Lithostratigraphy and structural setting of the Inzecca Unit (Schistes Lustrés Complex, Alpine Corsica, France): clues from the Venaco-Altiani area

The structural map of Venaco-Altiani area features a well-preserved transect across the Alpine Corsica, ranging from the deepest structural level of the Schistes Lustrés Complex represented by the Upper Castagniccia and Morteda-Farinole Units, to the Inzecca Unit. Especially it provides an uninterrupted exposure of the Inzecca Unit, allowing the complete reconstruction of its lithostratigraphy and tectonic setting. It comprises high-pressure/low-temperature metamorphic ophiolites, which are overlain by a thick composite sequence of metasediments ranging from the Late Jurassic to the Late Cretaceous. From bottom to top, these include the metaradiolarites, Erbajolo, Petraggiolo and Bagliacone-Riventosa Formations. The latter two consist of siliciclastic and carbonatic metaturbidites that were deposited on top of the oceanic crust of the Ligurian-Piedmont basin. To the W, the Schistes Lustrés Complex is bounded by Hercynian Corsica via N–S trending strike-slip faults. All the mapped tectonic units were affected by Alpine deformation and metamorphism.