The Numidian of Sicily revisited: a thrust-influenced confined turbidite system. (December 2016)

• Record Type: Journal Article
• Authors: Pinter, Patricia R.; Butler, Robert W.H.; Hartley, Adrian J.; Maniscalco, Rosanna; Baldassini, Niccolò; Di Stefano, Agata
• Is Part Of: Marine and petroleum geology. Volume 78(2016:Dec.)
• Page Start: 291
• Page End: 311
• Publication Date: 2016-12
• Subjects: Numidian system -- Confined turbidites -- Active basin -- Facies variations; Submarine geology -- Periodicals; Petroleum -- Geology -- Periodicals; Géologie sous-marine -- Périodiques; Pétrole -- Géologie -- Périodiques; Petroleum -- Geology; Submarine geology; Periodicals; Electronic journals; 551.468
• DOI: 10.1016/j.marpetgeo.2016.09.014
• Languages: English
• ISSNs: 0264-8172

Abstract

Abstract: Understanding whether a system was unconfined, and deposited on a relatively unstructured basin-floor, or was confined by actively deforming substrate is important for the prediction of turbidite stratigraphy. Here we consider the Numidian turbidite system (Oligocene-Miocene) of Sicily - for many the type example of thick structureless submarine sandstones. New mapping and detailed sedimentology in the Nebrodi and Madonie Mountains (northern Sicily), allied to existing and new biostratigraphic data, challenge conventional interpretations for the Numidian system as a whole. Rather than having been deposited within an unstructured foredeep by relatively unconfined flows, we show that Numidian deposition was confined by active structures. These governed the routing of turbidity currents to create sand fairways and associated facies variations. The controlling structures include thrust-related folds together with inherited basin-floor faults. Existing models suggest that facies variations between adjacent outcrops on Sicily (and elsewhere) result from long-range stratigraphic variations being juxtaposed by later large-displacement thrusts. Our research reveals a much simpler tectonic structure but a more complex stratigraphic arrangement for the Numidian on Sicily - a characteristic of confined turbidite systems. Highlights: New mapping, sedimentology and biostratigraphy data for Numidian of northern Sicily. Numidian turbidite system of northern Sicily is Burdigalian in age. Numidian system confined by active thrusts and inherited structures. System shows short-range facies variations related to confining basin geometry. Degree of post-Numidian thrust disruption in N Sicily previously over-estimated.