Istituto di Geoscienze e Georisorse     
Montanari D., Corti G., Simakin A. Magma chambers and localization of deformation during thrusting. In: Terra Nova, vol. 22 (5) pp. 390 - 395. Wiley, 2010.
We present the results of coupled analogue and numerical models that provide new insights into the relationships between volcanoes and thrusts. The effects of both upper-crustal magma chambers and the load of volcanoes on the geometry of thrust systems were investigated. Analogue modelling points to a strong influence exerted by a magma chamber on thrust geometry, which, as suggested by the numerical models used to rationalize these results, is related to the stress redistribution around the weak heterogeneity. The low-viscosity body below a volcanic edifice localizes compressional deformation and causes a curvature of the thrusts towards the magma chamber, opposite to the direction of tectonic transport. In these conditions, the volcanic load has a negligible effect on the structural geometry. These results are in contrast with those of previous studies, where intrusions or the load of major volcanoes generated a curvature of the thrusts away from volcanic edifices in the direction of tectonic transport.
URL: http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1365-3121
Subject analogue modelling
granite emplacement
numerical modelling
structural geology

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