ABSTRACT

We studied the mylonitic granodiorites belonging to the Symvolon pluton from the Kavala Shear Zone (Rhodope Massif, NE Greece), to determine strain rates and refining the tectonic exhumation model of this area. With this purpose, we combined a quantitative microstructural analysis with an image assisted thermodynamic modelling. In particular, three samples exhibiting increasing stages of deformation were selected to estimate PT conditions of the mylonitic event by means of a quantitative mineral-chemical study realized via statistical data handling of X-ray maps. Obtained PT constraints were then used in conjunction with quartz paleopiezometry combined with flow laws, to estimate the amount of mean strain rate achieved during the shearing evolutionary stage of these rocks. Such multifaceted approach allows us to infer strain partitioning and pluton cooling rate during the mylonitic evolution, obtaining an average strain rate of 7.5 * 10-12 (s-1).

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