
handle: 20.500.14243/224012 , 11573/44099
Most of the ancient turbidite systems are known being deposited in foredeep basins at the front of active thrust belt. Differently from fluvio-deltaic systems generally lacated in the more internal portion of these basins, the turbidite systems occur at different depth in the more deeper portions of these basins (foredeep turbidite systems) or in the relatively shallower tectonically confined depressions occurring on top of the thrust belt (wedge-top turbidite systems) (see discussion in Mutti et al. 2002, 2003). Foredeep turbidite systems represent the classical sedimentation in a broad and flat basin plain, showing thick to thin parallel and continuous sandstone beds with the Bouma-type depositional division. Wedge-top turbidite systems are directly fed by fluvio-deltaic systems and more clearly record both climate changes affecting the source areas and tectonic activity of the orogenic wedge. Messinian turbidite deposits of the northern and central Apennines show many characters indicating sedimentation in confined basins, formed since the upper Tortonian in relation to the segmentation of the Langhian-lower Tortonian Marnoso- Arenacea foredeep basin (inner stage of the Marnoso-Arenacea, Ricci Lucchi, 1986). In these last years, detailed facies and physical stratigraphic analyses as a well as structural and thermal analyses, conducted on the Laga and Argilloso-Arenacea Fms (central Apennines), demonstrate as these basins were located at the hinge between foredeep and wedge-top depozones of the Messinian Apennine thrust belt (Milli and Moscatelli, 2000, 2001; Bigi et al., 2003; Moscatelli, 2003; Milli et al., 2004; Falcini et al., 2006; Stanzione et al., 2006; Casero and Bigi, 2006; Aldega et al., 2006; Critelli et al., 2007; Milli et al., 2007). Anisotropy of the subducted plate and thrust propagation rate deeply controlled the onset of complex basins at the top of the orogenic wedge (Casero and Bigi 2006; Bigi et al., 2006). The resulting topography of these basins and the concomitant climate changes exerted a strong control on turbidite sedimentation and on the stratigraphic organization of these deposits.
Laga Basin, central Apennines, EAGE 2008, excursion guidebook
Laga Basin, central Apennines, EAGE 2008, excursion guidebook
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