Objective of this study is to reconstruct the geological evolution of the Corsica Basin-Tuscan Shelf area from the Eocene to Miocene; that is, during the last compressive Eocene-Oligocene phases and the beginning of the Miocene extension. The Corsica Basin-Tuscan Shelf area is part of the north Tyrrhenian Sea and is located between the Alpine Corsica and the westernmost part of the northern Apennines. The Corsica Basin represents the western part of the study area; it is separated from the Tuscan Shelf by a N-S elongated ridge, the Elba-Pianosa Ridge. The ridge is mainly subacqueous, but emerges at the Pianosa Island and has been drilled by two wells, Martina 1 and Mimosa 1. It is composed of Eocene to Oligocene sandstones and shales overlain by clastic Neogene deposits. Available data consist of detailed micropalaeontological analyses of the rock exposed in the Pianosa Island and Secche di Vada Ridge, stratigraphic, micropaleontologic and petrographic information from the Martina 1 and Mimosa 1 wells, industrial seismic lines, and three recent deep seismic lines (CROP-Mare project). The following evolution of the Corsica Basin-Tuscan Shelf area is proposed. During the early and middle Eocene the Corsica Basin and part of the Tuscan Shelf were interested by subsidence and a thick succession of siliciclastic strata were deposited. In the late Eocene the Corsica Basin and Tuscan Shelf were interested by a compressional event during which deformation of strata and some erosion occurred. This event was followed by new subsidence during which a thick Oligocene succession was deposited. In the uppermost Oligocene (late Chattian)-early Miocene (Aquitanian) a prominent unconformity is related to a new compressional event (I Apenninic phase). This event marks the end of the compressional regime in the Corsica Basin-Tuscan Shelf area. In late Burdigalian time the Corsica basin was interested by a rift phase and developed as a half-graben. Rifting occurred later (late Serravallian) farther east in the Tuscan Shelf.
|Titolo:||Eocene-Miocene evolution of the north Tyrrhenian Sea|
|Appare nelle tipologie:||1.1 Articolo in rivista|