The Laga Basin: stratigraphic and structural setting

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