Forebulge migration in the foreland basin system of the central?southern Apennine fold?thrust belt (Italy): New high?resolution Sr?isotope dating constraints

The Apennines are a retreating collisional belt where the foreland basin system, across large domains, is floored by subaerial forebulge unconformity developed due to uplift and erosion. This overlain diachronous sequence of three lithostratigraphic units made (a) shallow-water carbonates, (b) hemipelagic marls shales (c) siliciclastic turbidites. Typically, latter two have been interpreted regionally as onset syn-orogenic deposition in foredeep depozone, whereas little attention has given underlying unit. Accordingly, rate migration central-southern Apennine fold-thrust belt-foreland system constrained, so far, exclusively considering age hemipelagites turbidites, which largely post-date depozone. In this work, we provide new high-resolution ages obtained strontium isotope stratigraphy applied calcitic bivalve shells sampled at base first deposits overlying Eocene-Cretaceous pre-orogenic substratum. Integration our results with published data indicates progressive rejuvenation strata sealing towards outer portions belt. particular, linearly scales position analysed sites, pointing an overall constant velocity wave last 25 Myr.