The marine Gilbert-type fan deltas of the Pliocene-Holocene Crati Basin (southern Italy) preserve evidence for distinct tectonic control on their development. Syndepositional faults characterized by high rates of vertical motion produced steep coastlines and segmentation of the basin into sub-basins protected from strong longshore and tidal currents. These morphologic conditions, similar to those occurring in fjords, triggered the development of deltaic foreset beds and their extensive progradation. The style of motion of the syndepositional faults controlled the architecture of both the individual fans and the basin infill. In the extension-dominated sector of the Crati Basin, Gilbert-type fan deltas occur as individual fans and show a simple delta foreset unit. In the strike-slip-dominated sector, Gilbert-type fan deltas occur as stacked sequences and commonly show a composite delta foreset unit reflecting persistent large-scale faulting events and repeated source-area uplift and basin-floor subsidence.

First Page Preview

First page PDF preview
You do not currently have access to this article.