This work reconstructs the evolution of a source-to-sink system in a transpressional setting from compositional changes within its deep-water clastic offshoots. Field-based clast counts on 10 conglomerate beds of three transects, combined with petrographical and mineralogical (XRD) analyses on 14 samples, have been used to integrate the already-existing large dataset developed during more than 60 years of study on the Como Conglomerate (the base of the Gonfolite Lombarda Group, Chattian to Aquitanian – Northern Italy). The results shed a new light on the terranes involved in the production of sediments and further constrain the evolution of the fluvial drainage in response to the Cenozoic Adria indentation during the post-collisional phases of Alpine orogeny. In particular, it has been possible to track-back the steps during which paleorivers were connected, and later disconnected, with the basin due to the Oligo-Miocene activity of the right-lateral Periadriatic Fault System (PFS). During its transpressive movement, accommodating the Adria westward indentation, the PFS cumulated a total displacement increasing from ca. 20 km to the west, up to ca. 60 km, to the east. The results of this study also constrain the post-depositional kinematics of the clastic wedge, which was progressively rotated clockwise and thrust to its present-day position, onto the Southalpine Mesozoic sequence. This model represents a fundamental step forward in the comprehension of how tectonic indentation interacts with surface source-to-sink systems, and demonstrates that tectonic induced connections/disconnections of fluvial systems are as fundamental as exhumation processes in the transfer of sediments from source to sink areas.

Di Capua, A., Pandini, R., Barilaro, F., Cavallo, A., Livio, F. (2022). Drainage pattern evolution during continental indentation in Central Alps: Constraints from the sedimentary record of associated deep-water clastic offshoots. MARINE AND PETROLEUM GEOLOGY, 144(October) [10.1016/j.marpetgeo.2022.105846].

Drainage pattern evolution during continental indentation in Central Alps: Constraints from the sedimentary record of associated deep-water clastic offshoots

Di Capua, Andrea
;
Cavallo, Alessandro;
2022

Abstract

This work reconstructs the evolution of a source-to-sink system in a transpressional setting from compositional changes within its deep-water clastic offshoots. Field-based clast counts on 10 conglomerate beds of three transects, combined with petrographical and mineralogical (XRD) analyses on 14 samples, have been used to integrate the already-existing large dataset developed during more than 60 years of study on the Como Conglomerate (the base of the Gonfolite Lombarda Group, Chattian to Aquitanian – Northern Italy). The results shed a new light on the terranes involved in the production of sediments and further constrain the evolution of the fluvial drainage in response to the Cenozoic Adria indentation during the post-collisional phases of Alpine orogeny. In particular, it has been possible to track-back the steps during which paleorivers were connected, and later disconnected, with the basin due to the Oligo-Miocene activity of the right-lateral Periadriatic Fault System (PFS). During its transpressive movement, accommodating the Adria westward indentation, the PFS cumulated a total displacement increasing from ca. 20 km to the west, up to ca. 60 km, to the east. The results of this study also constrain the post-depositional kinematics of the clastic wedge, which was progressively rotated clockwise and thrust to its present-day position, onto the Southalpine Mesozoic sequence. This model represents a fundamental step forward in the comprehension of how tectonic indentation interacts with surface source-to-sink systems, and demonstrates that tectonic induced connections/disconnections of fluvial systems are as fundamental as exhumation processes in the transfer of sediments from source to sink areas.
No
Articolo in rivista - Articolo scientifico
Scientifica
Conglomerate; Gonfolite lombarda group; Oligo-miocene; Paleo-drainage; Ultramafic detritus;
English
12
Di Capua, A., Pandini, R., Barilaro, F., Cavallo, A., Livio, F. (2022). Drainage pattern evolution during continental indentation in Central Alps: Constraints from the sedimentary record of associated deep-water clastic offshoots. MARINE AND PETROLEUM GEOLOGY, 144(October) [10.1016/j.marpetgeo.2022.105846].
Di Capua, A; Pandini, R; Barilaro, F; Cavallo, A; Livio, F
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/10281/389495
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