Thermal history and exhumation of the Northern Apennines (Italy): Evidence from combined apatite fission track and vitrinite reflectance data from foreland basin sediments

Abstract

Apatite fission track ages of 20 samples collected from turbidite successions deposited in, foreland basins adjacent to the Northern Apennines range between Ο3 and Ο10 Ma. The youngest fission track ages are concentrated in a NW-SE elongated belt, which approximately runs through the centre of the study area, while gradually increasing ages are distributed towards the south-western and north-eastern borders. Integration of apatite fission track data and published vitrinite reflectance values indicate this region of the Apennines experienced continuous but variable exhumation starting from Ο14 Ma. The extent of exhumation and uplift range between 5 and 6 km at the south-western and north-eastern borders of the study area, and Ο7 km in the central part. Exhumation was driven mainly by erosion, with minor faulting in response to structural readjustment related to differential exhumation. Regional exhumation and erosion are interpreted as the result of isostatic rebound following crustal thickening in the lower part of the orogen.