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SEDIMENTOLOGIA E TETTONICA DELLA SUCCESSIONE CLASTICA DELLA VAL MEDUNA (PREALPI CARNICHE, PN)

Authors: VENTURINI, CORRADO; Discenza, Katiuscia; Astori, Antonella;

SEDIMENTOLOGIA E TETTONICA DELLA SUCCESSIONE CLASTICA DELLA VAL MEDUNA (PREALPI CARNICHE, PN)

Abstract

Questo lavoro è centrato sull’analisi sedimentologica e tettonica dei depositi terrigeni di fondovalle a" oranti lungo il corso del Torrente Meduna, nel segmento vallivo compreso tra gli abitati di Tramonti di Sotto e Meduno (PN). L’area oggetto di indagine ha il proprio fulcro di massima esposizione ed interesse nel settore Col Ventous - Ponte Racli, collocato lungo il fronte esterno delle Prealpi Carniche. Nella potente successione clastica di fondovalle sono stati riconosciuti due distinti litosomi (Conglomerato di Case del Bianco e Conglomerato di Ponte Racli), parzialmente coperti da recenti depositi  uvio-glaciali (Subsintema di Arba, Sintema di Sequals) e discordanti sopra un substrato mesozoico-paleogenico già intensamente deformato. Il Conglomerato di Ponte Racli è quello che o re le migliori potenzialità di studio, tanto sedimentologico quanto tettonico. Il litosoma è formato da ripetizioni cicliche di sequenze  uvio-deltizio-lacustri (>100 m di spessore), organizzate in successione continua, quasi priva di super€ ci d’erosione interna ed ottimamente esposta nel tratto occidentale del nucleo oggetto di studio (Col Ventous). Al contrario, la porzione orientale dello stesso (Ponte Racli) registra una serie di evidenti deformazioni gravitative legate all’attività di faglie sin-sedimentarie ben decifrabili in a" oramento. La successiva riattivazione in transpressione sinistra di alcune tra queste strutture ha generato un’inversione tettonica. In€ ne, in mancanza di reperti paleontologici e datazioni radiometriche, i dati tettonici e sedimentologici del Conglomerato di Ponte Racli sono stati utilizzati quali indizi indiretti per tentare di assegnare un’età alla deposizione dell’unità. Ne è scaturita una retro-datazione del litosoma, qui riferito genericamente all’intervallo Miocene sup. (tardo Messiniano) - Pliocene s.l., in luogo della sua collocazione quaternaria (Pleistocene sup.) ammessa, sempre su basi indiziarie, dagli Autori precedenti. The study concerns the sedimentological and tectonical analysis of terrigenous valley  oor deposits outcropping beside the Torrent Meduna between the villages of Tramonti di Sotto and Meduno (PN). € e main interesting and best exposed area is in the Col Ventous-Ponte Racli stretch, located along the external front of the Carnic Pre-Alps. Two di erent lithosomes have been identi‚fied in the thick clastic stratigraphic succession of the Meduna Valley  oor (Case del Bianco Conglomerate and Ponte Racli Conglomerate); they are partially covered by recent  uvio-glacial deposits (Arba Subsyntheme, Sequals Syntheme) and unconformably rest on the strongly deformed succession of Mesozoic-Paleogenic age. € e Ponte Racli Conglomerate consists of repeated cyclic  uvial-deltaic-lacustrine sequences (>100 m thick) arranged in a continuous succession with few internal erosion surfaces and perfectly exposed in the western part of the study area (Col Ventous). On the opposite side, in the eastern part, Ponte Racli Conglomerate records several clear gravitational deformations linked to syn-sedimentary fault activity that is well legible in the outcrop. € The further left -transpressive reactivation of some of these structures leads to a tectonic inversion. Lacking palaeontological evidences and radiometric dating, the tectonical and sedimentological data of Ponte Racli Conglomerate have been used as indirect clues to tentatively assign an age to the lithosome. A retro-dating of the unit arises: instead of the Quaternary placing (Upper Pleistocene), as indicated on indirect basis by previous Authors, here it is located generically to the Upper Miocene (late Messinian) - Pliocene s.l. interval.

Country
Italy
Keywords

Prealpi Carniche, Tettonica sin-sedimentaria, Ambiente lacustre, Pliocene, Fase neoalpina.

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
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