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- W2014226298 abstract "The Ordenes Complex, Galicia, NW Spain, preserves high-pressure, moderate-temperature metamorphism in continentalmargin rocks subducted during closure of the Rheic Ocean in the Variscan orogeny. The exposures extend across c90 kmperpendicular to strike and include rocks that reached depths of 30 to 60 km. Estimates of P–T conditions of rocks found nearthe boundary between overriding and subducting plates range from 430 8C at 1.0 GPa to 520 8C at 1.65 GPa. Structuralreconstructions including these data indicate an angle of subduction between 15 and 308.A mathematical solution and numerical models have been used to estimate shear heating experienced by this well-exposedpaleo-subduction zone. Best fit of model to thermobarometric results occurs if shear stress in the upper reaches of the faultseparating subducting and overriding slabs was c100 MPa (constant shear) or c10.0% of pressure (constant coefficient offriction) assuming a convergence rate of 6 cm year 1. At greater depths negative feedback between temperature and shear stresscaused the system to approach steady state with decreasing shear stress and with little increase in temperature. The decrease inshear stress at temperatures above 400 8C occurs as the rheological properties of the rock at higher temperature and (or) pressureallow more plastic behavior. This suggests that high-temperature metamorphism is unlikely to occur in subducting crust withoutspecial circumstances. A comparison of these results with estimates of shear stress inferred from seismicity and heat flow atactive convergent boundaries in the Pacific indicates that shear stress is best described as a pressure-dependent variable not as aconstant shear stress." @default.
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- W2014226298 date "2005-03-01" @default.
- W2014226298 modified "2023-10-16" @default.
- W2014226298 title "Shear stress in subducting continental margin from high-pressure, moderate-temperature metamorphism in the Ordenes Complex, Galicia, NW Spain" @default.
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- W2014226298 doi "https://doi.org/10.1016/j.tecto.2004.11.009" @default.
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