Late structural evolution in an accretionary wedge: insights from the Voltri Massif (Ligurian Alps,Italy) |
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| Abstract: | The Voltri Massif underwent a polyphasic tectono-metamorphic evolution that records both the Alpine and part of the Apennine deformation events. So this is a key-area to investigate the relationships between Alpine and Apennine deformation events. This paper focus on the upper crustal deformations (UCD) that characterize the last stages of the tectonics of the Voltri Massif. In the Voltri Massif UCD are characterized by the superpositions of ductile, brittle-ductile and brittle structures that can be attributed to three main tectonic events (from D3 to D5). The oldest UCD event (D3) developed folds and reverse shear zones under ductile to brittle-ductile conditions. Main compressive NW-SE oriented regime characterized D3 event. Brittle-ductile to brittle reverse shear zones and important strike-slip/transpressive systems overprinted D3 structures. This D4 event was significant at the regional scale and occurred under main transpressive, NE-SW oriented, regime. The latest normal and transtensional brittle structures, that formed during UCD D5 event, locally reactivated the older structures. |
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| Keywords: | transpressive system shear zones Ligurian Alps Voltri Massif |
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