks in subduction zones and collision orogenic *** on the recent petrological studies and numerical modellings for the exhumation of hp to uhp metamorphic terranes,the exhumation mechanisms of hp to uhp metamorphic terranes can be roughly summarized into ten types:channel flow,diapiric exhumation,a coexistence mechanism of channel flow and diapiric exhumation,slab breakoff,multi-stage exhumation,divergent plate motion(including slab rollback and the upper-plate divergent motion away from the subducted plate),overthrust exhumation,overpressure mechanism,wedge-like extrusion and microplate *** exhumation of high-density uhp oceanic eclogites is a relative controversial *** of our recent researches on quantitatively determining the exhumation mechanism of uhp oceanic eclogites using thermomechanical and phase equilibrium modelling was introduced in details in this *** obtained the 3-D density evolutions of three-type subducted oceanic materials(MORB,serpentine and oceanic sediments)in P-T space by the methods of phase equilibrium and density *** to the density difference between the metabasic and their surrounding rocks,the exhumed eclogites could be divided into two *** first category,the self-exhumation eclogites(ρ_(MORB)ρmantle),which can only be carried back to the surface with the assistance of low-density metasediments and serpentinite due to their negative buoyancy;the coesite-bearing uhp eclogites of Zermatt-Saas in the Western Alps is a typical ***,we further explored the ultimate self-exhumation depth,exhumation mechanism

关键词： hp-uhp metamorphism Exhumation mechanisms Eclogite Density Subduction zone

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