Data di Pubblicazione:
2014
Abstract:
The area covered by the geological map “Foglio 378 Scanno” is located in the central sector of the Apennine chain. It includes the NE sector of the “Marsica” region (Almagià, 1910) and the western part of the Peligna valley. The northern part of the “Abruzzo, Lazio e Molise” National Park and a small portion of the “Majella” National Park are also included in the study area.
The geography of the area is typified by NW-SE and N-S trending ridges, divided by narrow valleys. The height of the ridge is around 1800 m asl., with highest peaks exceeding 2200 m. asl. This gives the region an overall high relief that is contrasted with relative low plains along the boundaries of the study area.
From the geological point of view, the area is located in the axial sector of the Apennines. A thrust belt started developing in the Neogene, following an arch geometry that reflects the complexity of the deep structures, which is still not well understood and debated. The thrusts and folding stacked one over each other successions, belonging to different paleogeographical domains. Since the Late Miocene, and throughout the Pleistocene, the area experienced regional uplift and extensional faulting, driving the initial phases of morphogenesis. This map area shows a complex stratigraphic setting, having witnessed several different sedimentary environments throughout the Mesozoic and the Cenozoic.
Based on the sedimentary environment and in respect of the main tectonic events occurred in the area, stratigraphic successions can be divided into:
- Pre-orogenic Meso-Cenozoic marine successions;
- Syn- and late-orogenic Neogene marine successions;
- Post-orogenic Quaternary continental successions.
Each of these successions are complicated and have been further described.
Sediments related to a carbonate platform, slope, and pelagic basin environment, influenced by the detritic discharge coming from the reef are grouped as Pre-orogenic successions. Lithologies related to these environments out-crop in the area in well defined sectors, bounded by main tectonic elements and divided from one another by narrow corridors of syn-orogenic deposits. The outcrops are then highly partitioned and, as a result, the reconstruction of the relationship between the different environments is very difficult to determine and is often impossible.
Moving roughly perpendicular to the structures, in a SW-NE direction, inner carbonate platform sediments are at first encountered in the mountains on the western edge of the map, from the Fucino plain to the Pescasseroli area.
These carbonates present monotonous features, on a span of time that extends from the Triassic(?) - Lower Jurassic to the Upper Cretaceous. These are unconformably overlain by miocenic calcarenites, which are related to the carbonate ramp environment.
Moving to the NE, within the central part of the area, the “Montagna Grande” ridge is dominated by detritic and reef related deposits which extend from the Lower - Middle Jurassic to the Upper Cretaceous. Although some big facies variations are recognized in the stratigraphic series, the main features remain constant throughout the entire time span. On the eastern flank of the ridge some sediments that are related to a more distal and deep-sea environment crop out.
Slope to basin sediments crop out largely on the NE quadrangle, on the “Mt. Genzana – Serra Sparvera” ridge. They span from the Lower Jurassic to the Paleogene. Micritic, thin bedded, mudstone are interbedded within thick bedded, detritic, limestone, denoting the strong influence that the carbonatic slope still exerted on this area. In this quadrangle, carbonatic ramp calcarenites, Miocene in age, lie unconformably on different formations of the pelagic sequenc
The geography of the area is typified by NW-SE and N-S trending ridges, divided by narrow valleys. The height of the ridge is around 1800 m asl., with highest peaks exceeding 2200 m. asl. This gives the region an overall high relief that is contrasted with relative low plains along the boundaries of the study area.
From the geological point of view, the area is located in the axial sector of the Apennines. A thrust belt started developing in the Neogene, following an arch geometry that reflects the complexity of the deep structures, which is still not well understood and debated. The thrusts and folding stacked one over each other successions, belonging to different paleogeographical domains. Since the Late Miocene, and throughout the Pleistocene, the area experienced regional uplift and extensional faulting, driving the initial phases of morphogenesis. This map area shows a complex stratigraphic setting, having witnessed several different sedimentary environments throughout the Mesozoic and the Cenozoic.
Based on the sedimentary environment and in respect of the main tectonic events occurred in the area, stratigraphic successions can be divided into:
- Pre-orogenic Meso-Cenozoic marine successions;
- Syn- and late-orogenic Neogene marine successions;
- Post-orogenic Quaternary continental successions.
Each of these successions are complicated and have been further described.
Sediments related to a carbonate platform, slope, and pelagic basin environment, influenced by the detritic discharge coming from the reef are grouped as Pre-orogenic successions. Lithologies related to these environments out-crop in the area in well defined sectors, bounded by main tectonic elements and divided from one another by narrow corridors of syn-orogenic deposits. The outcrops are then highly partitioned and, as a result, the reconstruction of the relationship between the different environments is very difficult to determine and is often impossible.
Moving roughly perpendicular to the structures, in a SW-NE direction, inner carbonate platform sediments are at first encountered in the mountains on the western edge of the map, from the Fucino plain to the Pescasseroli area.
These carbonates present monotonous features, on a span of time that extends from the Triassic(?) - Lower Jurassic to the Upper Cretaceous. These are unconformably overlain by miocenic calcarenites, which are related to the carbonate ramp environment.
Moving to the NE, within the central part of the area, the “Montagna Grande” ridge is dominated by detritic and reef related deposits which extend from the Lower - Middle Jurassic to the Upper Cretaceous. Although some big facies variations are recognized in the stratigraphic series, the main features remain constant throughout the entire time span. On the eastern flank of the ridge some sediments that are related to a more distal and deep-sea environment crop out.
Slope to basin sediments crop out largely on the NE quadrangle, on the “Mt. Genzana – Serra Sparvera” ridge. They span from the Lower Jurassic to the Paleogene. Micritic, thin bedded, mudstone are interbedded within thick bedded, detritic, limestone, denoting the strong influence that the carbonatic slope still exerted on this area. In this quadrangle, carbonatic ramp calcarenites, Miocene in age, lie unconformably on different formations of the pelagic sequenc
Tipologia CRIS:
7.1 Curatela
Elenco autori:
D'Alessandro, Leandro; Miccadei, Enrico
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