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• W2003600923 abstract "Abstract The Western Iratsu body of the Sanbagawa belt (SW Japan) represents a P )–temperature ( T ) path and the evolution of the associated mineral assemblages. Microstructural observations combined with calculated pseudosections reveal two distinct stages of subduction-related metamorphism referred to as M1 and M2. P – T conditions of M1 evolved from 0.9 GPa, 570 °C to 1.2 GPa, 660 °C, implying relatively high thermal gradients possibly developed shortly after the initiation of subduction. The available age data and the characteristics of the P – T path suggest that the Western Iratsu body was detached from the slab at 1.2 GPa (~ 40 km depth) and the subsequent subduction occurred at a very slow rate due to weak mechanical coupling to the downgoing slab. The prograde metamorphism associated with the second subduction phase (M2) reached the eclogite facies (~ 1.8 GPa, 510–560 °C), but mafic rock compositions recrystallized into either eclogite or garnet–epidote amphibolite assemblages, depending on the bulk rock (CaO + Na 2 O)/(FeO + MgO) ratio. The thermal peak of M2 (~ 620 °C at 1.6 GPa) was attained during the early phase of exhumation. Further decompression and re-equilibration (M3) took place in the epidote-amphibolite facies. The M2 to M3 P – T evolution is associated with a progressive increase in thermal gradient ( T / P ratio), which can be explained by thermal modeling as the result of the inflow of a very young hot section of the slab. The bulk density of the whole Western Iratsu body at the point of onset of exhumation—the return point—is estimated to be ~ 3180 kg m − 3 , which is less than the density of mantle, implying that buoyant rise is a viable mechanism for its initial exhumation. Buoyant rise is in accordance with the widespread early-exhumation related deformation that has a dip-parallel stretching lineation. Exhumation of the buoyant discrete mafic slice along the decoupled slab–mantle interface could have been triggered by the heating that lead to fluid liberation and a resultant reduction of the rock strength." @default.
• W2003600923 created "2016-06-24" @default.
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• W2003600923 date "2012-08-01" @default.
• W2003600923 modified "2023-10-18" @default.
• W2003600923 title "Slow subduction and buoyant exhumation of the Sanbagawa eclogite" @default.
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• W2003600923 doi "https://doi.org/10.1016/j.lithos.2012.05.010" @default.
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