Detrital events within pelagic deposits of the Umbria-Marche Basin (Northern Apennines, Italy): further evidence of Early Cretaceous tectonics

• DOI: 10.3304/jmes.2016.003
• Publication Date: 2016-10-04
• Authors: Simone Fabbi; Paolo Citton; Marco Romano; Angelo Cipriani
• Keywords: Carbonate platform; Pelagic sediment; Aptian; Extensional tectonics; Ammonite

Re-sedimented deposits characterize different stratigraphical intervals in the pelagic successions of Umbria-Marche-Sabina Domain (Central and Northern Apennines, Italy). Three stratigraphic sections Maiolica Marne a Fucoidi Formations, characterized by breccias calcarenites embedded sediments, have been sampled across Mt. Primo area (Umbria- Marche Ridge, Apennines). Facies analysis indicates gravity-driven origin for clastic levels, interpreted as debris-flows, or turbidity flows. The massive lensoid-to-tabular levels are composed loose shallow-water benthic material, sourced from an unknown carbonate platform, associated with: I) lithoclasts made Lower Jurassic Cretaceous carbonates; II) mudstones wackestones referable to succession; III) calpionellid/radiolarian-rich soft pebbles (Maiolica-type facies). compositional features studied detrital imply submarine exposure dismantling portions succession older than Barremian/Aptian, which had be buried late Early Cretaceous. Such evidence led us refer investigated event extensional tectonic phase. Our interpretation well fits with data coming others geological settings Italy, strongly suggesting occurrence widespread phase